🔥 TIG Welding Stainless Steel for Beginners | TIG Time

welcome back to TIG time I'm mr. TIG today's episode is going to be one of three episodes and had a well stainless steel now first of all what is stainless steel what makes it different from steel well by definition its chromium content so if you have mild steel and you toss it about 12 percent chromium which makes it tougher and thus we have the stainless portion of it or corrosion resistance now you have stainless steel and it's actually easier to weld if you follow the instructions stainless steel defines real well in the puddle you can see the puddle real well you can define the dips of your adding the filler material that dabbing and just so you know there's so many different types of stainless steel we've come up with a chart for you and you can go on Welkom to get this chart now I happen to have it in front of me and I just wanted to define a couple of these stainless steels I mean there's a whole list of them we've got 304 stainless 310 316 we've got 321 stainless where does it end how do you select the material that you want to use for your application so we're going to start off with the most common stainless steel and the most common that you'll find is typically called a 304 stainless when you get ready to well 304 this chart will also tell you what filler to use and I'm just going to do a little cross section here and I'm getting ready to weld 304 to 304 the chart tells me to use 308 L filler material just so you know you can well mild steel to stainless steel and again just look at the chart and it'll tell you what filler to use now this is the first of three in the series so we're going to well 304 but we also want to do a little identification how do I know I've got stainless steel and sometimes out of the shop you have stainless and it maybe 304 stainless steel you're not a hundred percent sure but a good way of finding out is I've got two samples of material here I've got one it looks like it's stainless steel because it's a little bit shinier so one way to check is to take a magnet just a normal magnet and see if the magnet will pick it up and in this particular case the magnet doesn't pick it up so there's a good chance that this is stainless steel there's a lot of chromium in it now this may be stainless or you know what it may be mild steel let's check up it's mild steel so that's just a quick check there's there's all kinds of little checks that you could do one of them is you can you can grind the difference between the two and sometimes you can have a keen eye to see the different sparklers that come off but the magnet is usually the best one to use now one of the concerns I have in welding this material the chromium when you get it activated when you get a puddle what's going to happen is oxygen is going to try to attack it so with the TIG torch we have a gas lens this particular TIG torch I've got a gas lens a 1/16 tungsten sticking out about a quarter of an inch and that's going to be our standard so I've got good gas shielding I've got a part set up here and is tacked at both ends but I'm going to get good gas shielding here and as i weld I'm going to dab consistently when I finish the weld I'm going to turn the part over and you're going to see the penetration now if you put a purging or a gas back up to this penetration you're going to have an excellent looking weld on the backside if you didn't if you if you took shortcuts and you didn't put gas back up you're going to find that it wells a little more difficult and you're going to find oxides on the backside and these oxides will definitely shorten a life of your weld or if you're welding up one of your expensive exhaust parts for a race car or high-performance car or just about anything it's going to shorten the life so just want to let you know stainless steel has its place it's a great material it's actually easy to weld so we're going to get started and I'm going to run half of this plate without gas back up the second half I'm going to turn the gas back up on okay it initiates very cleanly you can see that puddle real shiny and I'm just having a little bit at a time I can see that I'm starting to penetrate and this particular well does not have gas back up so the likelihood is there's going to be a few oxides on the back side and we'll show those to you a little bit later at the top side typically will is pretty nice and I'm finishing the well reducing my amperage and making sure that the Creator does not fill too low and we're finished okay we've got our canoe Shi ation you can see the puddles forming it's nice and clean now this particular setup has purging on the backside meaning of argon gas so I actually get a little cleaner weld a little more control doesn't try to wander on the little dab filler so very stable very shiny and I'm going to finish up here shortly want me to make sure I don't leave a crater crack time I get a little extra filler right at the end you can see I'm only using like oh four or five diameter 308 L and I get the well termination and I pull out a puddle of amperage the last little s and I'm finished okay let's take a look at what we just did okay now this weld right here we added filler material we had argon on the TIG torch and we did not have purge gas on the backside and you'll probably notice there's kind of a burn line here it's kind of a dirty burn line if you move over to this weld we also had purge gas and torch gas at the same time it does have a burn line and we're going to cover that a little later how to get rid of that burn line but right now we're just comparing the difference between purging versus not purging your part okay now I'm going to turn the part over and this really is the telltale sign of whether you did it properly or not this was the the oxide sometimes you hear it described as brown sugar the backside did not wet out well at all so that be non-fusion and because you have these chromium oxides cracks are going to start forming and you're going to have a poor performance and your in your part whatever you're welding it could be an exhaust system it could be anything but it's not going to hold up as well as this right here this has perfect fusion and you can see that it wetted out very nicely now there's all kinds of ways of purging and we're going to continue those in section two and three of this well that's it for now thanks for watching take time I'm mister TIG

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