Why is aluminum alloy 7075 not listed in AWS D1.2, Structural Welding Code - Aluminum?

Most aluminum alloys are weldable, but a fair number of them are not, including 7075 aluminum. When designers and welders look for an aluminum alloy to use, many will start by reviewing a table that lists all of the aluminum alloys and their strengths. Alloy 7075 is often selected because it is one of the highest strength aluminum alloys.

But, few of the higher strength aluminum alloys are weldable, especially those in the 7000 and 2000 series, and they should not be used. The one exception to the rule of never using 7075 for welded applications is in the injection molding industry, which uses 7075 dies and will repair them with welding. However, 7075 should not be used for structural work.

When you need to design something of high-strength aluminum, look to a 5000 series high-magnesium alloy instead of a 2000 or 7000 series. The 5000 series alloys are weldable and will produce the best results. Q: Why is my aluminum welded connection so much weaker than the base material?

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