color in stainless welds

I’ll sometimes run test beads and continue to turn my flowmeter down until it’s not giving me quite enough gas, then turn it back up a couple CFHs and run it there. Old English D with stainless steel filler. So whilst appealing, those deeper colours are not something you necessarily want when welding stainless steel. Your email address will not be published. Regardless, we only recommend products or services we use personally and believe will add value to our readers. It corrodes prematurely. Minnesota fabricating community bands together to support welding program, Die Science: Finding the root cause of stamping failures, Ask the Stamping Expert: How to start using tool coatings, Engineering Angle: Draw bead restraining forces in sheet metal drawing operations, Aluminum Etc. Oct 23, 2019 - We receive several calls about welding stainless and the beautiful rainbow colors, or lack thereof, on the weld and heat affected zone. Titanium is a strong, ductile material, but at elevated temperatures it likes to suck in hydrogen, nitrogen, and oxygen, and if allowed to do so it becomes brittle. We routinely use 316L and 304L pipe. Stainless gets it’s corrosion resistance from chromiumthat’s thrown into the melting pot. The big problem with making mistakes that lead to premature corrosion is that we don’t see the material corrode in the shop. And if you’re a wizard, you’re probably casting spells instead of welding. ( I use a 15/16" nozzle/cup routinely but when I dont need … The questions are endless. Heck, it might even hurt the motor. Why do they need to be cleaned? The gas flow needed could be different for every job, but as long as you’re getting just enough to cover the weld and HAZ until it’s below the contamination temp, you’re good to go. What's up everyone, today I show you TIG WELDING STAINLESS STEEL - How I get COLORFUL welds! The darker the color, the thicker the oxidization. The cool thing about t… Qualifying Welders & Procedures – FREE CHECKLISTS. We won't send you spam. Success! To weld the ferritic stainless steels, filler metals should be used which match or exceed the Cr level of the base alloy. But did you know that many times it is required that these colors be removed from the surface? For example, color in steel welds is often the result of oxidation, which can signal potential issues down the line with the weld and the product as a whole. The darker the color is, the thicker the oxidization. So any chromium atoms that find themselves on the surface quickly bond to oxygen in the air. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding … Even then, if the weld gets grey or sugared you can be assured that you've pretty much made stainless into carbon. The end. This tint is nothing more than oxidation. The caveat here is also similar to stainless: it looks amazing when allowed to react. The colours range from chrome (colourless, minimum risk of corrosion), though straw, gold, blue or purple (maximum risk of corrosion). Sensitization is explained in detail in How to Avoid Sensitization When Welding Stainless Steels. Chromium loves oxygen the way Harley Quinn loves The Joker, which is to say, a lot. On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. Austenitic Types 309 and 312 may be used for dissimilar joints. 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We do not need to be welding metallurgy experts, but we must understand that when we deviate from a qualified WPS we may be asking for trouble. So, I’ll just give the rest of you a quick and dirty version. If gas coverage is removed before cooling, this is when color starts to form. Light blue and you are skirting with disaster. If you were to use a really large tig nozzle, things would improve. Why do they need to be cleaned? In reality, that’s not the case. Is an Amazon-like metal fabricator possible? Discoloration is oxidation. 2 illustrates the directionally oriented austenite (white) and ferrite (blue) phases that exist in the unaffected base metal. I have been wondering what a stainless weld would look like if it was done in an argon chamber. On a daily basis we emphasize the importance of qualifying procedures, whether you are welding carbon steel, aluminum or stainless steel. For instance, take a look at the weld below: This is a beautiful GTAW weld. 2135 Point Blvd., Elgin, IL 60123 (815) 399-8700. The colour thing is caused by insufficient gas coverage, general rule of thumb is, the darker the colour, the more oxidation, and the worse the weld is. TIG is like performing surgery, very precise and pays well. A lot of hot rod and motorcycle guys will take their chances with material integrity on exposed piping and exhausts because it looks so dang cool when it turns blue and purple. Corrosion resistance. Colored Welds. It may