Journal of Jilin University(Engineering and Technology Edition) ›› 2022, Vol. 52 ›› Issue (1): 79-90.doi: 10.13229/j.cnki.jdxbgxb20200792

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Defects repair technology of SUS301L stainless steel laser weld

Wen-quan WANG1(),Yan-xin WANG1,Hong-xiao WANG2,Xin LI1(),Peng WU3   

  1. 1.College of Materials Science and Engineering，Jilin University，Changchun 130022，China
    2.CRRC Changchun Railway Vehicles Co. ，Ltd. ，Changchun 130021，China
    3.Changzhou Xuan?hao Machinery Co. ，Ltd. ，Changzhou 213000，China
  • Received:2020-08-23 Online:2022-01-01 Published:2022-01-14
  • Contact: Xin LI E-mail:wwq@mails.jlu.edu.cn;li_xin@jlu.edu.cn

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Abstract:

It is found that the assembly gap is inevitable in the welding process of the car body，especially in the manufacturing process of the large-size components such as the side walls of the vehicle body. In general，the existence of assembly gap will lead to quality problems，such as lack of fusion and surface forming，which is harmful to the static strength and fatigue strength of the weld. In this paper，laser welding was used to remelt and repair the surface collapse defect of laser weld，and the effects of laser power，welding speed and focusing distance on the surface quality and mechanical properties of repaired welds were studied. Furthermore，the orthogonal optimization test method was used to optimize the laser repair process parameters. The optimized parameters of laser repair process are as follows： laser power is 1.6 kW，welding speed is 3.81 m/min and focusing amount is 0 mm. The maximum tensile shear force of laser repaired weld is 16.3 kN，which is greater than that of the laser weld without defects，and the crystal grains of the laser repaired joint are not coarsened. The research shows that the laser repair technology can effectively repair the surface collapse of the laser weld and the tensile shear force of the repair weld can meet the technical requirements of the actual production. This technology can be applied to the actual production.

Key words: stainless steel sidewall, gap, weld repair, orthogonal optimization, tensile shear load

CLC Number: 

  • TG456.7

Fig.1

Dimensions of test plate used for laser lap welding"

Table 1

Laser repair process parameters"

P/kWv/（m·min-1）df/mm
1.23.810
1.33.810
1.43.810
1.53.810
1.63.810
1.43.610
1.43.710
1.43.910
1.43.81+5
1.43.81+10

Fig.2

Micro-morphology of normal weld and defective weld"

Fig.3

Cross-section morphology of repaired weld under different laser powers（v=3.81 m/min，df=0 mm）"

Fig.4

Columnar crystal morphology of repaired weld under different laser powers"

Fig.5

Effect of laser power on tensile-shear force、interface fusion width and lower plate weld depth of repaired weld"

Fig.6

Cross-section morphology of repaired weld under different welding speeds （P=1.4 kW，df=0 mm）"

Fig.7

Effect of welding speed on tensile-shear force、interface fusion width and lower plate weld depth of repaired weld"

Fig.8

Cross-section morphology of repaired weld under different focusing distances（P=1.4 kW，v=3.81 m/min）"

Fig.9

Columnar crystal morphology of repaired weld under different focusing distances"

Fig.10

Effect of focusing distance on tensile-shear load，interface fusion width and lower plate weld depth of repaired weld"

Fig.11

Tensile shear load-displacement curve of repaired weld fractured at interface"

Fig.12

SEM image of fracture surface morphology at interface"

Fig.13

Tensile shear load-displacement curve of repaired weld fractured at HAZ"

Fig.14

SEM image of fracture surface morphology at HAZ"

Table 2

Experimental program and results"

A

激光功率P/kW

B

焊接速度v/（m·min-1）

C

离焦量df/mm

F平均/kN
1（1）1.4（1）3.71（1）0（1）13
2（1）1.4（2）3.81（2）+5（2）15
3（1）1.4（3）3.91（3）+10（3）12
4（2）1.5（1）3.71（2）+5（3）12.2
5（2）1.5（2）3.81（3）+10（1）14.8
6（2）1.5（3）3.91（1）0（2）12.1
7（3）1.6（1）3.71（3）+10（2）13.2
8（3）1.6（2）3.81（1）0（3）16.3
9（3）1.6（3）3.91（2）+5（1）12.1

Table 3

Analysis of orthogonal test results"

方差来源偏差平方和S自由度方差F值临界值Fα显著性水平显著性
A1.068920.534417.179F0.1（2，2）=90.1*
B18.016029.0078289.540F0.01（2，2）=990.01***
C0.762220.381112.250F0.1（2，2）=90.1*
误差0.062220.0311
总和19.90938

Fig.15

Cross-section morphology of laser welds"

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