アルミニウム合金のレーザ・MIGアークハイブリッド溶接における許容ギャップの拡大に関する研究

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Hybrid welding combinng YAG laser or fiber laser with MIG arc was carried out on aluminum alloy, and the effects of setup conditions of a laser beam and a wire, and the laser beam parameters on wire melting phenomena and gap tolerance in butt joint were investigated. It was found that, in order to obtain a deeper penetration, the laser beam should be separated from the wire with a distance at which there was no direct interaction between a laser beam and a droplet during its transfer. On the contrary, in order to get a wider gap tolerance for a butt joint, for example, it was better for the laser beam to be set to cross with wire over 2mm so that the laser beam could directly irradiate on the wire surface to melt it. As a result, the arc current could be decreased so efficiently that the molten pool size formed by MIG arc decreased and the gap tolerance increased. In the case of the utilization of a fiber laser, it was found that the wire melting phenomena were affected by the laser beam parameters such as the beam diameter and the defocused conditions when welding was not done at a focal position. It was clarified that even at the same laser beam diameter on the work surface the wire melting phenomena could be different under the different defocused conditions. In the defocused conditions that the focal position was over the work surface, the molten droplet on wire tip evaporated more easily than the case that the focal position was within the work surface. From the viewpoint of laser absorption by the wire or the molten droplet, according to an arc phenomenon approoach, it was found that about 10% of laser energy was absorbed during hybrid welding when the laser beam was directly irradiated on the wire surface.

アルミニウム合金のレーザ・MIGアークハイブリッド溶接における許容ギャップの拡大に関する研究

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