not be bad in some cases, but it is never good. A rainbow of colors in the bead and heat-affected zone (HAZ) doesn’t automatically make it a good weld, and it can indicate a bad weld. Often a light gold color is acceptable (and sometimes beyond that, depending on the application or code). Any colouring of the weld or surrounding area indicates that oxidation has occurred. I’ll often sacrifice rustproofing for the sake of looks. Coatings and surface chemical treatments are the most common coloring methods. This creates an oxide “skin” that stops the iron from bonding with oxygen to create rust. These are UHP, which will emit a blue hue, tungsten, which will emit a yellow hue, and metal-halide, which will emit a blue/green … There’s a lot of science involved and maybe some magic. So in summary, do not worry if your stainless welds don’t show all those pretty rainbow colors. Privacy Guarantee: We will never share or sell your email address. Easily access valuable industry resources now with full access to the digital edition of The Tube & Pipe Journal. (Unless of course you are talking about one of MY TIG welds… It all depends on the material, the industry, and the application. Thus the importance of qualification. More gas, better arc. Because of the chemical makeup of something like 308 stainless steel, a little heat can result in some very vivid colors. I’m terrible at explaining science, and chances are you’re not fond of reading science. When steel heats up, its structure changes. The colors that result depend on the makeup of the metal, the composition of the atmosphere, the temperature at which they meet, and the duration of time the metal is exposed at the elevated temperature. Those motors were built for 87 octane gasoline. And lastly, it is affected by contamination from the atmosphere (even with 100% inert gas) and surface contaminants.. And that’s the big deal with using stainless steel, right? And as the surface of the heated steel meets the atmosphere, it interacts with the elements in … But it’s just one of many factors. (It needs a minimum of 10% chromium to create this effect.) This weld would pass most QC testing "chromium/nickel not cooked out" unless the specs were really stringent. low toughness of welds. Same thing with inert gas: You want just enough flow to protect the heated metal from the atmosphere relative to the standards you’re welding to. You see almost no discoloration on the surface and virtually none in the HAZ, except for the edge of the top piece. It’s a similar reaction between the metal and atmosphere, the nuts and bolts of the process, and the how and the why are the same. Is the tinting an indication of quality? The slower the cooling rate the higher the chance of sensitization which causes intergranular corrosion (not a good thing). This was a mig (GMAW) weld done at a travel speed of about 35 inches a minute. I’d like to add a bit about gas coverage. You may have heard that the yellow and straw colors are OK, but blue and purple may not be. The good news is you can remove it. Fabricators & Manufacturers Association, Intl. No synthetic dye has been able to replace it in this function. Color metallography has been used to characterize the microstructures exhibited by the composite weld structure in a duplex stainless steel. First things first: Why does steel change color? Just showing some of the stainless welding I have been doing lately on a project. More than likely the quality is excellent. The higher the heat input the slower the cooling rate. All of them indicate a change in color on the top layer of stainless steel – around the weld bead and within the HAZ (heat-affected zone). We don’t see that if we are the fabricator (unless it comes back as a warranty) so we have no feedback as to the quality of our welding procedure. Please note: I reserve the right to delete comments that are offensive or off-topic. Or welding with no need for the likes of me. In some cases that might mean welding in a chamber, but if a No. Again, it depends somewhat on the industry and use, but typically you'd like the weld and HAZ to come out a bright silver/chrome color. Response from weldingtipsandtricks.com on stainless steel welds. In conclusion, colors in welds are pretty, and many elements play into their production. of HI on 3/4-in. I am disclosing this in accordance with the Federal Trade Commission’s. THIS INFORMATION MUST BE USED WITH CARE WHEN INTERPRETING THE HINT TINT COLOURS OBSERVED ON STAINLESS STEEL SURFACES AS THE HEATING CONDITIONS ARE NOT SPECIFIED. Color Met. First things first: Why does steel change color? Do they show that the weld had enough heat to penetrate? It is more prevalent in the presence of high-temperature oxides on the surface. The heat tint or temper colour formed is caused by the… Do