Whether to stress relieve the mount or not is another discussion. But you certainly won't hurt it by stress relieving.
To answer your question, stress relieving 4130 should be done at 600 - 675°C for approximately one hour per inch of base material thickness. Since you are using thin wall 4130 tubing, just bringing it to temperature, then allowing it to cool slowly (No quenching) should suffice. If I was treating this in one of my vacuum furnesses before I retired, I would give it 1 hr @ 625°C to ensure thorough heat saturation, then allow it to cool in the furnace. If it is being done in an air furnace, 30 minutes at 625°C should be sufficient, then remove and allow to cool in still air.
When I rebuilt the engine mount for my SuperCub, I found that all the heating and cooling of torch welding was causing significant distortion of the mount to where it didn't fit very well. I bolted it into place and did a stress relieve with a torch while it was bolted in place. Once cooled, it fit perfectly. Had I have had a TIG to do the welding, it is unlikely it would have caused so much distortion, so the stress relief would have been unnecessary.
-Jeff Scott
Sent: Thursday, January 17, 2019 at 4:25 AM
From: "Leif G Alstadsæter via KRnet" <krnet@list.krnet.org>
To: "krnet@list.krnet.org" <krnet@list.krnet.org>
Cc: "Leif G Alstadsæter" <lei...@hotmail.no>
Subject: KR> Engine mounth
From: "Leif G Alstadsæter via KRnet" <krnet@list.krnet.org>
To: "krnet@list.krnet.org" <krnet@list.krnet.org>
Cc: "Leif G Alstadsæter" <lei...@hotmail.no>
Subject: KR> Engine mounth
Hi
I just get welding my Engine mounth with 4130 tube. The company who doing the welding recomended all 4130 to heated after welding to take away «power» from the welding.
I go to a company who can do the heating, but they have to know What temp they have to use.
Have somebody in the group some knowlege about this problem, I love to have this info.
Regard
Leif
Norway
Få Outlook for iOS<https://aka.ms/o0ukef>
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I just get welding my Engine mounth with 4130 tube. The company who doing the welding recomended all 4130 to heated after welding to take away «power» from the welding.
I go to a company who can do the heating, but they have to know What temp they have to use.
Have somebody in the group some knowlege about this problem, I love to have this info.
Regard
Leif
Norway
Få Outlook for iOS<https://aka.ms/o0ukef>
_______________________________________________
Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/.
Please see LIST RULES and KRnet info at http://www.krnet.org/info.html.
see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options.
To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
_______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/krnet@list.krnet.org/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to krnet-le...@list.krnet.org
