Leif, When welding 4130, post heating (often done with an oxy-acetylene torch applied to the weld regions) is not a concern if the material is less than 1/8" (3 mm) thick. This certainly applies to engine mounts. I would put it on the plane and go flying without the post-heating. I can dig up the specification if you need it, but I doubt that you will.
20 years ago, I attended a Sportair Workshop on welding 4130, taught by the guy who wrote one of the first specs for that, and he said we'd never need to post-heat, as long as we didn't weld anything outside in the cold with the wind blowing. The goal is to let the weld cool slowly, which is the way it usually works inside a weld shop. I've never bothered with it, and have welded several components from 4130. I've never post-heated, and have seen no cracks so far. Mark Langford, Huntsville, AL ML "at" N56ML.com www.N56ML.com > -------- Original Message -------- > Subject: KR> Engine mounth > From: Leif_G_Alstadsæter_via_KRnet <[email protected]> > Date: Thu, January 17, 2019 4:25 am > To: "[email protected]" <[email protected]> > Cc: Leif_G_Alstadsæter <[email protected]> > > > 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> > _______________________________________________ > Search the KRnet Archives at > https://www.mail-archive.com/[email protected]/. > 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 [email protected] _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/[email protected]/. 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 [email protected]