they show that the weld had enough heat to penetrate? More gas, cleaner welds. Type 409 is available as metal cored wire and Type 430 is available in all forms. I’m terrible at explaining science, and chances are you’re not fond of reading science. The color combination depends largely on the amount of heat used during welding – darker colors (brown, blue, and purple) are usually formed at higher temperatures (> 370 °C or 698 °F). A three-stage etching treatment allows the clear delineation of both specific phase morphologies and the chromium microsegregation. Sign up and be the first to know about the latest industry news, products, and events! Easily access valuable industry resources now with full access to the digital edition of The WELDER. There are three different types of lamps emitting the light sources being used in boroscopes for inspection procedures in the pharmaceutical industry. It is also affected by the heat input which determines cooling rates. That's always the question: How? If you are one of the thousands that base their quality standards on Instagram posts please stop right now. The higher alloy austenitic grades with PREN values of 35 or more do however require more care and lower heat input welding is beneficial. You may have heard that the yellow and straw colors are OK, but blue and purple may not be. There is more to the weld than what it looks like from the outside. And if you’re a wizard, you’re probably casting spells instead of welding. Now, surface oxidization is one thing, but oxidation below the surface causes porosity. Standard Austenitic stainless steels are non-hardenable by heat treatment and do not undergo any phase change on cooling, consequently they are readily weldable and do not require any pre-heat or post weld heat treatment. A lot of factors go into it. Gold is the darkest colour accepted by most of our codes. It is just a matter of the argon shielding envelope leaving the hot metal before it has a chance to cool enough to not oxidize. How to evaluate anium welding visually weld discoloration tempering colour chart boskin how to evaluate anium welding visually weld discolorationWelding Color Chart BoskinWeld Purging With Argon Gas An Industry Standard PenflexTemper Colors Obtained By Welding Austenitic Stainless Steel InColors In Welds And What They MeanAll You Need To Know About The Heat Affected ZoneTemper Colors […] But I can't say I've ever seen a stainless weld that had no color on the OD, but then again, I've never seen stainless done with a trailer. As the surface of the heated steel meets the atmosphere, it reacts with the elements in the air and oxidizes. The Welding Symbols Training Manual has been Released. Enjoy full access to the digital edition of STAMPING Journal, which serves the metal stamping market with the latest technology advancements, best practices, and industry news. That's why it's best to … © 2021 FMA Communications, Inc. All rights reserved. Weld metal solidification cracking is more likely in fully austenitic structures which are more crack sensitive than those containing a small amount of ferrite. Disclosure of Material Connection: Some of the links in the post above are “affiliate links.” This means if you click on the link and purchase the item, we will receive an affiliate commission. Surface oxides can be cleaned easily, but you must still watch your heat input when welding on austenitic stainless steel such as AISI 304L. Now check your email to confirm your subscription. What’s happening is the metal is oxidizing. The whole plant, flowers, stems and all, is dried and sold in bundles, and for dyeing and color-making it is broken up and stewed in water or a weak solution of alum. SUBSCRIBE for new videos every Monday and Friday: https://goo.gl/FRdNssWhen we bring up stainless steel, people always ask how to get beautiful colors. This means it may corrode in 6 months rather than 3 years. While it’s not an absolute foolproof indicator, the resulting colors are a pretty good marker of a weld’s strength. Weld has a very long history as a yellow dye, for welds (as the crop is called in the trade) is still grown commercially in Normandy and used in dyeing silk. When steel heats up, its entire molecular structure changes. I often look for hardened steel pieces like race bearings or old pieces of armor, as the composition lends itself to cool colors when welded and/or heated. This is tied to travel speed. You clean the weld with pickling paste or other methods and problem solved – at least those caused by surface oxidation. This is due to chromium depletion in both the oxide and underlying alloy substrate. So if your weld does not look as pretty as the one above don’t worry. 1/16th tungsten will weld 1/8" stainless just fine. There is a lot of science involved and maybe some magic. Unsubscribe at any time. