1XXX: Essentially Pure Aluminum Filler Alloys
Keganhirl > 07-10-2019, 08:31 AM
general, 1XXX alloys are very pure, which makes them good candidates for applications in which the primary characteristic of the weldment is excellent electrical conductivity. None of these alloys are sensitive to cracking. That being said, it is best to match the filler alloy to the parent material being welded. For example, an operator would use 1100 filler to weld 1100 parent material.
Sometimes it might be difficult or impossible to find an exact match. In such a situation, a welder should use a filler alloy that is at least as pure as the parent material. Purity is specified in the last two digits of the alloy designation for 1XXX series. For example, 1100 is 99.0 percent pure and 1070 is 99.7 percent pure.
It is not a good idea to use 1XXX filler alloys for welding non-1XXX series base material, nor should they be used to weld 1XXX base material to a base material in a different series. In these situations, the weld will draw in alloying additions from the base alloy being welded, resulting in crack-sensitive weld chemistry.
The 1XXX filler wires are very soft and can be problematic to feed. As a result, a push/pull torch is recommended with these filler alloys.