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SUPPRESSING LASER-INDUCED PLUME FOR LASER EDGE WELDING OF ZINC COATED STEELS
SUPPRESSING LASER-INDUCED PLUME FOR LASER EDGE WELDING OF ZINC COATED STEELS
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机译:抑制锌包钢激光边缘焊接的激光诱导焊缝
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摘要
A system and method for stabilizing the molten pool in a laser welding operation by suppressing a laser-induced plume which occurs when zinc coated steels are laser welded. The plume is a result of vaporization of zinc, and the zinc vapor in the plume disturbs the molten pool and causes blowholes, spattering and porosity. The stabilization is achieved by applying a gas such as air through a nozzle to the weld area, where the gas has sufficient velocity and flow rate to blow the zinc vapor away from the molten pool. Dramatically improved weld quality results have been demonstrated. Configuration parameters which yield optimum results—including gas flow rate and velocity, and nozzle position and orientation relative to the laser impingement location on the steel—are disclosed.
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