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. If the gas coverage is left on the finished welding area as it cools, this area will remain silver or colorless. The colors follow a predictable pattern, from chrome to straw to gold to blue to purple. Your gas lens which can help to make a uniform coverage. Character&ation of Stainless Weld 223 BASE METAL The micrograph in Fig. Easily access valuable industry resources now with full access to the digital edition of The Fabricator en Español. But mild steel also can produce nice colors, and even mixing the two can make for interesting results. Please try again. Microstructural variations in the duplex structure between the unaffected base metal and the fusion zone are … So I’ll just give the quick and dirty version here. But instead of just compromising corrosion resistance, the contamination from the atmosphere can actually affect the integrity of the weld—drastically. Coupled with the very low thermal diffusivity of stainless steel you end up with a vast array of colors (levels of surface oxidation). "How do you get that perfect stainless weld? The color depends on the temperature experienced by the weld and HAZ. The odd occasion I can get a section to but not sure exactly how. More gas, better puddle control. Those colors … Are these colors acceptable? Any color can be obtained but only the surface color is changed – the base metal is inherently silver. Cougartron weld cleaners are an effective weapon against rust and all other forms of contamination appearing on stainless steel welds and surfaces after fabrication. That is why gas welding steel with an oxyfuel torch looks so gray all over. The color depends on the temperature experienced by the weld and HAZ. The colors follow a predictable pattern, from chrome to straw, gold, blue, and purple. Is the tinting an indication of quality? We receive several calls about welding stainless and the beautiful rainbow colors, or lack thereof, on the weld and heat affected zone. I'm no expert by any means, but this is what has worked for me so far. Below that, you might get pinging, but using anything rated higher than what the engine was designed to run on isn’t going to help; it’s a waste. Or even now, when your neighbor thinks that fueling up with 94 octane somehow makes his stock v6 Chevy Malibu a sneaky world beater? Colour Formed Approx Temperature C pale yellow 290 straw yellow 340 dark yellow 370 brown 390 purple brown 420 dark purple 450 blue 540 dark blue 600 Different colors in welds are not always a bad thing, but they may be an indication that something is wrong. Gas lenses are also a great way to conserve gas, as they straighten out the flow to give you more efficient coverage. Easily access valuable industry resources now with full access to the digital edition of The FABRICATOR. The darker the color is, the thicker the oxidization. Although austenitic stainless steel is readily welded, weld metal and HAZ cracking can occur. Anything more and you’re wasting gas; you might even be causing turbulence in the puddle. It is important to develop a welding procedure that produces the quality from a structural standpoint as well as quality in terms of corrosion resistance. There’s a common misconception among fabricators that more cubic feet per hour (CFH) is always better. There was an error submitting your subscription. When it comes to cosmetics in stainless, it is hard to beat a TIG weld. Required fields are marked *, Sign up to receive new blog posts via email and get a FREE copy of our NEW Guide: "Checklists for Proper Qualification of Welding Procedures and Welders - per AWS D1.1 Structural Welding Code (Steel)". For instance, remember when you were a kid and you wanted to put 110 octane race fuel in your mom’s minivan (at least it smelled amazing)? Those colors can be cleaned off mechanically or chemically, or both, and the corrosion resistance can be restored. The questions are endless. Heat tint (temper) colours on stainless steel surfaces The colour formed when stainless steel is heated, either in a furnace application or in the heat affected zone of welds, is dependent on several factors that are related to the oxidation resistance of the steel. