Study on High Power Oscillating Laser Self-fusion Welding of 12 mm Thick 304L

LIU Peng; WANG Yanjun; REN Wenjie; ZHANG Xiaodong; HU Yu; SUN Liuqing; YANG Shanglu

doi:10.7512/j.issn.1001-2303.2023.07.04

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Study on High Power Oscillating Laser Self-fusion Welding of 12 mm Thick 304L
Vol. 53, Issue 7, Pages: 24-30(2023)
DOI： 10.7512/j.issn.1001-2303.2023.07.04

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刘鹏，王艳俊，任闻杰，等.12 mm厚304L高功率摆动激光自熔焊工艺研究［J］.电焊机，2023，53（7）：24-30.

LIU Peng, WANG Yanjun, REN Wenjie, et al.Study on High Power Oscillating Laser Self-fusion Welding of 12 mm Thick 304L[J].Electric Welding Machine, 2023, 53(7): 24-30.
刘鹏，王艳俊，任闻杰，等.12 mm厚304L高功率摆动激光自熔焊工艺研究［J］.电焊机，2023，53（7）：24-30. DOI： 10.7512/j.issn.1001-2303.2023.07.04.

LIU Peng, WANG Yanjun, REN Wenjie, et al.Study on High Power Oscillating Laser Self-fusion Welding of 12 mm Thick 304L[J].Electric Welding Machine, 2023, 53(7): 24-30. DOI： 10.7512/j.issn.1001-2303.2023.07.04.

摘要

对12 mm厚304L不锈钢进行高功率摆动激光自熔焊接工艺试验，研究焊接速度、摆动频率、摆动幅度对焊缝宏观形貌和微观组织的影响规律。结果表明：当激光功率为9.5 kW、激光无摆动时，焊接速度从0.9 m/min增加至1.5 m/min，焊缝从熔透变为未熔透，未熔透试样的表面飞溅明显；当摆动频率在50~400 Hz范围内，随着摆动频率的增加，焊缝熔宽由6.67 mm单调减小至4.94 mm，而熔深在7.5 mm附近上下浮动；当焊接速度为0.9 m/min，摆动幅度在0.2~1.0 mm范围内，随着摆动幅度增加，焊缝的熔宽由5.36 mm单调增加至7.14 mm，熔深先增加后减小；当焊接速度为0.72 m/min，摆动幅度在0.5~1.0 mm范围内，随着摆动幅度增加，焊缝的熔宽由2.99 mm单调增加至7.73 mm，熔深由12 mm单调减小至8.42 mm。激光的摆动参数对焊缝熔宽的影响规律较焊缝熔深的更明显。焊缝接头的显微组织在焊缝深度方向存在差异，柱状晶主要分布在焊缝上部和中部，焊缝底部主要为等轴晶。激光束摆动会改变焊缝柱状晶和等轴晶在焊缝上部和中部的分布。

Abstract

The effects of welding speed, oscillating frequency and oscillating amplitude on the macro-morphology and microstructure of the weld were studied by high power oscillating laser self-fusion welding of 12mm thick 304L stainless steel. The results show that when the laser power is 9.5 kW and the laser does not oscillate, as the welding speed increases from 0.9 m/min to 1.5 m/min, the weld changes from penetrated to unpenetrated, and the spattering of the unpenetrated specimen is obvious. When the oscillating frequency is in the range of 50~400 Hz, with the increase of the oscillating frequency, the penetration width of the weld decreases from 6.67 mm monotonic to 4.94 mm, and the penetration depth fluctuates up and down around 7.5 mm. When the welding speed is 0.9 m/min and the oscillating amplitude is in the range of 0.2~1.0 mm, with the increase of the oscillating amplitude, the penetration width of the weld increases monotonically from 5.36 mm to 7.14 mm, and the penetration depth first increases and then decreases. When the welding speed is 0.72 m/min and the oscillating amplitude is in the range of 0.5~1.0 mm, with the increase of the oscillating amplitude, the penetration width of the weld increases from 2.99 mm monotonic to 7.73 mm, and the penetration depth decreases from 12 mm monotonic to 8.42 mm. The influence of the oscillating parameters of the laser on the penetration width is more obvious than that of the penetration depth. The microstructure of the weld joint is different in the direction of weld depth, the columnar crystals are mainly distributed in the upper and middle parts of the weld, and the bottom of the weld is mainly equiaxed crystals. Laser beam oscillating changes the distribution of columnar and equiaxed crystals in the upper and middle weld.

关键词

奥氏体不锈钢中厚板摆动激光焊显微组织

Keywords

austenitic stainless steelmid-thick platesoscillating laser weldingmicrostructure

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