Re: Bolt extraction welding rods


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Posted by Joe Lorenzino on Monday, August 04, 2003 at 1:18AM :

In Reply to: Bolt extraction welding rods posted by Rick E on Sunday, August 03, 2003 at 10:12PM :

At the shop I work in, we use an Arctec #65 Unichrome rod for bolt removal ONLY where we cannot use our TIG welders. I agree with building up through a nut, and beginning with the nut over the broken bolt helps prevent starting an arc to the metal around the bolt. I always use a fine thread nut that is one size larger than the broken piece, as the flux on this rod forms a barrier between the weld deposit and the nut so you will end up with a buildup that is near the same size as the bolt. Using a nut as a guide also allow you to put more heat into the stud without having the weld deposit "run away". The idea is to get enough heat into the broken piece to cause the rust to break loose, and to get the stud to shrink as much as possible. We use WD40 to quench the bolt as it won't make it quite as hard, and adds some lubrication. The TIG welder and a stainless alloy filler rod is still my first choice for removing broken easy-outs, broken drills, broken taps, AND the broken bolt or stud that these items are usually imbedded in by the time I see them. J.V.L.



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