316 stainless TIG, what happened here?

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Had some "pans" made out of 12 GA 316SS.  Used a new supplier.  Just called out "all seams continuous welded" as I had before.  These have significant burn through.  I think it looks pretty lousy.  What did they do wrong (if anything) and how do I prevent this in the future?  The last batch from the other supplier looks MIG welded, where these look TIG welded.  Is that the main difference? Attached Images
Reply:Sugaring from not shielding the back of the weld from atmosphere (this is the backside of the weld right?).If they get/make a shielding block for the back side, it will look like the other side. Not sure what happened at the turkey**** end, probably just had a gap from bad fitup or blew through from too much powuh.Welding/Fab Pics: www.UtahWeld.com
Reply:Humbly, that doesn't really look like typical stainless oxidation to me.  I'm really not sure what it does look like but If I had to guess (which I don't.  But hey, that's what these places are for, right?)  I would say that the base material is either contaminated with something or is a pi** poor grade of stainless.  Feel free to correct me.  Are the welds porous?
Reply:looks like bad fit up and to hot on the amps to me having a copper backing or argon woulda helped most places consider that to be a waste of time though. Or maybe thats just the place im layed off from at the moment???
Reply:That's Sugaring, through lack of shielding as the 2nd reply stated. Antinox (sp) or similar will remove the Sugaring . Shielding (backing strip etc )that side of the weld will prevent it
Reply:Can someone please recommend what language I should put on my print to prevent this in the future?  How about: "Protect back side of weld by using back purging with Argon gas, Solarflux type B, or similar method to prevent discoloration, burn through and sugaring"
Reply:Originally Posted by MigionCan someone please recommend what language I should put on my print to prevent this in the future?  How about: "Protect back side of weld by using back purging with Argon gas, Solarflux type B, or similar method to prevent discoloration, burn through and sugaring"
Reply:Originally Posted by MigionHad some "pans" made out of 12 GA 316SS.  Used a new supplier.  Just called out "all seams continuous welded" as I had before.  These have significant burn through.  I think it looks pretty lousy.  What did they do wrong (if anything) and how do I prevent this in the future?  The last batch from the other supplier looks MIG welded, where these look TIG welded.  Is that the main difference?
Reply:I would be pissed! What a waste of 316. I would like to see pics of the outside. If it looks good i would tell them to shield the back next time or no more business. But because they didn't do it in the first place i would probably just find another shop.Last edited by travisc454; 07-26-2011 at 11:53 PM.www.performancealuminumfabrication.com
Reply:did they somehow use mild steel filler?
Reply:Originally Posted by ironmangqdid they somehow use mild steel filler?
Reply:Sorry!  You are right, it is 304.  Yes the other side looks fine.  But it looks "flat" where the original I liked looked "round", so that is why I thought it was TIG vs MIG, but my boss says it is just "fused" but I don't know, I think there is definitely filler used.I am going to send photos to the sales person and get their explanation about it.  They are a high end supplier usually so that is why I am surprised.
Reply:how do you get the gas to stay on the backside of the weld?
Reply:Too big a tungsten, too much heat, not properly shielded, moving too slow, don't know how to weld thin stainless?    Could be any or all of the above.......Burn through is not paying attn......  Miller Dynasty 350Twenty Six HammersThree Crow BarsBig Rock
Reply:Originally Posted by aarcweldinghow do you get the gas to stay on the backside of the weld?
Reply:Originally Posted by MigionCan someone please recommend what language I should put on my print to prevent this in the future?  How about: "Protect back side of weld by using back purging with Argon gas, Solarflux type B, or similar method to prevent discoloration, burn through and sugaring"
Reply:just made this today. bronze works as good as copper Attached Images--------------------------------------------------------------www.becmotors.nlyup, I quit welding.. joined welder anonymous