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MIG welding

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Range Rover Blues:
It can depend on the quality of your welder too.  I've heard of batteries exploding whilst the car was being welded.  It's partly due to the return current through the chassis which can cause a voltage drop accross the ground plane, partly due to the AC nature of rectified DC used in welders.

mark.yellow.series.3:
i weld on a lot of, engine/electronically controlled equipment, on odd occations i havnt disconnected tyhe battery, and all well. but i wouldnt recomend it at all.
disconnect the battery and you should be fine.
but i while back i bought a welding surge suppressor that just clips to the battery and bobs your uncle.

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