Journal of Mechanical Engineering >

2017 , Vol. 53 >Issue 22: 87 - 94

DOI: https://doi.org/10.3901/JME.2017.22.087

Study on the Impact of the Shielding Gas on the Droplet Transfer Mode and Blowhole Defect of High Nitrogen Steel Welding

  • CUI Bo ,
  • ZHANG Hong ,
  • LIU Jia ,
  • LIU Fengde ,
  • ZHANG Fulong
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  • 1. College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun 130022;
    2. College of Automible and Civil Engineering, Beihua University, Jilin 132013;
    3. Engineering Research Center of Laser Processing for Universities of Jilin Province, Changchun University of Science and Technology, Changchun 130022;
    4. National Base of International Science and Technology Cooperation in Optics, Changchun University of Science and Technology, Changchun 130022

Received date: 2017-03-13

  Revised date: 2017-09-12

  Online published: 2017-11-20

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Abstract

High-nitrogen steel plates with a thickness of 8 mm are welded with a laser-arc composite heat source for experiment to study the impact of different shielding gas compositions on the welding joint profile, droplet transfer features and blowhole defect. The results show that when the pure argon is used as the shielding gas, the droplet transfer mode is mainly shown as spray transfer, accompanied by a small amount of repulsion transfer. When the shielding gas is mixed by Ar+N2, the droplet transfer mode is short circuiting transfer; when the shielding gas is mixed by Ar+N2+O2, the droplet transfer mode is spray transfer. The shielding gas composition has some impact on the blowhole defect of the welding joint. When the shielding gas is pure argon, the blowhole defect rate of the welding joint is at its maximum and its value is 2.52%. When the shielding gas is 90% Ar+10% N2, the blowhole defect rate is the lowest, only 0.16%; when 1% of the O2 is added to the mixture of Ar+N2, the blowhole defect rate slightly rises, but compared with that of pure argon, the blowhole defect rate still drops significantly. When the ternary mixture of Ar+N2+O2 is used as the shielding gas, the number of blowholes in the welding joint can be effectively contained, and the droplet transfer mode can be improved to better the stability of the welding process.

Key words： hybrid welding; high nitrogen steels; shielding gas; welding porosity; droplet transfer

Cite this article

CUI Bo , ZHANG Hong , LIU Jia , LIU Fengde , ZHANG Fulong . Study on the Impact of the Shielding Gas on the Droplet Transfer Mode and Blowhole Defect of High Nitrogen Steel Welding[J]. Journal of Mechanical Engineering, 2017 , 53(22) : 87 -94 . DOI: 10.3901/JME.2017.22.087

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