Effect of laser welding parameters on microstucture and mechanical properties of C-276/304 overlapping weld

ZHOU Si-yu; MA Guang-yi; CHAI Dong-sheng; YU Jing-ling; CHENG Bo; WU Dong-jiang

doi:10.3788/OPE.20172513.0135

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Effect of laser welding parameters on microstucture and mechanical properties of C-276/304 overlapping weld

更新时间：2020-08-13

- Effect of laser welding parameters on microstucture and mechanical properties of C-276/304 overlapping weld
- Optics and Precision Engineering Vol. 25, Issue 10s, Pages: 135-143(2017)
- 作者机构：
  
  大连理工大学精密与特种加工教育部重点实验室,辽宁大连,116024
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20172513.0135
  CLC： TG456.7
- Received：27 May 2017，
  
  Revised：29 June 2017，
  
  Published：25 November 2017
- 稿件说明：
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周思雨, 马广义, 柴东升等. 激光焊接参数对C-276/304搭接焊缝组织及力学性能的影响[J]. 光学精密工程, 2017,25(10s): 135-143

ZHOU Si-yu, MA Guang-yi, CHAI Dong-sheng etc. Effect of laser welding parameters on microstucture and mechanical properties of C-276/304 overlapping weld[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 135-143
周思雨, 马广义, 柴东升等. 激光焊接参数对C-276/304搭接焊缝组织及力学性能的影响[J]. 光学精密工程, 2017,25(10s): 135-143 DOI： 10.3788/OPE.20172513.0135.

ZHOU Si-yu, MA Guang-yi, CHAI Dong-sheng etc. Effect of laser welding parameters on microstucture and mechanical properties of C-276/304 overlapping weld[J]. Editorial Office of Optics and Precision Engineering, 2017,25(10s): 135-143 DOI： 10.3788/OPE.20172513.0135.

摘要

为实现CAP1400核主泵屏蔽套端部的可靠密封，采用Nd：YAG脉冲激光对C-276哈氏合金与奥氏体不锈钢304进行异质材料的搭接焊接。采用光学显微镜及扫描电子显微镜观测焊缝形貌及微观组织，运用能谱仪检测焊缝内的元素成分，利用电子探针测量焊缝内的元素分布，通过机械撕裂实验评价焊接接头的力学性能。机械撕裂实验结果指出，不同脉冲能量下，断裂均发生于焊缝，且为拉伸断裂形式，当脉冲能量为3~4 J时，焊缝抗机械撕裂强度达到最大，约为78 N/mm。优化的焊接参数范围为：脉冲能量3~4 J、焊接速度125~200 mm/min、脉冲频率30 Hz、脉宽6~8 ms、离焦量-1~0 mm。结果表明，脉冲能量和脉冲频率对搭接焊缝结合宽度影响较大，但过大脉冲能量及脉冲频率、过小脉冲宽度会造成焊缝表面的塌陷及严重飞溅。随着脉冲能量的增大，304母材未熔合区宽度下降，焊缝内析出相含量降低。在较高的脉冲能量下，焊缝内柱状晶及等轴晶组织粗化，由元素烧蚀导致的微孔数量及尺寸较大。随着304母材在焊缝内稀释率的提高，焊缝内的元素含量与304母材的差异缩小，焊缝内的元素分布均匀程度降低。

Abstract

In order to realizereliable seal welding at the end of CAP1400 nuclear reactor coolant pimp can

Nd:YAG pulsed laser was adopted to implement overlapping weld of dissimilar materials of Hastelloy C-276 and austenite stainless steel 304. Optical microscope and scanning electron microscope were adopted to observe morphology and microstructure of the weld metal. EDS was used to detect elementary composition in weld

electron probe was used to measure element distribution in weld and mechanical property of welded joint was evaluated by mechanical tearing experiment. Result of mechanical tearing experiment indicates that fracture occurs in weld under different plus energy

and it is tension fracture. When plus energy is 3-4 J

mechanical tearing resistance strength of weld reaches the maximum and is about 78 N/mm. Optimized weld parameter scopes are:pulse energy 3-4 J

welding speed 125-200 mm/min

pulse frequency 30 Hz

pulse width 6-8 ms

and defocusing amount -1-0 mm. The result shows that the effect of pulse energy and pulse frequency on joint width of overlapping weld is relatively large

but excessively large pulse energy and pulse frequency and excessively small pulse width will cause collapse and serious spatter of weld surface. Along with increase of pulse energy

width of incomplete fusion zone in the side of 304 parent material decreases

content of precipitated phase in weld is reduced. Under relatively high pulse energy

columnar crystal and equiaxed structure in weld coarsen

quantity and size of micropore caused by element ablation is relatively large. Along with improvement of dilution rate of 304 parent material in weld

difference between element content and 304 parent material in weld is reduced

and uniformity of element distribution in weld decreases.

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references

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