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Mig welding stainless steel

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#1 grannyknot


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Posted 17 November 2016 - 02:54 PM

I know how to mig weld carbon steels and my gas tank is 75% Argon 25% CO2 but I thought I would try my hand at welding together a new SS exhaust system for the Z. I have the ER308L stainless steel wire already, do I have to change the tank over to 98% Argon/2% CO2 or can I get by with the 75/25 ?



#2 winstonusmc


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Posted 17 November 2016 - 05:10 PM

Attached File  20161117_200848.jpg   92.21KB   1 downloads

Did this a couple monthes ago with 75% argon. Didn't turn out too bad.

'72 240z w/ RB25DE ITB MS3/MS3X


#3 theczechone


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Posted 30 November 2016 - 05:46 AM

I would just make sure to do a couple of test pieces, but you shouldn't have any trouble. 

My plan is to tack the exhaust together on the car and then take it to my buddy at work to tig weld it all together. 

'71 240z RB25det time attack project     :( 
'72 240z L28e w/ SUs, 5spd summer daily http://forums.hybrid...0z-hls30-50499/


#4 grannyknot


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Posted 30 November 2016 - 03:50 PM

I forgot about this thread, I went ahead using the 75/25 with SS wire, completely different animal then welding carbon steel, took some playing around to keep from blowing holes.


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#5 skirkland1980


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Posted 07 December 2016 - 06:44 AM

I never got the greatest results miging ss with 308 wire and 75/25. On the rear section of the exhaust I used the er70s wire and painted the welds with high temp silver spray paint.
:1983 280zx turbo, L28ET, custom cam grind, 96 saab 900 intercooler w/2.50" piping, 3" mandrel bent exhaust, megasquirt II v3.57, 540cc injectors, walbro gsl392 255lph fuel pump, aeromotive regulator, -6 supply lines, custom fuel rail, MSD ignition wires, MSD 8202 coil, homemade boost controller, Garrett TC4305 turbo, 70mm throttle body, Godzilla BOV, Turbonetics wastegate, custom intake, custom turbo header, Cooling Mist H2O/meth injection, 20psi boost, all stock body, stock interior and weld draglite wheels, TH350 trans 4000 stall with B&M 'street stick' shifter and hughes trans brake, nitto nt555R drag radials, best 1/8 mile of 7.53@ 98 mph

#6 seattlejester


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Posted 09 December 2016 - 09:34 PM

My understanding was that not using tri-gas would end up with a weld joint that would eventually rust. If the piece isn't going to detriment from a little rust then no problem, but if you want the stainless property of rust resistance then tri-gas was the way to go.


Definitely different, I believe we had to play with the settings on the welder which we were using to do a couple mild pieces further down on the exhaust, different intensity and speed needed.

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