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采用15 kW CO2激光器对1.8 mm厚的热镀锌薄板B450LAD进行了高功率激光焊接。对工艺优化后所得到的4组焊接工艺规范参数的焊接接头进行宏观与微观组织分析、显微硬度试验以及拉伸力学性能试验。结果表明,在激光功率5.8~12.9 kW以及焊接速度3~7 m/min参数下,1.8 mm厚B450LAD镀锌钢板均可获得成形良好、无缺陷的焊缝;焊缝截面呈上宽下窄的倒梯形,热影响区(HAZ)相当窄;焊缝熔化区组织均为马氏体、细晶区组织为少量马氏体和铁素体;其焊缝中心显微硬度约为母材(BM)的2倍;焊接接头具有良好的拉伸力学性能,且4种拉伸试样均断于母材处。实验的4组工艺参数可作为此钢材不同应用场合下高功率激光焊接的工艺参考。
A 1.8 kW thick, hot-dip galvanized sheet B450LAD was laser welded using a 15 kW CO2 laser. After optimization of the process, four groups of welding process parameters obtained by the welding joint macro and micro microstructure analysis, microhardness test and tensile mechanical properties of the test. The results show that a 1.8mm thick B450LAD galvanized steel sheet can be obtained with well-formed and defect-free welds with a laser power of 5.8-12.9 kW and a welding speed of 3-7 m / min. Inverted trapezoid and heat affected zone (HAZ) are quite narrow. The weld zone is martensite in the melt zone and a small amount of martensite and ferrite in the zone. The microhardness of the weld center is about ) 2 times; welded joints have good tensile mechanical properties, and 4 kinds of tensile specimens were broken at the base metal. The experimental set of 4 process parameters can be used as a reference for high power laser welding of different applications of this steel.