February 28, 2021, 04:17:10 AM

Author Topic: Welding stainless to mild steel  (Read 4208 times)

Offline BeasTT

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Welding stainless to mild steel
« on: February 28, 2011, 12:15:52 PM »
Any special prep work need to be done? I've got 308 MIG wire and 309 filler rod. Does that sound alright to use? My fuel sump is stainless and my gas tank is mild. Really don't wanna fuck this up  :) And yes, I know, back purge like a motherfucker to keep from going poof  :halo:
Nick Shultz

1993 Rx-7
371ci, Twin Billet 6265's, Twin A2W's, ProEFI 128, RacePak IQ3,
McLeod RXT, Speedfab 8.8 solid axle, QA1s, FIC 2150cc, Magnafuel 4303

Offline Speedfab

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Re: Welding stainless to mild steel
« Reply #1 on: February 28, 2011, 12:22:46 PM »
Why did you make the sump out of SS?  Just to be wierd?

1) You will not get it on there without pinholes with a mig.  Don't even try.  Then you'll have a junk tank.

2) Find someone really good, or the same will apply to doing it with a tig and 309.

3) Personally, I'd make another from mild steel and do it that way.


unless you own a turbo ls9 rx7 you do not know what the fuck you are talking about.

Offline Copper280z

Re: Welding stainless to mild steel
« Reply #2 on: February 28, 2011, 12:25:02 PM »
Solder it, use SS flux on the SS and regular on the tank. Tin everything before you put the two together. Are you planning on using a sealer on the inside?
-Bob
'77 280z - Boost - 12.6 at 108
'87 Rx7 - 5.3/t56 - 13.0 at 107

Offline BeasTT

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Re: Welding stainless to mild steel
« Reply #3 on: February 28, 2011, 12:30:04 PM »
I didn't have any mild sheet and I'm to lazy to redo it and buy mild. Plus I figured if it bottoms out and scratches, the SS won't rust. I'm having the guy that TIG'd my kit do it, I just supply materials and he only charges me for the gas
Nick Shultz

1993 Rx-7
371ci, Twin Billet 6265's, Twin A2W's, ProEFI 128, RacePak IQ3,
McLeod RXT, Speedfab 8.8 solid axle, QA1s, FIC 2150cc, Magnafuel 4303