Texas Tradition
Member
Bought 20 joints of 4" drill stem pipe. Trying to weld it and having hell. Any ideas on how to demagnatize this pipe? Thanks TT
- Thread starter Texas Tradition
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Anonymous-0
Well-known Member
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
Ultradog MN
Well-known Member
- Location
- Twin Cities
BCnT, you are correct.
DC machine, wrap your stinger lead around the pipe several times - more or less depending on how much magnetism in the pipe. - experiment. Also have to experiment which direction you wrap it. - CW or CCW. I spent a season welding used drill pipe in Anchorqage, AK. They pile drove it down into the permafrost and we set I beams on top and welded them on for foundations for houses.
DC machine, wrap your stinger lead around the pipe several times - more or less depending on how much magnetism in the pipe. - experiment. Also have to experiment which direction you wrap it. - CW or CCW. I spent a season welding used drill pipe in Anchorqage, AK. They pile drove it down into the permafrost and we set I beams on top and welded them on for foundations for houses.
Joe N E Texas
Member
135 pretty well covered it that sure takes the fun out of a job . Ac will help, experiment with it . What rod are you using?
Texas Tradition
Member
Thanks for all of the replies! Using a Lincoln diesel 250 portable machine. 7018 DC stick rod. Also have 6011 rods. 3/32 and 1/8 in both types. Will give it a try with yall's ideas! Thanks TT
Anonymous-0
Well-known Member
Use 7018. Drill stem isn't really intended for welding so 7018 would be the best choice of the rods you have. Use more tacks. You could run a pass with 6011 followed by a second pass with 7018 though. With 1/8" rods, you should be able to solve a lot of the problem by playing with the ground clamp. Dave
Joe N E Texas
Member
When you get finished with that post back and tell how it went. If you are lucky some joints won't be as bad as others.
Geo-TH,In
Well-known Member
Never demagnetized 4 inch pipe. I used to demonstrate to students how to demagnetize screwdrivers. You would place the screwdriver inside a coil of wire and connect the coil to ACV. Pull the screwdriver through the coil and it will scramble up the magnetic domains which is what it takes to demagnetized. To magnetize a screwdriver, connect dcv to the coil for a few seconds. The number of coils and the amps will determine how well this works. Of course, soft metals will not retain magnetism like harder metals do.
Just a brain storm here. What if you could put many wraps of insulated wire around the pipe and connect an AC welder to the wire. The longer the wire the better and of course the wire will have to handle the amps you feed it with the welder. Move the coil of wire down the length of the pipe. Don't see why this wouldn't work. LOL George
Just a brain storm here. What if you could put many wraps of insulated wire around the pipe and connect an AC welder to the wire. The longer the wire the better and of course the wire will have to handle the amps you feed it with the welder. Move the coil of wire down the length of the pipe. Don't see why this wouldn't work. LOL George
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