Al matrix composites (AMCs) are preferred engineering materials for aerospace and automotive industries owing to their high specific strength, superior wear resistance and low thermal expansion. It is a challenge to achieve high-quality fusion welded joints of AMCs because of the occurrence of defects such as pores, particles segregation and acicular phases. In this study, the effects of laser welding parameters including laser power, welding speed and laser incident angle on the formation of porosity and acicular phase were investigated in SiC_p/6092 aluminum matrix composite welded joints using orthogonal experimental method. Range analysis of the orthogonal test results showed that the laser power and the welding speed had the greatest influence on the porosity and acicular phase size during the laser welding of aluminum matrix composites. At a heat input of 60 J/mm, the porosity in the weld was only 1.6% while that at 190 J/mm was 15.2%. Higher heat input produced a much larger size of brittle Al₄C₃ phases. The size of the acicular phase Al₄C₃ at the top and bottom of the weld was larger than that in the middle. Active Ti was added to the weld zone to mitigate the adverse effect of Al₄C₃ brittle phase and porosity on mechanical properties. The ultimate tensile strength increased from 115 MPa in direct laser welding to 148 MPa for the laser welding process employing the Ti interlayer. This work will provide referenceable data for designing high-quality AMC welded joints for aerospace and automotive industries.

铝基复合材料 (AMC) 是航空航天和汽车工业的首选工程材料，因为它们具有高比强度、优异的耐磨性和低热膨胀性。由于存在气孔、颗粒偏析和针状相等缺陷，实现高质量的AMC熔焊接头是一项挑战。_{本研究研究了激光功率、焊接速度和激光入射角等激光焊接参数对SiC p}中孔隙率和针状相形成的影响。/6092铝基复合材料焊接接头采用正交试验方法。正交试验结果的极差分析表明，激光功率和焊接速度对铝基复合材料激光焊接过程中的孔隙率和针状相尺寸影响最大。在 60 J/mm 的热输入下，焊缝中的气孔率仅为 1.6%，而在 190 J/mm 时为 15.2%。更高的热输入产生更大尺寸的脆性Al ₄ C ₃相。_{焊缝顶部和底部的针状相Al 4} C ₃尺寸大于中间。焊缝区加入活性Ti，减轻Al ₄ C _{3的不利影响}脆性相和孔隙率对力学性能的影响。极限抗拉强度从直接激光焊接的 115 MPa 增加到采用 Ti 中间层的激光焊接工艺的 148 MPa。这项工作将为航空航天和汽车行业设计高质量的 AMC 焊接接头提供参考数据。