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Welding queston - welding magnitized pipe

benzapped
I need some advice from experienced welders on welding pipe that is magnitized. I am making fence braces out of used 2-3/8" drill string pipe. The spinning of the pipe when it was used in the oilfield apparently magnitized the steel.

I need fairly strong welds. My question is, how do you weld magnitized pipe and get strong welds. I have a Miller Bobcat welder and lots of 6011 rods...and maybe a few 7013's. Any suggestions?

Thanks,
Ben
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Comments

11 comments

Date Votes
  • asphalt cowboy
    Interesting question Ben. I've never heard of a magnetic field causing problems.
    By "drill string" are you referring to what we here call drill stem? Might have a different metallurgic make-up maybe. The stuff I had came from a friend who drilled water wells. Using my Lincoln AC225 I had no issues welding drill stem with 7018.
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  • gjshaw
    Tape a set of magnets to the oppeset end of the pipe that you want to weld, that will demagnatize the end you want to weld, and use 3012 rod. I stayed at a Holiday Inn express last night so I know all the answers.
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  • Captplaid
    We got some threaded drill casing around. Dad got it from a friend at a sandpit. I suggested welding it once. He thought it would be probelmatic due to hardness. We never tried it. It's still lying there.
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  • Zebra
    Use a 6010 +5P 1/8 rod and run your heat higher then normal about 120A. Follow with a E7018LH rod. Magnatized metal tends to make the metal roll out of the weld area. The +5P 6010 will dig and get fusion, but it will not look pretty because of the polarity. I've encountered this alot before. And the Miller Bobcat is a good machine! My .02 cents
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  • givette
    Go to the electrician supply..ask them if it's feasable to 'degauss'. Then you will be able to perform your work without the nuisance of a magnetized medium. Best, Joe
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  • asphalt cowboy
    Now this has me baffled. Does drill stem always magnetize during a drilling operation?
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  • dbain99
    No, we have a rack of unmagnetized drill stem. I have never encountered a problem with welding it.
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  • tobefree
    Just demagnitize it...problem solved!!!
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  • BlueTic
    Any heat achieved over about 1800f will demag an area on mild steel. but one little trick is to split your ground clamp and ground at both ends. As stated 6010 root pass and then 7018 over that. Your 6011 will work but for strength get some 7018 for fill and cap. Sorry I'm just assuming you are going to bevel the pipe ends for the weld. I personally would only run my 6010 pass at about 90 on this small of pipe.
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  • barto
    Doesn't steel become non-magnetic somewhere around 2000 degrees?
    (about welding temperature)
    [?]barto[?]
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  • kyplumber
    wrap your negative lead around it about ten times, then hit your stinger on to your ground, check for magnetism... if it is worse then wrap your positive lead around the pipe, and hit it again...
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