need help

[Rocketman]

If you are going to be doing welding on a car it will be lot easier if you convert to gas.

 

[david aldridge]

i have converted to gas now. now how are these weld looking . the one that numbered 1 is 2 plate butt welded and I kept stopping every inch to stop the plate from warping . the first pic I tried to lay 4 rows on top of each other and then two single plus it looks the same on the back. I tried to do 90 degree angle bit but it just blew threw . any tips please . I got it on the lowest setting and wire speed 6

 

[Jan]

Those welds don't look half bad. I would say that they will look far better with the excess metal ground off. However I'm guessing that you did them flat on the bench so that the excess heat was soaked up by the metal work top. Once you have air on both sides of the material(s) being stitched that no longer happens thus allowing the metal on one side to slump and blow away. Try edging the wire speed down a little at a time until it stops blowing through. The problem may turn out to be a lack of a low enough power setting to prevent you pushing too much heat into metal of that gauge.

 

[Fixer]

I look at it this way

stuttering/birdpoo/tall welds/no penetration = wire feed too fast /amps too low/moving too fast/arc too long/material too thick
burning back/blowing holes/overpenetrating = wire feed too slow/amps too high/moving too slow/arc too short/material too thin

 

[david aldridge]

I made up a little stand so I could weld without touching the bench . because I thought that the bench would the the heat and give me false setting for when I do the car . so they where about 2 inch off the bench . this is only 1 mm thick sheet . I turned the wire speed up because it kept popping and burning back the wire and I have tried turning it up to 2 and the welds penetrated too much they ended up being wide and sunken they looked better on the under side .and if I turn the wire down below 5 it starts popping again . I am in doors with the metal off the bench and welder set on 1 / min wire speed 6 and gas on 10lpm even when I tried setting 2 the gas has been on 10 but I can't seem to trun it sown below wire speed 5 without popping

 

[Jan]

In my limited experience I would put this down to a speed issue. If the wire burns back the feed rate is too low. If the metal now blows through you need to move a little faster. If you still can't stitch the pieces together the amperage is too high even on the unit's lowest settings - a common fault with many of the ... less expensive machines.

 

[sapperb]

Clean up your welding surface..You've got to show it some love. Set yourself up for success. Metal prep prior to welding is equally important as the weld..Thats my $0.02..