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研究了不同工艺参数下低合金高强钢激光穿透焊T型接头的宏观形貌、微观组织、显微硬度和扭转性能。结果表明:在一定的激光功率下,控制焊接热输入使其略高于深熔焊阈值2.4kJ/cm,可获得适宜的熔深和结合区宽度。焊缝组织为方向性明显的低碳板条马氏体,垂直熔合线向焊缝中心生长,硬度约为320HV。热影响区宽度约为1mm,组织细小,存在较多的粒状贝氏体。结合区宽度越宽,T型接头所能承受扭矩越大。
The macroscopic morphology, microstructure, microhardness and torsion properties of T-shaped joints of low alloy and high strength steel for laser penetration welding under different technological parameters were studied. The results show that under a certain laser power, the welding heat input can be controlled slightly higher than 2.4 kJ / cm, and the suitable penetration depth and the width of the bonding area can be obtained. Weld microstructure of the obvious orientation of low-carbon lath martensitic, vertical fusion line to the weld center growth, hardness of about 320HV. Heat affected zone width of about 1mm, small organization, there are more granular bainite. The wider the width of the bond area, the greater the torque that the T-connector can bear.