From: | Dave Hennessey | e-mail: | dave@toyhouse.org |
Subject: | RE: RE: tig rod number for repairing cases | Date: | Fri Nov 6 09:09:24 2020 |
Response to: | 7435 |
I think welding is like tree-felling. Anyone can fell a tree in the middle of an open field. But when the tree is hanging over your house, it's time to call a pro. ----- ORIGINAL MESSAGE FOLLOWS ----- We use ALCO 4145 You can check it out on their website. Your best bet is to send a pure sample piece of the case to a welding material analysis lab and have it checked for a composition print out. Odds are its an alloy that does not exist. However, the Lab can make a educated guess as to the following: Pre heat "in a welding oven", it just can't be done without an oven. What alloy rod to use. What mixture gas and what pressure to push the gas out of the regulator What duty cycle to use on a modern AC tig welder. Part of the AC sine wave will pull containment to the surface the other part of the wave will lay down the new weld. Use a stainless steel burr to remove the carbon that floats to the top of the weld puddle. Let the puddle solidify and grind out the contaminate. Be prepared to do this a lot. Make sure your welder is a minimum of 250 amps depending on the thickness of the casting you are going to need the horsepower this combined with the welding oven temp will really help with the process. Use of fixtures is advisable it will warp no matter how good you are trick is to hold it to a minimum. Even if you choose to sub out the welding this information should help. Its not black art it science and skill. We have saved hundreds of castings and only were unable to not repair one Henderson Deluxe oil pan through out the years. A subsequent evaluation of that pan found the level of cooper was so high in the alloy it was deemed un weldable. Good luck. ----- ORIGINAL MESSAGE FOLLOWS ----- Hello, can anybody supply a tig or weld rod # to repair cases,thanks for any Help. |
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