Posted by Dave G9N on December 05, 2023 at 00:03:02 from (24.220.196.59):
In Reply to: Braze it or weld it? posted by stevieb49829 on December 01, 2023 at 22:19:36:
I was talking about a low temperature, low strength solder. For brazing, 56% silver 'solder' would be a good choice too. It is confusing when the industry calls silver brazing alloys silver solders. Traditional terminology can be a problem.
Robert (ID) said to preheat and slow cool. Good advice. Cracking is caused by thermal expansion as the weld cools, which causes the cooling metal to pull away from the surrounding metal. Preheating expands the entire part so that there is less of a temperature gradient as the weld cools to the same temperature as the surrounding material. As it continues to cool, everything is contracting at a similar rate.
310 stainless was something of a shot in the dark. There are several nickel iron alloys that might be available in small quantities of wire. They are Alloys 36 (Invar), 42, 48, 52, Balco, Mu-metal and Permalloy. Lots of expensive toys to play with. The alloys are listed in order of Ni content and the numbers are the nickel content. They are low expansion alloys, but mixing with the base metal will change that a lot, since the low expansion is highly dependent on high purity.
This post was edited by Dave G9N on 12/05/2023 at 03:51 pm.
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