JOURNAL OF SHANDONG UNIVERSITY (ENGINEERING SCIENCE) ›› 2015, Vol. 45 ›› Issue (3): 73-79.doi: 10.6040/j.issn.1672-3961.0.2014.225

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The property of die-casting dies of wiper repaired by laser welding with filler wire

LIU Lijun1, ZHANG Hongxing1,2, ZHANG Weijie1,2, WANG Gang1,3, QI Meng1,2   

  1. 1. Ningbo Institute of Technology, Zhejiang University, Ningbo 315100, Zhejiang, China;
    2. College of Mechanical Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, Shanxi, China;
    3. College of Material Science & Engineering, Harbin University of Science and Technology, Harbin 150080, Heilongjiang, China
  • Received:2014-08-21 Revised:2015-03-18 Published:2014-08-21

Abstract: In order to solve the problem of cracks on die-casting dies, the method of combining laser technology and bionic technology was used to repair them. Repairing layer on die-casting dies was prepared utilizing the method of laser wire filling welding; the optimal process parameters were obtained through the microstructure observation, hardness analysis and energy-dispersive X-ray analysis. These parameters were that the current was 180 A, the defocusing amount was -10 mm, the laser pulse width was 8 ms, the wire filling speed was 0.032 m/min, and thermal fatigue test and life test of die-casting dies were performed using these parameters. The experimental results showed that hardness of die-casting dies surface were improved, tissue grain was refined effectively, and the life of mold was extended, which could provide a new thought for repairing the die-casting dies.

Key words: laser welding, welding with filled wire, microstructure characteristics, thermal fatigue, laser techniques, die-casting dies

CLC Number: 

  • TG174
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