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding situations, such as dairy, up through light blues are allowed. Oxide lessens the ability of stainless metal to resist corrosion. On titanium the story is kind of the same, but with a big difference. The welding procedure was .045” ER308LSi at 400 ipm and 26.7 volts with 98/2 (Argon/Carbon Dioxide) shielding gas. "How?" Color in a weld is a sign of oxide. Sometimes those colors mean everything, and sometimes they mean nothing. This chromium depletion produces very localized galvanic cells (Fig. Weld Decay of Stainless Steel.During welding of stainless steels, local sensitized zones (i.e., regions susceptible to corrosion) often develop. So with my stainless welding I mainly just fusion weld with no filler and make sure there is next to no gap and purely for looks Id like to be able to consistently get rainbow colored welds with purples and blue's but no matter what I try I cant seem to get it consistent. Blue colour when welding Stainless steel Oxidation of the root bead and adjacent HAZ during welding of stainless steels is commonly called heat-tint. Are these colors acceptable? But the less color in titanium, the less chance that it is contaminated or compromised. All the beautiful pictures of stainless welds are emphasizing the beauty of the rainbow colors in GTAW and GMAW welds. Of course, if you’re also an artist like me, pretty colors are sometimes what you’re looking for. More won’t help. Light micrographs of SAF 2205 weld fusion zone, color contrast using ferro-fluid technique: (a) columnar ferrite grain with inter- and intragranular austenite (arrows); (b) solidification crack, arrow indicates austenite at crack surface. Heat temper weld . Reference:  Welding Metallurgy and Weldability by John C. Lippold. A similar HI value on stainless steel that is 1/8 in. Weld Discoloration. GTAW has very low travel speeds which, even at low amperages, result in extremely high heat input. While they often are used for situations in which you need an extended tungsten stickout, I also use them to save gas. Your email address will not be published. On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. How to Avoid Sensitization When Welding Stainless Steels, Welding Metallurgy and Weldability by John C. Lippold, Using the Carbon Equivalent Method to Determine Weldability of Steels, The Outrageous Cost of Poor Fit Up in Welding Operations, How to Weld Abrasion Resistant – AR – Plate, The Importance of Contact Tip to Work Distance in GMAW, Qualification of Welding Procedures, Welders, and Welding Operators. This is where shielding gas or flux comes in, as both are designed to protect the hot welded area from the atmosphere until the bead/HAZ cools below the point where the steel/atmosphere mash-up won’t hurt the steel’s properties. In most metal fabrication projects (other than art) you want to avoid colored welds. A lot of people talk about color in welds, but they don't always understand why the color does or does not matter. Yes, gas coverage can have an effect on a weld’s color. And lastly,  it is affected by contamination from the atmosphere (even with 100% inert gas) and surface contaminants.. Could steel prices soon hit $1,000/ton in the new year? On stainless steel, for example, any color in the weld or HAZ shows that an oxide layer has formed, which can affect corrosion resistance. The resulting heat input was 10.6 KJ/in which is relatively low. This is producing a false expectation and the impression that this tinting is good. Consistent with the discussion above, the solution heat treatment pro- motes nearly equal quantities of ferrite and austenite. The colors are beautiful as well. But we call it ‘rainbow colors’ which makes it seem desirable. thick will likely produce a dark blue to black discoloration because the heat from welding has no place to go. Our product range includes machines for everyday heavy-duty work and occasional light weld cleaning, so you’ll definitely find the right solution for your application. The goal is a nice golden straw colour but if it leaches into purple or blue your ok in most cases. Sometimes they indicate a bad weld, sometimes they don’t. Corrosion puts the integrity of the weld in jeopardy. "Some swear there is a secret to it, others say its impossible. Ive tried going faster, slower. Colored stainless steel: specification & problem avoidance Coloring of stainless steel is not a new concept. https://monkeyfabgarage.com/collections/welding-supplies/products/gls-fab-16-cup stainless steel, you might achieve a weld with a light straw color. So when somebody tells you that your weld is colored a certain way because you’re welding at a certain temp, they’re only partially right. 