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Yep….I’ve reach out to two of my buddies. Both pro TIG welders. They said good luck
I have to agree this would be a very difficult thing to do. I tig weld a lot! I only do gun stuff and rewelding parts kits is a large majority of the stuff I do. A lot of the older AR receivers were 6061. So are you sure its 7075? I'd be happy to look at it and do the welding if I think it's possible but I'm not cheap and it's gonna cost a lot more than a new 7075 receiver will.I know it is supposedly un-weldable however I also know it can be done and seek someone with the necessary experience. There will be a demonstration pretest after the Q&A interview.
My project is a 60yr old AR lower receiver, I need to tig weld the trigger well channel, the front and rear halves of a bandsaw cut de-milled lower. Trigger well has a 6061 block inserted to back the weld and needs to be penetrated by the weld so it can be milled out later. Wall thickness is .100" +/- 040". If anyone here knows who John Norrell is he was the pioneer in this twenty years ago but is no longer accepting these types of projects.