Posted by 135 Fan on September 05, 2010 at 22:56:09 from (68.149.56.30):
In Reply to: How to demagnatize pipe posted by Texas Tradition on September 05, 2010 at 18:29:54:
An AC machine would actually be better on drill stem because you can't get arc blow with AC. Arc blow is caused by magnetic fields when welding with DC current at high amps. However, drill stem is magnetic in the first place so it can act just like arc blow and blow the arc all over the place. Wrapping the ground cable around the pipe may help, or welding toward the ground clamp, changing the location of the ground clamp or even using 2 ground clamps should help. Using smaller rods, a short arc length, more tacks and/or preheating the pipe should also help. Sometimes you have to drastically change the rod angle to get a decent weld. Drill stem is only good for non critical applications that aren't subject to a lot of stress. I worked at a shop and asked a laborer to find a short section of pipe for a repair on drilling rig mast. I welded it in without much trouble. Thankfully the night shift foreman realized it was drill stem and cut it out and replaced it. It was only a couple feet long, so I never really got in trouble. They just told me to check if the pipe is magnetic so it wouldn't happen again. Dave
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