Generally, aluminum alloys are considered suitable for welding aluminum extrusions. However, the capability to be welded for specific aluminum alloys can differ. The particular properties of an alloy determine how well you can weld that material. The most important aspect of the alloy is its chemical composition. For instance, 7075 alloy aluminum extrusion welding and others have high zinc content. They may be relatively difficult to weld. However, an alloy such as 5083 and 6061 alloy aluminum extrusion welding are easier to weld due to their different compositions. But remember that the welding technique also matters.