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Welding question

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Al

03-03-2002 18:53:42




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I have a 1" dia.x 3" long shaft that has been worn down a bit on one side. I was thinking of building it up with a small mig welder and then grinding the weld down. My question is will I warp it ? Maybe I could submerge it in water (except for the area that needs the welding build up) as I weld it? Thanks for any advice. AK




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Al

03-06-2002 16:29:26




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
This shaft is part of a bracket that holds both brake and clutch pedal arms. It turns inside a bronze bushing. When the arm wore through the bronze on one side the shaft wore about 1/32" deep where it made metal to metal contact. I suspect the shaft is just mild steel and with all the good advice I should indeed be able to fix it. Many Thanks, Al



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Steve U.S. Alloys

03-06-2002 05:25:36




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
Hi Al,
What material is this shaft? What is it's function? How did it get worn on one side? Is this a bearing fit? Seal Area? If it is a bearing fit, is the shaft the race? Do you have a metal lathe? Do you have an oxy-acetylene torch? The answers to these questions and possibly a couple of more will help to provide solid advice for your application.
Steve



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kraig WY

03-05-2002 06:11:04




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
I was re-reading you post. If you are concerned about drawing the temper out of the end of the metal not being welded. Use heat stop. A paste sold by Brownells (www.brownells.com) a gun smith supply house. Put the paste on the part not being welded. I've used it while welding on rifle bolt handles to keep from screwing up the temper of the bolt. If you need to temper the pice after then heat it until it reaches critial temperture (a magnet no longer attracts it) quinch in oil then retemper it using a lead bath. You don't need fancy equipment. Use a lead thomemother, bullet casting lead pot. or you can use your oven depending on the temper you're looking for. To figure out what that is look it up in a Machinery's Handbook. I used this procedure while making several gun parts. never failed me yet.

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Andy

03-04-2002 19:53:38




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
If this is used in a high friction situation I would consider arc welding it with a hardface,(surfacing) rod. If you mig weld it with a 110 v welder I wouldn't worry about warpage. As for hardning it I would't do it unless you know what it is, and what temp to quench. If it's a peace of hot rolled round, (low carbon) stock It will be tough to get it mouch harder than it is. If you do try to harden it weld it and let it cool then reheat it evenly with a torch and then quench it. There are color charts available to determine when to quench it.

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kraig WY

03-04-2002 08:05:03




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
I remember a while back I had to build up a shaft for some sort of impeller. I welded up, let cool, turned on a lathe to clean in up, welded, cooled, turned, etc. Kept at it until there wasn't any crack between the welds. Took some time but it worked great.



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T_Bone

03-04-2002 03:31:59




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 Re: welding question in reply to Al, 03-03-2002 18:53:42  
Hi AK,

Run short beads on the piece letting the weld cool inbetween welds. You didn't say how much build up it would take. Depending on the hardness of the shaft you may have to retemper and harden when you done. Depending on the shaft I would also consider tacking the shaft to the welding bench, weld, then let cool until cold.

If you would try the water method, it will suck the heat from the weld puddle thus causing a cold weld joint or poor fusion of the weld to the base metal.

T_Bone

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