Thin metal

[RogerK]

New to autobody welding. I am getting quite a bit of blow through while butt-welding 22ga. metal. The seam is tight and fit up pretty well. Using a small Hobart mig 135 on gas, .023 wire, lowest amp and wire feed settings. What gives? Thanks

[Planet X]

Some things to try follows;
1) position part for down hill drag.
2) use fore-hand push if you can't use tip #1
3) increase your electrode stickout
4) 'Skip' the arc
5) try a Argon/oxygen mix say 2% Ox



By "skip" think of your arc as pebble you want to skip across a pond. Rotate your gun hand closer to the work surface and rotate your contact tip upward (within reason).

Ok, I don't mean bouncing your arc mostly what I'm trying tosay is turn the work angle in such a manner that the arc force is reduced because of the shallow angle. If you point your gun straight into the material you will blow right through-dig?

[MikeR]

Planet X, I can't believe you explained that well enough to understand... you musta wint to kolidge.

Impressive, dig?

[Franz]

I think your problem is more related to the joynt design than it is to welding.
Most autobody patching is done with a lap joynt. There is a nice tool that downsets the metal and punches holes so yu can easily plug weld the patch in place that you can buy for under $50-.

[Hobart Expert Rock]

ROGERK.............WELCOME ABOARD......... DID ANY OF THE INFORMATION PROVIDED HELP OUT........... SOMETHING TO ALSO CONSIDER IS WHAT TYPE OF GAS ARE YOU USEING........ALSO A DETERMINING FACTOR.......................ROCK..........
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[R. Nelson]

Re: Thin metal

Originally posted by RogerK
New to autobody welding. I am getting quite a bit of blow through while butt-welding 22ga. metal. The seam is tight and fit up pretty well. Using a small Hobart mig 135 on gas, .023 wire, lowest amp and wire feed settings. What gives? Thanks

what gas are you using?

[RogerK]

Hey, Thanks for the input guys. I have some of my problems solved. I increased the angle of the gun and running a bit of a longer 'stick out'. Welded quite a bit today with no blow throughs. I am using a C25 mix. Thanks.