Before my neighbor passed away he gave me all of his tools, including the welding equipment. He was a machinist for Smith's Welding Equipment for 38 years so we're talking lots of nice stuff, including several prototypes. Some of which never went into production.
Among the boxes I found two old looking glass jars of of "Welding flux" Superior #8 and #9. This is the first I've heard of using flux for welding.
The #8 reads; For gas welding of Nickel - Chrome - Iron and Inconel Alloys
The #9 reads; For Inert Gas, Metallic Arc or Gas Welding of High Chromium Ferrous Alloys and Stainless Steel.
When would you use this stuff?
Would 4130 be considered a "High Chromium Ferrous Alloy"?
Can this be soaked off with hot water, like brass flux, or will it require mechanical removal?
I TIG weld bicycles using thin wall 4130 tubing and was wondering if either of these could be painted on the inside of the tubes in lieu of an argon purge.