METHOD OF LASER WELDING METAL PLATED PLATES
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United States of America Patent
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app pub date -
Sep 11, 2008
filing date -
Apr 24, 2008
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Abstract
The invention provides a method of laser welding zinc plated steel plates which surely realizes excellent welding without a melting defect such as blowholes. By irradiating a line on a superposed portion of a lower plate and an upper plate with a first laser beam having a high energy density and a small irradiation region by moving the first laser beam therealong, steel plate portions in the small irradiation region are melted and zinc on the superposed surfaces around the small irradiation region including in the small irradiation region is evaporated and allowed to escape outside. Then, after the irradiation with the first laser beam, the same line is irradiated with a second laser beam having a lower energy density than the first laser beam and a larger irradiation region than the first laser beam by moving the second laser beam therealong to melt steel plate portions in the larger irradiation region, thereby completing weldbonding.
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