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采用双光束光纤激光焊接方法对特殊的十字交叉型接头进行焊接研究,从焊缝成形、力学性能和微观组织方面,系统研究了光斑排布方式和热输入对双光束激光焊接十字交叉型接头焊接特性的影响规律。试验结果表明,采用双光束激光焊接方法可成功实现十字交叉型接头的连接,获得成形良好、力学性能满足要求的接头。在热输入大于120kJ/m时可实现接合面的完全熔合,且串行排布时焊缝成形明显优于并行排布。接头抗拉强度随热输入的增大而增大;在热输入相同条件下,串行排布接头抗拉强度明显大于并行排布,在热输入约为140kJ/m时接头强度达到母材的96.5%。焊缝重熔区显微硬度高于未重熔区,这归因于重熔后焊缝中存在更多的针状δ铁素体。
The welding research of special cross-type joint was carried out by using double-beam fiber laser welding method. From the aspect of weld formation, mechanical property and microstructure, the welding arrangement of double-beam laser welding cross-type joint Characteristics of the law. The experimental results show that the double beam laser welding method can successfully achieve the cross-type connector connection, get good shape, mechanical properties to meet the requirements of the connector. When the heat input is more than 120kJ / m, the joint surface can be completely fused, and the weld formation in the serial arrangement is obviously better than the parallel arrangement. The tensile strength of the joint increases with the increase of heat input. Under the same heat input condition, the tensile strength of the serial arrangement joint is obviously greater than that of the parallel arrangement. When the heat input is about 140kJ / m, 96.5%. The microhardness of weld remelting zone is higher than that of non-remelting zone, which is attributed to the existence of more acicular δ-ferrite in the weld after remelting.