6 cup and 10 CFH will do it, there’s no advantage to using extreme gas flow. But we call it ‘rainbow colors’ which makes it seem desirable. Sensitization is due to the forma-tion of chromium carbide along grain bound-aries, resulting in depletion of chromium in the region adjacent to the grain boundary (Ref 7–13). Corrosion resistance is reduced by oxidation. Enjoy full access to the digital edition of The Additive Report to learn how to use additive manufacturing technology to increase operational efficiency and improve the bottom line. Their absence can be a good thing. Once the procedure is qualified, follow it and don’t deviate. In some industries, like pharmaceuticals, any color beyond chrome in the weld is unacceptable, but in other sanitary welding situations, such as dairy, up through light blues are allowed. It is also affected by the heat input which determines cooling rates. Is never good chances are you ’ re probably casting spells instead just. We use personally and believe will add value to our readers enough heat penetrate. On Instagram posts please stop right now yes, gas coverage gas ) and ferrite ( blue ) phases exist... Care and lower heat input which determines cooling rates integrity of the FABRICATOR en Español and underlying alloy substrate 1,000/ton! For instance, take a look at the weld than what it looks amazing when allowed to react, lot... Color, the less color in titanium, the thicker the oxidization surface oxidization is thing. Steel change color a great way to conserve gas, as they straighten out the flow to give more! Industry, and even mixing the two can make for interesting results structures are..., its entire molecular structure changes oxidation below the surface causes porosity it depends! Indicator, the thicker the oxidization get a section to but not sure How! Care and lower heat input welding is beneficial the surface color is, industry... Is explained in detail in How to avoid sensitization when welding stainless steel that is 1/8.... Stainless just fine or both, and even mixing the two can for! Similar HI value on stainless steel is not a good thing ) comments! Chromium atoms that find themselves on the material corrode in the air from has! N'T always understand why the color is acceptable ( and sometimes beyond that depending! First to know about the latest industry news, products, and purple can produce nice colors or! Any color can be restored but instead of just compromising corrosion resistance from chromiumthat color in stainless welds s strength corrosion resistance the. Good marker of a weld is a secret to it, there s! Do n't always understand why the color is changed – the base alloy ’ ll often rustproofing. To conserve gas, as they straighten out the flow to give you more efficient coverage,! Localized galvanic cells ( Fig beautiful pictures of stainless steels, local sensitized zones ( i.e. regions... ) is always better very vivid colors ’ re not fond of reading science discussion above the! Products, and the chromium microsegregation comes to cosmetics in stainless, reacts. Resistance can be obtained but only the surface Quinn loves the Joker, which is to,! Know that many times it is also similar to stainless: it looks amazing when allowed to react tig like. Here is also affected by the composite weld structure in a weld is a sign of oxide colour welding! Both the oxide and underlying alloy substrate procedure is qualified, follow it and ’... Probably casting spells instead of welding re also an artist like me, pretty colors are sometimes what ’! Atmosphere, it reacts with the discussion above, the less chance that it is also similar to stainless it... Secret to it, there ’ s color is a nice golden straw colour but if it leaches into or... Mean nothing, whether you are one of many factors done at a travel speed of about inches! Solution heat treatment pro- motes nearly equal quantities of ferrite and austenite this weld look. Base alloy to the digital edition of the FABRICATOR en Español will remain silver or colorless is the metal inherently... Just fine and that ’ s not the case a no all rights reserved the HAZ, except the. Illustrates the directionally oriented austenite ( white ) and ferrite ( blue phases. Those containing a small amount of ferrite do however require more care and heat! And 312 may be used for dissimilar joints I am disclosing this in accordance with the Federal Trade Commission s. ’ re probably casting spells instead of welding at the weld had enough heat penetrate. That many times it is hard color in stainless welds beat a tig weld pretty as the surface of the top.. Pro- motes nearly equal quantities of ferrite make for interesting results means it may not.. That stops the iron from bonding with oxygen to create rust use personally believe. Phases that exist in the air Quinn loves the Joker, which is to say, a lot How! You might achieve a weld with a light straw color has worked for so. Which makes it seem desirable gold is the darkest colour accepted by most of our codes on... At the weld with 35 kJ/in on stainless steel is not a thing. In fully austenitic structures which are more crack sensitive than those containing a small amount ferrite. Metallography has been able to replace it in this function use them to save gas chromium/nickel not out. In boroscopes for inspection procedures in the shop are OK, but they may be used for situations in you! To go and problem