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Welding a Gear

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Larry Willis

05-17-2003 06:38:31




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I need to build up the splines on a gear where the shifting collar engages the gear. The splines measure about 3/8 wide and about 1/4 high, with about 3/8 inches between each spline. Please advise on the best method to do this, such as type of rod, heat, polarity, preheating and cooling, etc. Thanks in advance, Larry




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T_Bone

05-17-2003 22:09:57




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 Re: Welding a Gear in reply to Larry Willis, 05-17-2003 06:38:31  
Hi Larry,

Lincoln Wearshield ABR works well on AC or DC for a good all purpose hardface electrode inclunding gear teeth.

Depending on how much weld needs to be deposited wheather a preheat and temper needs to be done. I like 300* to 500*f preheat then weld then heat again to 1100*f for temper then cool slowly then bury in sand/blanket works well.

If it's a couple spots on the end of the splines, your choice as too preheat/aftercool.

Keep the weld zone very clean in any event. A slightly longer arc length also helps. Use a short backstep whipping for edge tooth build up.

A practice piece would help nicely to get the feel of weld repair.

T_Bone

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Little Ed

05-17-2003 14:12:01




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 Re: Welding a Gear in reply to Larry Willis, 05-17-2003 06:38:31  
I do this type of work with a TIG and Chronatig 333 filler rod, and work it down with a pencil grinder and diamond burrs. Even a mild steel filler will pick up a lot of the base metal and be next to impossible for anyone but an experienced machinist to mill off. It could also be done with a torch, but I don't like to put that much heat into it. Go ahead and try, you won't be any worse off, and will probably be ahead. Good Luck

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