Journal
ISIJ INTERNATIONAL
Volume 49, Issue 2, Pages 270-274Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.49.270
Keywords
magnesium alloy AZ91D; MIG arc welding; solidification cracking; liquation cracking
Categories
Funding
- Changchun and Jilin Province Committees of Science and Technology of China
Ask authors/readers for more resources
The microstructure and cracking characteristics of MIG welded magnesium alloy (AZ91D) joint, and the effect of welding speed on cracking susceptibility have been investigated. The welded joint consists of primary alpha-Mg and divorced phases (eutectic alpha-Mg+eutectic beta-Mg(17)Al(12)), the latter mainly distributing along the alpha-Mg grain boundaries. Solidification cracking often occurred in the crater and was also observed at weld center line when welding speed was 300 mm/min, which are associated with segregation of Mn, Al and Zn and high tensile stresses in the welds. Liquation cracking appeared in HAZ immediately adjacent to the fusion line when low welding speed was used (300 mm/min). It is mainly related to the low welding speed resulting in increasing heat input and tensile stresses in the HAZ. It is favorable to decrease heat input for improving the susceptibility of hot cracking during MIG welding of magnesium alloys.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available