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庞铭, 郑彩云, 刘秀波, 虞钢. K418与42CrMo异种金属激光深熔焊接[J]. 焊接学报, 2007, (9): 83-86.
引用本文: 庞铭, 郑彩云, 刘秀波, 虞钢. K418与42CrMo异种金属激光深熔焊接[J]. 焊接学报, 2007, (9): 83-86.
PANG Ming, ZHENG Caiyun, LIU Xiubo, YU Gang. Deep penetration laser welding dissimilar metal of K418 and 42CrMo[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (9): 83-86.
Citation: PANG Ming, ZHENG Caiyun, LIU Xiubo, YU Gang. Deep penetration laser welding dissimilar metal of K418 and 42CrMo[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2007, (9): 83-86.

K418与42CrMo异种金属激光深熔焊接

Deep penetration laser welding dissimilar metal of K418 and 42CrMo

  • 摘要: 研究了连续波Nd:YAG激光焊接功率、速度、离焦量和侧吹保护气流量对激光深熔焊接K418与42CrMo异种金属焊缝形貌、焊缝熔深的影响,讨论了焊缝区热裂纹产生机制。结果表明,额定功率为3 kW的Nd:YAG激光深熔焊接K418与42CrMo异种金属,由于它们的物理化学性质的差异,焊缝靠近42CrMo侧易出现未熔合;激光光斑向42CrMo侧偏移可以减少焊缝靠近42CrMo侧未熔合量;通过优化侧吹保护气流量和离焦量可以增加熔深。由于K418液态金属的流动性差,导致焊缝靠近K418侧对流传热不充分,使焊缝靠近K418侧熔合线呈现锯齿形。焊缝区热裂纹的产生主要是由于焊缝区元素偏析形成的低熔物导致。

     

    Abstract: The influences of laser power, welding velocity, defocusing distance and flow rate of side-blow shielding gas on shape of weld, and weld penetration of laser deep penetration welding of dissimilar metal K418 and 42CrMo were experimentally investigated using continuous wave (CW) Nd:YAG laser.Mechanism of hot crack formation of weld zone was analyzed.Results show that lack fusion between weld and 42CrMo interface is observed due to difference of theirs physical and chemical properities.Offset of laser beam toward 42CrMo can abate lack fusion between weld and 42CrMo interface.The serrate shape is observed between weld seam and K418 interface due to not full convection heat transfer.Weld penetration can be increased by optimization flow rate of side-flow shielding gas and defocusing distance.The main cause of hot crack in the weld zone of dissimilar metal of K418 and 42CrMo laser welding is the segregation of the element and the forming of low-melting phases over grain boundaries.

     

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