Effect of Welding Condition on Solidification Structure in Weld Metal of Aluminum Alloy Sheets

概要

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Bead on plate welding was performed on 1 to 1.2mm thick sheets of 1050 commercially pure aluminum and 3003, 5083, 6061 and 2024 clad (with 0.2mm thick 1050) aluminum alloys with both TIG arc and electron beam weldings. Firstly, the investigation was made on optimum welding conditions of each material and the consideration was made on that result from heat conduction theory. Secondly the relation between-the welding conditions and the solidification structure in weld metal of each material was investigated. Solidification structures of the weld metal were varied largely when the welding conditions and the materials were changed. Stray crystals were developed in each material except 3003 at a low welding speed of TIG arc and at every welding speeds of electron beam. In 3003, axial crystals were developed parallel to the welding direction at a low welding speed. Equiaxed crystals were developed in every materials and the ease of development of this crystal was greatly affected by solute content, heat input and welding speed. The consideration was made on these three crystals.
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