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Bolt cam surface rehardening
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I am contemplating some weld build up work on a pre 64 mod 70 bolt handle- cosmetic only. How do you reharden the camming surface after all work is completed? Thank you.
 
Posts: 1192 | Location: Wyoming | Registered: 04 April 2009Reply With Quote
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Originally posted by kda55:
I am contemplating some weld build up work on a pre 64 mod 70 bolt handle- cosmetic only. How do you reharden the camming surface after all work is completed? Thank you.

With a good heat sink, re-hardening may not be necessary at all. If cocking becomes difficult though, you can re harden by heating to a bright red (use a slightly carbon rich flame) and quenching in oil. Regards, Bill.
 
Posts: 3852 | Location: Elko, B.C. Canada | Registered: 19 June 2000Reply With Quote
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I do not need to do so because I use TIG welding and don't over heat them. Also, bear in mind that Model 70s are not made from case hardened mild steel, They are 4140, which already has carbon in it. So be careful.
 
Posts: 17387 | Location: USA | Registered: 02 August 2009Reply With Quote
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Thank you, I will proceed slowly.
 
Posts: 1192 | Location: Wyoming | Registered: 04 April 2009Reply With Quote
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The reason for using a slightly carburizing flame is so you don't lose carbon. The same method even works on 700 bolts. You just have to localize the heat. Do not quench in water. Regards, Bill.
 
Posts: 3852 | Location: Elko, B.C. Canada | Registered: 19 June 2000Reply With Quote
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Thanks all I'm good to go. So much great information sharing on this site from the pros.
 
Posts: 1192 | Location: Wyoming | Registered: 04 April 2009Reply With Quote
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Heat paste and a heat sink.. heat should be as little as practical to prevent softening


opinions vary band of bubbas and STC hunting Club

Information on Ammoguide about
the416AR, 458AR, 470AR, 500AR
What is an AR round? Case Drawings 416-458-470AR and 500AR.
476AR,
http://www.weaponsmith.com
 
Posts: 40081 | Location: Conroe, TX | Registered: 01 June 2002Reply With Quote
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It's not the process gentlemen, it's the repair should the project go south. Always have a plan B.
 
Posts: 1192 | Location: Wyoming | Registered: 04 April 2009Reply With Quote
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