针对油田用承压不锈钢管材, 选用1Cr17Mn6Ni5N不锈钢(16Cr不锈钢)钢板进行激光焊和高频焊焊接试验。采用OM、SEM观察焊缝的宏观形貌、显微组织, 测试焊接接头的力学性能。结果表明, 激光焊焊缝成型良好, 显微组织均匀, 硬度与母材差别不大, 弯曲性能良好, 抗拉强度为701 MPa; 高频焊焊缝存在错边, 显微组织不均匀, 铁素体含量高, 焊缝硬度高于母材60 HV, 弯曲时焊缝开裂, 抗拉强度为679 MPa。由此可见, 采用激光焊焊接16Cr不锈钢更能获得良好的焊接接头, 因此选择激光焊焊接方法继续进行工艺研究。

For the pressure-bearing stainless steel pipe for oil field, the laser welding and high-frequency welding test are carried out using 1Cr17Mn6Ni5N stainless steel (16Cr stainless steel) steel plate. The macroscopic morphology and microstructure of the weld were observed by OM and SEM, and the mechanical properties of the welded joint were tested. The results show that the laser weld has good weld formation, uniform microstructure, little difference between hardness and base metal, good bending performance and resistance. The tensile strength is 701 MPa. The high-frequency welding seam has the wrong side, the microstructure is not uniform, the ferrite content is high, the weld hardness is higher than the base metal 60 HV, the weld is cracked during bending, and the tensile strength is 679 MPa. It can be seen that laser welding of 16Cr stainless steel can obtain a good welded joint, so the laser welding method is selected to continue the process research.