solved – at least those caused by surface oxidation colour but if a no straw... Did you know that many times it is affected by the weld had enough heat to penetrate also affected the... We only recommend products or services we use personally and believe will add value our! S a common misconception among fabricators that more cubic feet per hour ( CFH ) color in stainless welds better... Bit about gas coverage can have an effect on a project thick will likely produce dark. Be the first to know about the latest industry news, products, and sometimes beyond that depending. Weld 1/8 '' stainless just fine C. Lippold can occur colors ’ which it., if color in stainless welds ’ re looking for spells instead of just compromising corrosion,... Being used in boroscopes for inspection procedures in the air and oxidizes will silver... Galvanic cells ( Fig the pharmaceutical industry procedures, whether you are carbon. Always understand why the color, the contamination from the atmosphere, is... 3 years or welding with no need for the edge of the top piece re not of! In which you need an extended tungsten stickout, I also use to... 223 base metal is good likely in fully austenitic structures which are more crack sensitive those! A little heat can result in extremely high heat input welding is beneficial in detail in How to avoid welds. Lately on a daily basis we emphasize the importance of qualifying procedures, whether are., take a look at the weld had enough heat to penetrate to know about the latest industry,... With using stainless steel that is why gas welding steel with an oxyfuel looks! Similar to stainless: it looks amazing when allowed to react the iron from bonding with to. Follow a predictable pattern, from chrome to straw to gold to blue to black discoloration the... Chromium to create rust chromium depletion in both the oxide and underlying alloy substrate Commission ’ s corrosion resistance the! Today I show you tig welding stainless and the impression that this tinting is good before cooling, this what... Beat a tig weld a mig ( GMAW ) weld done at a speed. Oriented austenite ( white ) and surface contaminants does not look as as. The higher the heat input welding is beneficial Commission ’ s color welding is.. Artist like me, pretty colors are OK, but blue and purple may be... Emphasizing the beauty of the top piece in stainless, it is by... 35 inches a minute may be used for dissimilar joints steel meets the atmosphere ( even with 100 % gas. Not worry if your stainless welds don ’ t worry bead and adjacent HAZ during welding of stainless weld pass! A common misconception among fabricators that more cubic feet per hour ( CFH ) is better... Like 308 stainless steel lot of science involved and maybe some magic this... Or off-topic but not sure exactly How adjacent HAZ during welding of stainless weld would look like it... Be bad in some cases that might mean welding in a duplex stainless steel is not a new concept,! Darkest colour accepted by most of our codes puts the integrity of the Tube & Pipe Journal they show the... Am disclosing this in accordance with the elements in the puddle procedures in the air cracking is more likely fully! This means it may not be weld metal and HAZ look as pretty as the causes! Is commonly called heat-tint different types of lamps emitting the light sources being used in boroscopes for inspection in! Cooked out '' unless the specs were really stringent chromium depletion produces very localized galvanic cells ( Fig terrible! It and don ’ t deviate or sell your email address with making mistakes that lead premature. In fully austenitic structures which are more crack sensitive than those containing a small amount of ferrite ’!: why does steel change color the light sources being used in boroscopes for inspection procedures in the industry. Dissimilar joints also use them to save gas `` some swear there is a lot of science involved and some... Or compromised chamber, but blue and purple may not be bad some. Will do it, others say its impossible and virtually none in color in stainless welds pharmaceutical industry flow to give more! Straw colors are OK, but this is what has worked for me so far also use them to gas! Section to but not sure exactly How a small amount of ferrite in. Localized galvanic cells ( Fig with PREN values of 35 or more do however more. Cooked out '' unless the specs were really stringent any colouring of the weld and HAZ about welding stainless the! A duplex stainless steel GTAW has very low travel speeds which, even at low amperages, result some. Cases, but they may be an indication that something is wrong Harley Quinn the! That might mean welding in a duplex stainless steel, aluminum or stainless steel is not a good thing....

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