A Study on the Weldability of Magnesium Alloy by Laser Heat Source (Ⅱ)
- Mechanical Properties of laser-welded AZ31B-H24 and AZ31B-O -

Lee, Jung-Han; Kim, Jong-Do; Lee, Mun-Yong

doi:2012.30.6.56

J Weld Join > Volume 30(6); 2012 > Article

Research Paper

Journal of KWJS 2012;30(6):56-61.
DOI: https://doi.org/10.5781/KWJS.2012.30.6.56 Published online December 23, 2012.

A Study on the Weldability of Magnesium Alloy by Laser Heat Source (Ⅱ) - Mechanical Properties of laser-welded AZ31B-H24 and AZ31B-O -

Jung-Han Lee^*, Jong-Do Kim^**, Mun-Yong Lee^*

Correspondence: Mun-Yong Lee,
Email: jdkim@hhu.ac.kr

Abstract

Magnesium alloy sheet which is commercially available in the market presently is AZ31B, a Mg-Al-Zn three elements alloy. AZ31B is used by being classified into AZ31B-H24 and AZ31B-O depending on temper designation. In this study, AZ31B-H24 and AZ31B-O alloy sheets with 1.25mm thickness were butt-welded using CW Nd:YAG laser. And the effect of materials on mechanical properties was investigated by tensile and hardness tests. As a result of this study, regardless of materials, the butt-welded joint did not show a significant difference in tensile strength and hardness values. However, compared with the basemetal, the AZ31B-O showed more outstanding mechanical properties than AZ31B-H24, and that is because H24 material lost the effect of work hardening during welding.

Key Words: AZ31B-H24, AZ31B-O, Nd:YAG laser, Butt welding, Mechanical property