Formation Regularity of Pores During Laser Welding of Die-Cast Magnesium Alloys and Its Mechanism

Jing, 张婧 Zhang; Jiguo, 单际国 Shan; Peng, 温鹏 Wen; Jialie, 任家烈 Ren

doi:10.3788/cjl201138.0603006

中国激光

2011

DOI: 10.3788/cjl201138.0603006

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Formation Regularity of Pores During Laser Welding of Die-Cast Magnesium Alloys and Its Mechanism

张婧 Zhang Jing¹,

单际国 Shan Jiguo²,

温鹏 Wen Peng³

et al.

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Study on Hereditary of Pores in Laser Remelting of Die Casting Az91d Magnesium Alloy

Siyuan¹

2012

Acta Metallurgica Sinica

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Porosity has been a main problem for die casting magnesium alloy welding and casting defect repair. In order to study the formation mechanism of pores in fusion welding of die casting magnesium alloy, in this research, experiment of die casting AZ91D magnesium alloy CO 2 laser re-melting was carried out. OM and SEM were employed to observe the characteristics of pores existing at both the base metal and re-melted zone, and a software for particle size analysis called nano measure 1.2 was adopted to measure the pores' size. During analysis, the work mainly focused on the relationship of pores in re-melted zone associated with that preexisting in the base metal. The results showed that: porosity in die cast magnesium alloy base metal showed apparently hereditary characteristic in the process of re-melting. Porosity preexisting in the die casting AZ91D magnesium alloy was mainly produced at the junction region of multi-grains, with high pressure of inner gas, small size and irregularity in shape. However, pores in the re-melting zone showed diversity. Specifically, the micro-pore was small in size, nearly round in cross section and smooth in the inner wall, which was induced by hydrogen stored in the base metal. The macro-pores were vermiculate, with gas channel and metal erosion traces at the inner wall. It's considered that the micro-pore was mainly inherited from the atomic hydrogen solution in the base metal and molecular hydrogen stored in the die casting defects.

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Study on Hereditary of Pores in Laser Remelting of Die Casting Az91d Magnesium Alloy

Siyuan¹

2012

Acta Metallurgica Sinica

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Formation Regularity of Pores During Laser Welding of Die-Cast Magnesium Alloys and Its Mechanism

Cited by 1 publication

References 0 publications

Study on Hereditary of Pores in Laser Remelting of Die Casting Az91d Magnesium Alloy

Study on Hereditary of Pores in Laser Remelting of Die Casting Az91d Magnesium Alloy

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