Evaluation of 6061-T6 to 2014-T6 and 6061-T6 to 6061-T6 Aluminum Alloy Welds

摘要

This weld-evaluation program was conducted by simulating the cap-to-skirt weld junction, the cap-toskirt T-weld junction, and the cap-to-outlet weld, and testing and examining these simulated welds for tensile tukon microhardness, and metallographic data. In addition special studies were made of welding under stress, mismatch of material thickness, and weld heat-affected zones. Confidence levels of 99.5%, 99.0%, and 95.0% for design application on fusion-, lap-, and T-welds are included. This report substantiates previous evidence that microcracks will not result from a 2014-T6 to 6061-T6 combination, provided the alloys are fusion- or T-welded and not lap-welded. This report also substantiates the fact that thickness mismatch in similar lap-welded metal junctions does not produce microcracks. Minimum ultimate tensile strength (UTS) data reveal that the use of thinner-than-anticipated dome material may be possible. Data on weld heat-affected zones prove that the heataffected zone of 6061-T6 is greater than that of 2014-T6 and furnish the land widths necessary to restrict heat flow during welding of fusion and lap welds. (Author)