吉林大学学报(工学版) ›› 2015, Vol. 45 ›› Issue (1): 181-186.doi: 10.13229/j.cnki.jdxbgxb201501027

• Orignal Article • Previous Articles     Next Articles

Butt-welding process of laser-MAG hybrid welding of 16 mm S355J2W+N steel plates

ZHEN Shu1,2,SUN Da-qian1,GAO Dan-dan1,DUAN Zhen-zhen2   

  1. 1.College of Materials Science and Engineering, Jilin University, Changchun 130022,China;
    2.Changchun Railway Vehicles Co., Ltd, Changchun 130062, China
  • Received:2013-09-16 Online:2015-02-01 Published:2015-02-01

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Abstract: The effects of laser power and welding current on the appearance of weld, the microstructures and mechanical properties of welded joint were studied by CLSM, SEM, microhardness tester and universal tensile tester. The results show that laser power and welding current greatly promote the weld penetration. Laser power has no obvious influence on the weld width except that the weld is "bread twist" like when the laser power is relatively low. The multi-layer hybrid weld is goblet-shaped and there are a small amount of pores within the weld metal. The formation of the pores has nothing to do with the gasification of element Mn in the base metal and filler metal. Obvious necking emerges in the base metal zone where fracture happens during the tensile test. Furthermore, the fracture appearance has a typical characteristic of plastic deformation.

Key words: materials synthesis and processing technology, characteristics of welded joint, laserMAG hybrid welding, S355J2W+N, weld appearance

CLC Number: 

  • TG456.9
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