STP579: Strength and Fracture of 5083-0 Aluminum Weldments

    Zinkham, RE
    Director of Mechanical Metallurgy and research scientist, Reynolds Metals Company, Richmond, Va.

    Ashton, RF
    Director of Mechanical Metallurgy and research scientist, Reynolds Metals Company, Richmond, Va.

    Pages: 17    Published: Jan 1975


    Abstract

    The mechanical performance of 1 ¾-in. (44 mm) 5083-0 weldments was examined at room temperature and at -320°F (-196°C). The welds were made using 5183 and 5356 electrodes and three variations of the gas metal arc process; these were a twenty-pass vertical procedure, a two-pass high-current flat position method, and a one-pass vertical electrogas technique. It was determined that the tensile and yield strengths of the entire weldments, heat-affected zones and weld metals increased with decreasing test temperature. Both 5356 and 5183 filler alloys produced welds which met the existing codes and specifications; however, 5183 was preferred because it resulted in slight increases in strength with no sacrifice in ductility or toughness. In comparison with multipass welding, the high-current method produced welds with low defect levels and, therefore, higher tensile strengths and elongations. The high-current and electrogas weld yield strengths were respectively less due to coarser microstructures. The notch sensitivity and resistance to a propagating crack were slightly lower for weld metal than for the base plate or heat-affected zone at -320°F. This trend was particularly evident for the high-current welds. However, the toughness of all 5083-0 welds was indicated to be high, and structural failures would be unlikely to occur at elastic stresses unless cracks were very large.

    Keywords:

    storage tanks, weldments, aluminum alloys, cryogenics, mechanical properties, microstructure, toughness


    Paper ID: STP29160S

    Committee/Subcommittee: E50.01

    DOI: 10.1520/STP29160S


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