Mig welding advice?

I'm trying to butt weld some donor floorpans with a mig. using .035 wire. spots turnout really nice ,with only a few burn throughs, but looks bad after I grind, and the underneath looks really bad. Would it help to use .023 or .030 to get a better smoother job. I'm also using gas not flux wire. Any help would be appreciated, thanks

 

It allways looks ugly when you are playing "connect the spots". Trick is to literally weld the spots together as opposed to just putting em down next to each other. If you are getting a weld that looks like "bird poop" You may need a bit more heat. It would really help to see what you have. (We like pics) Other wise it just guessing on my part. Are you welding indoors or out side. It makes a difference with regards to your sheilding gases' pressure setting. This will affect the quality of the welds. Take some pics man!!!

 

What pattern do you make with your wire to form the puddle?

 

I've been pretty successful so far using .023 for sheet metal and .035 for heavier metal like caging and torque boxes

 

Sounds like you are getting my old floorpans put in. Congrats!!

 

I used .023 for the floor pans and the torque box. Just turn up the heat and adjusted my wire speed to get penetration. Just practice on some junk sheet metal first!

 

Thanks guys, like all the help I've gotten on this site, stopped and got .023 and tips today, turned heat and wire up and looks a lot better. Still using spot and stitch, but results are more what I want. Yea Craig, I just finished the passenger side, (looks a lot better) then before. Thanks for the advice all, I"m sure I will need lots more!!!

 

For the clean up try a grinder 120 grit buffing pad followed by a wire wheel or maybe the wire wheel alone.