Effect of Welding Speed on Bead Appearance and Low-Temperature Impact Toughness in Laser-Arc Hybrid Welding

Demin Zou; Jingang Qi; Lin Zhao; Yang Cao

doi:10.3788/CJL202249.0802014

Chinese Journal of Lasers, Volume. 49, Issue 8, 0802014(2022)

Effect of Welding Speed on Bead Appearance and Low-Temperature Impact Toughness in Laser-Arc Hybrid Welding

Demin Zou^1,2, Jingang Qi^2、**, Lin Zhao^1、*, and Yang Cao¹

Author Affiliations

¹Welding Institute, Central Iron & Steel Research Institute, Beijing 100081, China

²College of Materials Science and Engineering, Liaoning University of Technology, Jinzhou, Liaoning 121001, China

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Abstract Get PDF(in Chinese)

Figures & Tables(13)

Fig. 1. Laser-MIG hybrid welding system

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Fig. 2. Effect of welding speed on weld width and reinforcement

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Fig. 3. Formation of root humping during laser-arc hybrid welding

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Fig. 4. Effect of welding speed on impact absorbed energy of weld metal at －40 ℃

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Fig. 5. X-ray radiographs of welds at different welding speeds

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Fig. 6. Statistics of X-ray inspection of pores in welds at different welding speeds

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$Fracture morphologies of weld metal at welding speed of 0.8 m/min. (a) Macroscopic fracture morphology；(b) porosity; (c) cleavage fracture$

Fig. 7. Fracture morphologies of weld metal at welding speed of 0.8 m/min. (a) Macroscopic fracture morphology；(b) porosity; (c) cleavage fracture

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$Fracture morphologies of weld metal at welding speed of 1.2 m/min. (a) Macroscopic fracture morphology; (b)(c) dimples$

Fig. 8. Fracture morphologies of weld metal at welding speed of 1.2 m/min. (a) Macroscopic fracture morphology; (b)(c) dimples

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Fig. 9. Microstructures of weld metals (OM). (a) Welding speed of 1.2 m/min; (b) welding speed of 1.5 m/min；(c) welding speed of 1.8 m/min

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Fig. 10. Microhardness distribution of welded joints

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Table 1. Chemical composition of base metal and solder wire
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Table 1. Chemical composition of base metal and solder wire
Material Mass fraction /%
C Si Mn S P Ni Cr Mo Cu
Base metal 0.082 0.38 0.98 0.0017 0.0095 1.28 0.58 0.11
Solder wire 0.050 0.60 1.52 0.0029 <0.005 1.10 0.42 <0.01 <0.01

Table 2. Mechanical properties of base metal
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Table 2. Mechanical properties of base metal
Mechanical property Value
Yield strength /MPa 455
Ultimate tensile strength /MPa 582
Elongation /% 28
Impact absorbed energy at －40 ℃/J 96

Table 3. Surface appearances and cross-sections of weld at different welding speeds
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Table 3. Surface appearances and cross-sections of weld at different welding speeds
No. Welding speed /(m·min^－1) Weld appearance Weld cross-section
1 0.8
2 1.0
3 1.2
4 1.5
5 1.8

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Demin Zou, Jingang Qi, Lin Zhao, Yang Cao. Effect of Welding Speed on Bead Appearance and Low-Temperature Impact Toughness in Laser-Arc Hybrid Welding[J]. Chinese Journal of Lasers, 2022, 49(8): 0802014

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