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304 SS exhaust system

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  • #16
    Originally posted by matt922 View Post
    very nice work. 18 gauge? Also, what kind of settings were you using?

    I'm sure the settings are more of a personal thing with tig, but i'm kind of new to welding, and this is the kind of stuff i want to do down the road.
    It was either 16ga or 18ga. I set the TIG to 80A (just a bit over 1A for 0.001" material thickness), no pulse and used some 0.030" 304 SS MIG filler wire. Just pull out what you need from the spool, cut and go!

    This system I used Solarflux to back the weld, it was a ton of work. Now I backpurge, costs quite a bit in gas but the labor saved makes up for it. Here's another system I built with the backpurge setup.


    Stainless Steel Dual Exhaust - Mint Design

    Or here is a stainless midpipe section that I did the welding on. Customer did all the cutting, I just prepped the surface and welded it.


    Stainless Midpipe Section - Mint Design

    The biggest piece of advice I have for SS welding is to get a piece of scrap, measure the thickness, figure out your 1A to 0.001" thickness and set your TIG welder to be 20% higher than that. That way it gives you some reserve if you need a bit more oomph, but you most likely be in the 60-80% range on your pedal anyways. Then lay some beads, lay some cold beads and lay some hot/overheated beads (terrible grey/black welds)...so you know what a bad weld looks like. Then work your way in between a cold and a hot bead to see what the proper heat input looks like. Ultimately you should try and make samples to destroy. I don't do much destructive testing anymore...but when I was first learning I welded up lots of scraps and tried to break all of them. Then I began doing non-structural stuff (artsy stuff) where the weld strength isn't critical at all. Over time when your confidence grows you can take on bigger projects. A lot of the stuff I'm doing is nothing compared to guys on here though!
    Thermal Arc 185TSW, Lincoln SP135+, 4-post automotive hoist, 2x media blast cabinets, 50 ton press, 80gal air compressor, 4-1/2"x6" bandsaw, 4'x4' Torchmate CNC table with plate marker, Hypertherm Powermax 65 plasma cutter, ultrasonic cleaning stations

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