An AC machine would actually be better on drill stem because you can't get arc blow with AC. Just a brain storm here. Again, the magnet must make as much contact with the metal as possible. Don't see why this wouldn't work. They just told me to check if the pipe is magnetic so it wouldn't happen again. They pile drove it down into the permafrost and we set I beams on top and welded them on for foundations for houses. Use more tacks. 7018 DC stick rod. Move the coil of wire down the length of the pipe. I had some casing that was 80 ksi yeild. The jig holds the pole in place, and the drill press, by nature, […] Increase the electric current in the winding and control the evolution of the magnetic field on the meter. I used to demonstrate to students how to demagnetize screwdrivers. This site uses cookies to provide you with the best possible browsing conditions, and for audience rating purposes. Any ideas on how to demagnatize this pipe? The longer the wire the better and of course the wire will have to handle the amps you feed it with the welder. This technique makes it possible to cancel the magnetic field in the weld joint or at the end of the part in order to achieve a weld under the optimum conditions. Thanks for all of the replies! "@id":"https://www.yesterdaystractors.com/cgi-bin/viewit.cgi?bd=ttalk&th=916828", Please note, if you need the pipe to be fully demagnetized, you will need a High Power Demagnetizer (see link). Drill pipe could be approaching 100 ksi tensile strength. I spent a season welding used drill pipe in Anchorqage, AK. Thanks TT, Use 7018. LOL George Never demagnetized 4 inch pipe. They just told me to check if the pipe is magnetic so it wouldn't happen again. I havn't been welding long enough, but expect I will one day. Place of the winding and the generator taking care that the current set point is zero. If pipe end degauss is being used, or pipe pass through at a fixed weld station, then special bobbins are required. "datePublished": "2010-09-05", TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. Thanks TT Never demagnetized 4 inch pipe. Using smaller rods, a short arc length, more tacks and/or preheating the pipe should also help. Use more tacks. The longer the wire the better and of course the wire will have to handle the amps you feed it with the welder. "@id": "https://www.yesterdaystractors.com/" - experiment. We have a pipe spool which is heavily magnetized and can't make the weld. You could run a pass with 6011 followed by a second pass with 7018 though. Use more tacks. 4.3 out of 5 stars 1,218. Wrap your ground lead around the pipe 3 or 4 times. Make a root pass with 6011 using AC. Drill bits are a tools which you would not want to ever be magnetised, it will get covered in chips when drilling ferrous material. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V. window.dataLayer=window.dataLayer||[];function gtag(){dataLayer.push(arguments);}gtag('js',new Date());gtag('config','UA-2430506-3'); Bought 20 joints of 4" drill stem pipe. $6.99 $ 6. Drill pipes used in the upper parts of the drill string differ in both thickness and construction from heavyweight drill pipe (HWDP), used to transition between drill collars and regular, thinner drill pipe. sglide, thanks for sharing the tip. With 1/8 rods, you should be able to solve a lot of the problem by playing with the ground clamp. 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. 7018 DC stick rod. "@type": "ImageObject", Also have to experiment which direction you wrap it. The number of coils and the amps will determine how well this works. Arc blow is caused by magnetic fields when welding with DC current at high amps. We took a hammer to the pipe and ended up taking out a nice 6" section in the middle of the section. What if you could put many wraps of insulated wire around the pipe and connect an AC welder to the wire. "publisher": { How to demagnetize a pipeline? - CW or CCW. This means that every time you visit this website you will need to enable or disable cookies again. Standard drill pipes are long tubular sections of pipe that make up the majority of the drill string. i believe it takes a dc welder and wrapping your stinger lead around pipe a couple times and weld it...thats the way i was told to do it after having same problems...trouble is all i got is a ac cracker box and had a friend weld pipe for me. "url": "https://www.yesterdaystractors.com/graphics/smllogo.png", Drill stem is only good for non critical applications that aren't subject to a lot of stress. What rod are you using? Wrapping work DC welding lead a few turns around magnetized pipe will counter the pipe's magnetism. Industrial pipe prefabrication and installation, Construction of steel / polyethylene pipelines. is our conclusion and by others with direct experience with pipe welding that it is not considered practical to prevent the magnetization of pipes in the normal course of pipe manufacturing, coating, handling, stringing etc and the most desirable situation is to be able to demagnetize the pipe ahead of the alignment and welding process. Position the field meter at the end. Of course, soft metals will not retain magnetism like harder metals do. Sometimes you have to drastically change the rod angle to get a decent weld. Tech Tips: Drill a Hole in a Pipe Without a Drill Press Jan 1, 2014 8:30 AM, By Doug Irwin, CPBE AMD DRB A drill press and drill jig makes drilling a hole straight through a pole or mast a simple task. Thanks TT Use 7018. This technique makes it possible to cancel the magnetic field in the weld joint or at the end of the part in order … Use 16 to 22 AWG insulated wire, and wrap … "@context":"http://schema.org", Any ideas on how to demagnatize this pipe? BCnT, you are correct. Don't see why this wouldn't work. Mr. The pipes need to be able to take the load capacity, the thread dimensions must be correct and fatigue needs to be eliminated. We started welding it up and while cleaning the slag one of the pipes displayed a small crack. Magnetize or demagnetize tools such as screwdrivers and tweezers.. Unit with one opening magnetizes tools inserted through the center hole. It would pay to demagnetize the pipe if the above fails and if this is not feasible switch to AC. 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