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JWJ > Volume 31(4); 2013 > Article
Journal of KWJS 2013 August;31(4) :7-12.
Published online August 31, 2013.
doi:https://doi.org/10.5781/KWJS.2013.31.4.7
Effects of the Types of Coating on the Laser Brazing Characteristics of Dissimilar Joints between Mg Alloy and Steel Sheet
Mok-Young Lee1, Sook-Whan Kim2, ALI M. NASIRI3, NORMAN Y. ZHOU3
1Advanced Metallic Materials Research Department, RIST, Pohang 790-330, Korea
2Energy Infra Research Department, RIST, Pohang 790-330, Korea
3Department of Mechanical & Mechatronics Engineering, University of Waterloo, Waterloo, ON, N2L 3G1, Canada
Correspondence: Mok-Young Lee  Email: accelee@rist.re.kr
  Published online August 31, 2013
ABSTRACT
The dissimilar welding between magnesium alloy and steel sheet was required in automobile industry to increase the strength of the dissimilar joints. Laser brazing is one of the good joining processes for Mgsteel dissimilar joint. In this study, the effect of coating materials was evaluated on the laser brazing for the dissimilar joint between AZ31 and coated steels such as Zn, Sn and Ni. Diode direct laser was used to braze the lap-edge joint with Mg600 filler wire and Superior #21 flux. The wettability was best on Zn coated steel. The interlayer was formed at the interface between brazement and steel for all coating materials. The strengths of brazed specimen were 146.5N/mm, 204.6N/mm and 101.6N/mm for Zn, Sn and Ni coated steel respectively.
Keywords: Mg alloy | Dissimilar joint | Coated steel sheet | Laser brazing | Diode direct laser
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