Pursuit Reincarnation Dog
Join Date: Apr 2001
Location: Melbourne VIC
Re: Mig welding
I bought a MIG welder when I was an apprentice over 10 years ago and I still have it and it comes in handy every so often. When you think about it it's saved me a fortune in time and money stuffing around getting small jobs done and it cost me maybe $900 at the time. It's a Unimig 120 which is portable and still handles pretty much everything.
I have done panel work and the trick is to use cadence welding at high amps. What you do is crank up the amps and notch up the wire feed. Clean/prep the metal well and apply anti-spatter spray. Also, where possible use a heatsink on the rear of the weld area. Then weld very small sections at a time (like one-two seconds at a time and apply in stitches over different areas). You can then come back and fill in the gaps to reduce the overall heat loading into the metal. The high amps short duration keeps distortion down and reduces burn through.
having said all that you should have seen some of the stuff ups I did when I was learning. In the end I went to a wrecker and scabbed some stuffed panels to learn on.
BA'1.5' Pursuit 290
Lightning Strike / Reflective Orange Stripes
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