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Journal of KWJS 2011;29(1):90-98.
Published online March 4, 2011.
Al-Si Coated Boron Steel과 Zn Coated DP Steel 이종금속의 DISK Laser 용접부 미세조직과 경도
YongGyu An, ChungYun Kang, YoungSu Kim, CheolHee Kim, TaeKyo Han
Abstract
  Al-Si coated Boron steel and Zn coated DP steel were welded using DISK laser and the microstructure and hardness of the weld were investigated. Full penetration was obtained, when the welding speed was lower than 4m/min. In the specimen welded with laser power of 3 ㎾ and welding speed of 2 m/min, the hardness was the highest in the heat affect zone in the boron steel (HAZ-B) and that of the heat affect zone in the DP steel (HAZ-D) was lower than HAZ-B. The hardness of fusion zone was in between those of HAZ-B and HAZ-D. The decreased hardness from each HAZ to base metal(BM) could be explained that ferrite contents increases when access to the BM. The variation of hardness in the welds could be explained by the difference of microstructure, that is, full martensite in HAZ-B, mixture of martensite and bainite in the fusion zone, and the mixture of martensite, ferrite and bainite in HAZ-D.
Key Words: Al-Si coated Boron Steel, Zn coated DP steel, Laser welding, Microstructure, Hardness
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