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MIG welding 304 stainless

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#21 ·
15 cfh seems a bit low to me, but the weld looks good. What size nozzle is on your gun?
 
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Discussion starter · #22 · (Edited)
Played around a little more today.
I went up to 20v/240ipm. Inductance is at about 90%. For my motion I led a little bit in the bottom toe then dipped back for the top.
A little more spatter than I would like, but I won't get too picky on that right now.

I set the gas about 30cfh. Any higher and it started to burn back.
That's on the "Helium" range on my flow meter. It doesn't have a scale for the mixture. How far off could it be?
Forgot to measure the nozzle size. I think it's 5/8"

Plasma-Head said:
If its thick enough to get away with it, stainless fluxcore can do some wonderful things...
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I'm only on 1/8". But that look really nice. What wire is that?

Thanks for the help so far.

Edit:
I ran a downhill pass and got that nice rainbowish tint in the weld. Is that at all indicative that I may be a little off in my flat settings?
 
#27 ·
clankerr said:
Going to play with some 308 MIG and tri or try mix for my shield. Backing gas needed for pipe welds?
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Would be helpful. As I recall as the weld reaches 3 mm or 1/8" in thickness you can dispense with the purge. I like a little more thickness since the purge is already setup. Argon is my purge gas of choice.
 
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#28 ·
Much appreciated guys. I'll fool around with both and try to remember to get back to you.

We may be getting some stainless jobs on a regular basis in the near future. And a lot will have to be TIG welded. I'm not a fan of taping off ends to purge and taking blanks on and off flanges doesn't seem very cost effective either. Any suggestions for plug/purging equipment manufacturers? Like a multi-pack setup 1/2" through 4" pipe.

colindstark said:
Not really the higher flow rate vs TIG will push enough into the pipe

Sent from my XT1585 using Tapatalk
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#29 ·
depending on the service for this piping, solar flux might be the answer for your inside diameter protection. Code shops will often employ Lincoln STT welding systems or possibly the Miller RMD or PipeWorx combos, I am sure that Fronius and others have similar systems that do the same. Whenever SS is welded without providing for an internal purge you just have to have procedures that are proven to provide adequate finished results for the root pass/internal weld zone. Best regards, Allan
 
#30 ·
A couple weeks ago an old man brought me a LARGE 1/4" thick stainless pot and top hat he wanted to assemble to cook alkyhol......I had never welded stainless either mig or tig, so told him to bring stainless wire filler and I'd attempt it tig.....I didn't have tri-mix nor spool of wire and didn't even want to bother to price it nor expect the old moon shiner would want to pay for it...And told him I was NOT going to town to find it....He arrived with a fist full of wire and his bed full of stainless parts.

I have no idea what grade of stainless the pot was and the filler wire....but it welded well with my HTP-221 tig...A first for me, so I did it free.

Yeah, I know you are asking about MIG stainless, but I want to add that tigging it seemed really no different than tigging thick plain steel....Well, except my 150 amp torch got hot quick, so I bought a 250 amp 20 series torch and water cooler immediately afterwards.
 
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