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采用高功率光纤激光对核级316LN不锈钢板材进行填丝堆焊工艺研究,焊材选用Inconel690镍基焊丝,并在最优工艺参数下,对槽型模拟缺陷进行了补焊修复。结果表明:在合理的工艺参数条件下堆焊层成形效果良好,其中,采用激光功率为4 k W、堆焊速度为8 mm/s、送丝速度为2.4 mm/s的工艺参数组对槽型模拟缺陷进行修复,补焊效果良好。修复试样抗拉强度与伸长率为544.56 MPa和44.49%,分别为母材的86.3%和81.63%。焊缝与母材结合区无明显硬化,侧弯试验PT检测无缺陷。堆焊层的显微组织为外延生长的柱状树枝晶,晶粒细小、均匀。
High-power fiber laser was used to study the filler wire surfacing process of 316LN stainless steel. The Inconel690 nickel-base welding wire was selected as the welding consumables, and the repair of the groove type simulated defects was repaired under the optimal process parameters. The results show that the formation of surfacing layer is well under the reasonable technological parameters. Among them, the technological parameter group with laser power of 4 k W, surfacing speed of 8 mm / s and wire feeding speed of 2.4 mm / Type simulation defect repair, repair welding effect is good. The tensile strength and elongation of the repaired samples were 544.56 MPa and 44.49%, which were respectively 86.3% and 81.63% of the base metal. There is no obvious hardening in the joint area between the weld seam and the base metal, and the flaw test PT test has no defects. Surfacing layer microstructure for the epitaxial growth of columnar dendrites, small and uniform grains.