Low-Temperature Fracture Toughness of Laser-MAG Hybrid Welding Joint in Weather-Resistant Steel

Yong Chen; Hui Chen; Rendong Li; Xiaoli Che; Chengzhu Zhang

doi:10.3788/CJL201946.0702004

Chinese Journal of Lasers, Volume. 46, Issue 7, 0702004(2019)

Low-Temperature Fracture Toughness of Laser-MAG Hybrid Welding Joint in Weather-Resistant Steel

Yong Chen^*, Hui Chen^*, Rendong Li, Xiaoli Che, and Chengzhu Zhang

Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China

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$Schematic of specimen for fracture toughness test. (a) Sampling positions of specimen; (b) schematic of specimen dimensions and loading device$

Fig. 1. Schematic of specimen for fracture toughness test. (a) Sampling positions of specimen; (b) schematic of specimen dimensions and loading device

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Fig. 2. Fracture-toughness Jm of each zone in laser-MAG welding joint as a function of temperature. (a) BM; (b) WM; (c) HAZ

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$Micro-morphologies of fracture surfaces of BM specimen at different temperatures$

Fig. 3. Micro-morphologies of fracture surfaces of BM specimen at different temperatures

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$Micro-morphologies of fracture surfaces of WM specimen at different temperatures$

Fig. 4. Micro-morphologies of fracture surfaces of WM specimen at different temperatures

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$Micro-morphologies of fracture surfaces of HAZ specimen at different temperatures$

Fig. 5. Micro-morphologies of fracture surfaces of HAZ specimen at different temperatures

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Fig. 6. Microstructures and micro-hardness of different zones in laser-MAG hybrid welding joint. (a) Welding joint; (b) BM; (c) WM-laser zone; (d) WM-arc zone; (e) coarse grained zone; (f) fine grained zone; (g) incomplete normalized zone; (h) micro-hardness

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Fig. 7. Morphology of crack propagation path in different zones. (a) BM; (b) HAZ

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Table 1. Chemical compositions of SMA490BWweather-resistance steel and JM-55II welding wire
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Table 1. Chemical compositions of SMA490BWweather-resistance steel and JM-55II welding wire
Material Mass fraction /%
C Si Mn P S Cu Cr Ni Fe
SAM490BW ≤0.18 0.15-0.65 ≤1.40 ≤0.035 ≤0.035 0.30-0.50 0.45-0.75 0.05-0.30 Bal.
JM-55II 0.08 0.36 0.98 0.012 0.011 0.37 0.53 0.042 Bal.

Table 2. Process parameters of laser-MAG hybrid welding
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Table 2. Process parameters of laser-MAG hybrid welding
Welding No. Laser power /W Welding speed /(mm·s^-1) Wire feedingspeed /(m·min^-1) Arc current /A Welding voltage /V
1 4.0 10 7.5 240 24.8
2 1.0 13 9.0 275 27.4
3 1.0 13 9.0 270 27.2

Table 3. Parameters for ductile-to-brittle transition curves of each zone in laser-MAG hybrid welding joint
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Table 3. Parameters for ductile-to-brittle transition curves of each zone in laser-MAG hybrid welding joint
Welded zone J₁ /(kJ·m^-2) J₂ /(kJ·m^-2) T /℃ ΔT /℃ R²
BM 79.41 522.75 -81.95 7.96 0.983
WM 51.56 381.86 -65.99 13.65 0.991
HAZ 60.43 504.72 -70.42 5.73 0.992

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Yong Chen, Hui Chen, Rendong Li, Xiaoli Che, Chengzhu Zhang. Low-Temperature Fracture Toughness of Laser-MAG Hybrid Welding Joint in Weather-Resistant Steel[J]. Chinese Journal of Lasers, 2019, 46(7): 0702004

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Paper Information

Category: laser manufacturing

Received: Jan. 8, 2019

Accepted: Mar. 4, 2019

Published Online: Jul. 11, 2019

The Author Email: Yong Chen (xnrpt@swjtu.edu.cn), Hui Chen (xnrpt@swjtu.edu.cn)

DOI:10.3788/CJL201946.0702004

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of SMA490BWweather-resistance steel and JM-55II welding wire

Table 1. Chemical compositions of SMA490BWweather-resistance steel and JM-55II welding wire

Table 2. Process parameters of laser-MAG hybrid welding

Table 2. Process parameters of laser-MAG hybrid welding

Table 3. Parameters for ductile-to-brittle transition curves of each zone in laser-MAG hybrid welding joint

Table 3. Parameters for ductile-to-brittle transition curves of each zone in laser-MAG hybrid welding joint