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I'm planning to do my exhaust with Stainless Steel and after I spend some time practicing with SS and welding pipe I'll do the actual project. I wanted to get advice on how much gas I should get. I won't be doing any SS welding after the exhaust project is done, at least not in the foreseeable future. I don't want to have so much left over I'm sitting on the tank for months trying to use it up on something or just waste money bringing it back nearly full. I figured I'd rent a 40cf, or smaller tank if you think that's a lot more than I'll need, and pickup a 60-80cf for steel welding which is what I'd primarily be doing. Thanks in advance for your help and opinions.
Reply:Well, for mig, I use the regular 80/20 mix gas that I use on regular steel. Pure argon on ss with MIG will leave a very humped up weld, you will get better flow on the bead with a little co2 in the mix.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:The bigger the tank the cheaper to fill per pound/cf of gas. But if you only plan on doing your exhaust system i'd say go small, a 2.5' tall tank. Mine costs about $30ish to fill but I own it. If you plan on practicing first you may want to go bigger depending on how much practice you need. Nobody can really say.
Reply:It depends a bit on what size(s) your LWS/gas supplier has available.Went looking for a 40cf of tri-mix recently, LWS had 60cf instead.Yes you can most likely weld stainless with C-20 or C-25, but carbon pick-up from the CO2 will be big and will most likely change the stainless in the weld to not-really-stainless. Especially if you run a multipass bead. Unless you are somehow trying to weld a stainless with a lot of carbon in it, which usually isn't all that stainless though.More than about 5% CO2 in the gas will tend to put enough carbon into the weld bead that the metal is no longer stainless. Running 2.5% CO2 is usually pretty safe from the carbon pick-up aspect.Or run 99-1 or 98-2 Argon-O2.
Reply:Figure some extra gas for a back purge when doing stainless steel exhaust tubing. Without it, the insides of the pipe can get rather ugly due to what is commonly called "sugaring" (un-shielded oxidation of the heated inner portion of the tubing).Miller Millermatic 252Miller Syncrowave 200Liincoln AC-DC 225Victor O-A Set |
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发表于 2021-9-1 00:08:30