What happens to welded material during the anodizing process? Why is it suggested that welded material is painted rather than anodized?
Due to the inherent nature of the welding process, it is extremely difficult to obtain color consistency in welded areas when anodizing. The main issue lies in the differing alloys of the welding rod and the aluminum. With most standard applications, the difference in alloy will result in the weld anodizing as an inconsistent dark or dull silver-gray while the part itself would have a clean and uniform warm gray finish. This difference in color is extremely noticeable when the welds are exposed, and our customers generally deem this as unacceptable. There are some welding rod alloys that are supposed to accept the anodizing process, but past experience has shown that even these will still result in a non-uniform finish. In the rare case that a close color match is obtained, there is still one problem that is essentially unavoidable. The heat generated while welding changes the temper of the aluminum that has come in contact with the welding rod. After the material is anodized, a light
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