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CHEN Genyu, ZHANG Yan, LEI Ran. Testing of hot crack using laser-MAG combined welding for 42CrMo steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 61-66. DOI: 10.12073/j.hjxb.2019400182
Citation: CHEN Genyu, ZHANG Yan, LEI Ran. Testing of hot crack using laser-MAG combined welding for 42CrMo steel[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2019, 40(7): 61-66. DOI: 10.12073/j.hjxb.2019400182
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Testing of hot crack using laser-MAG combined welding for 42CrMo steel

  • 1.

    State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China

  • 2.

    Hunan Institute of Science and Technology, Yueyang 414006, China

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  • Received Date: January 20, 2018
    Graphical Abstract
    • Abstract
  • The welding processes of transient flow and solidification behaviors were observed using high speed camera. The moving velocity of the interface between solids and liquids was calculated. The temperature variation of welding process was obtained by infrared thermal imager and the temperature gradient was calculated. The hot crack tendency of welded joint was investigated under three welding process of autogenous laser welding, laser-MAG hybrid welding guided by laser and laser-arc hybrid welding guided by arc. The results show laser-MAG hybrid welding guided by laser produced the lower moving velocity of solids and liquids, the lower temperature gradient, and smaller strain rate and sensitivity of hot crack. The microstructure and hardness were also tested in laser-MAG hybrid welding guided by laser.
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    • References (9)
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