BUBBLE GUM WELDS can they fixed

Old 11-06-2012, 06:01 PM
  #11  
todd8525
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I know very little about TIG welding.I bought an aftermarket rear sus.for my truck.the truck is on a jig and the rear sus.has been tacked with MIG.The finish welding will be TIG, by a pro. Have i done more harm than good,by tack welding in MIG.
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Old 11-06-2012, 08:38 PM
  #12  
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No, you're fine.I thought this was a continuation of the original post in regards to gloppy welds. Tack with mig, weld 'er up with tig is OK.
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Old 11-07-2012, 04:34 PM
  #13  
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cool thanks.
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Old 11-08-2012, 03:01 AM
  #14  
outlaw256
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dont have a tig welder here but i gotta hell of a big mig. we have built frames amd everything else you can think of. why is tig now the only way to go when mig was it before. someone with a gun in his hand that knows how to weld can weld a frame up just as good and strong as tig welded.imho...
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Old 11-08-2012, 03:39 AM
  #15  
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Default Re: bad welds

I have done quite a bit of TIG welding so here is my opinion on a couple of things asked here.

Originally Posted by todd8525
Not sure but i was told u are not suppose to TIG over a MIG weld?Yes /No or is this a myth.
I believe the issue would be if the whole thing were MIG welded and then ground down / or not, then TIG welded over because the TIG is such a smaller weld bead that you would not get weld penetration to the base metal only into the weld already there.

Originally Posted by outlaw256
dont have a tig welder here but i gotta hell of a big mig. we have built frames amd everything else you can think of. why is tig now the only way to go when mig was it before. someone with a gun in his hand that knows how to weld can weld a frame up just as good and strong as tig welded.imho...
I think because moly tubing is so much more prevalent than in the old days. Tig does provide a smaller nicer looking weld in the right hands and MIG is not recommended on moly even though it can be done. It is a little harder to tell the penetration of a MIG weld also.

Curtis
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Old 11-08-2012, 04:39 AM
  #16  
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10-4 on the moly and mig, unless you for sure know what you are doing, i would stay away from any high stress areas, with mig welding and moly tubeing.
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Old 11-08-2012, 04:59 AM
  #17  
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I'm assuming he's got a mild steel assembly. 'Aftermarket rear clip'
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Old 11-08-2012, 11:09 AM
  #18  
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Originally Posted by TheYellaBrick
I'm assuming he's got a mild steel assembly. 'Aftermarket rear clip'
Could be either, but you weren't wrong. It can be tacked with MIG and finished with a TIG.

Curtis
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Old 11-08-2012, 05:06 PM
  #19  
todd8525
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i myself fixing the bubble gum-use a mig.I was asking a different question.sorry.Now im not a pro.but decent with a MIG.Watching pros. on TV and such i seem to see them MIG the frames then TIG the cage.I'm a collision repair tech and fix wrecks all day long.But welding a full frame or a cage no.I'll leave that to the pros.I stand behind my repairs.but don't feel comfortable roll testing a cage that i welded.
I'm building a 98 gm regular cab with a 10 foot box dually,twin roots blowers from a 3.8 liter 6.6 duramax.The rear sus is a 4 link bag kit.I'd rather ask guys who do this all the time rather than the smuck at the local donut shop.Thanks again fellas.
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Old 11-09-2012, 04:11 AM
  #20  
outlaw256
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Default Re: bad welds

Originally Posted by curtisreed
I have done quite a bit of TIG welding so here is my opinion on a couple of things asked here.

Originally Posted by todd8525
Not sure but i was told u are not suppose to TIG over a MIG weld?Yes /No or is this a myth.
I believe the issue would be if the whole thing were MIG welded and then ground down / or not, then TIG welded over because the TIG is such a smaller weld bead that you would not get weld penetration to the base metal only into the weld already there.

Originally Posted by outlaw256
dont have a tig welder here but i gotta hell of a big mig. we have built frames amd everything else you can think of. why is tig now the only way to go when mig was it before. someone with a gun in his hand that knows how to weld can weld a frame up just as good and strong as tig welded.imho...
I think because moly tubing is so much more prevalent than in the old days. Tig does provide a smaller nicer looking weld in the right hands and MIG is not recommended on moly even though it can be done. It is a little harder to tell the penetration of a MIG weld also.

Curtis
well curtis thats a good answer. and you are right about that. but ive built frames and for hotrods and racecars with my mig and we have them all stand strong for yrs. i made a roll cage back in the mid 80s that got a true test in a 57 chevy ,buddy rolled his streetracer at 100 mph and walked away with a hell of a headache but he walked away. yeah tig is pretty but is it really stronger. that doesnt make any sense for it to be stronger if you really break it down.
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