Effect of Weld Solidification Mode on Tensile Properties of Aluminum Weld Metal

概要

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Bead-on-plate welding was performed on sheets of 99.96% and 1050 aluminum and 5052 and 5083 aluminum alloys with GTA. Macrostructures of the weld metal varies when the welding conditions and the materials are changed. The effect of the weld solidification mode on tensile properties of the weld metal was investigated. The results showed that the tensile strength of the weld metal of 99.96% and 1050 aluminum was approximately the same as the base metal. On the other hand, the elongation of the weld metal decreased much when the growth direction. of the columnar crystals became normal to the tensile axis. The tensile strength of the weld metal of 5052 aluminum alloy increased as the amount of the equiaxed dendrites in the weld metal increased. Moreover, the weld metal of 5083 aluminum alloy which consisted of only the equiaxed dendrites had nearly the same tensile strength as the base metal. Besides, the investigations were made on the relationship between tensile properties of the weld metal and the width of the columnar crystal and also on features of tensile cracks in the weld metal. It was observed that the width of the columnar crystal did not have significant effect on the tensile properties of the weld metal. Tensile cracks were observed to initiate mainly along grain boundaries of the columnar crystals when the growth direction of the columnar crystals became normal to the tensile axis.
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