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Lap fillet joints were fabricated in 7075 aluminum alloy (AA 7075) sheets using laser wobbling patterns and compared with similar joints fabricated using a static beam. Quasi-static tensile testing, c...ross-sectional microscopy, and high-speed camera observations were conducted to compare the performances of the different joints. Application of wobbling increased the bead width and also increased the window for laser welding parameters for welds with high static tensile strength when compared with the static mode without oscillation. In the circular oscillation pattern case, solidification cracking occurred for negative offset values (i.e., in the direction away from the upper plate), whereas zero solidification cracking occurred over the entire weld line when a wobble with a flower pattern was used. The resulting calculated energy distribution over the surface indicates that the flower pattern provides a relatively uniform energy distribution over the wobbling oscillation amplitude range when compared with the static mode or the circle pattern wobbling mode. The bead surface obtained behind the laser irradiation position was smoother when using the flower pattern rather than a circle pattern. The flower pattern distributes the heat that is input to the molten region more uniformly than the circle pattern; this leads to a lower temperature gradient, which appears to suppress hot cracking.続きを見る
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