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Laser welding of AZ31B magnesium alloy to Zn-coated steel
Highlights ► Magnesium alloy was successfully laser welded to Zn-coated steel. ► The joint strength exceeded 6000N on a 25mm wide specimen. ► A 450nm thick layer of Fe3Al was uniformly formed on the steel surface.
Abstract The characteristics of laser lap welding of AZ31B magnesium alloy to Zn-coated steel were investigated. Welding was difficult when the laser beam was irradiated onto the AZ31B alloy and the processing parameters were set to obtain a keyhole welding mode. The difference in the physical properties between the two materials resulted in unstable welding process particularly when the laser beam penetrated into the steel specimen and a keyhole was formed therein. By switching to a conduction mode, the process stability was improved and successful welding could be achieved because the liquid metal film remained unbroken and the laser beam did not penetrate into the material. A 25mm wide joint failed in tensile shear testing at loads exceeding 6000N. This high joint strength was attributed to the formation of a 450nm thick layer of Fe3Al intermetallic compound on the steel surface as a result of the interaction between Al from the AZ31B alloy and Fe. The presence of Zn-coating layer was essential to eliminate the negative effects of oxides on the joining process.
Laser welding of AZ31B magnesium alloy to Zn-coated steel
Highlights ► Magnesium alloy was successfully laser welded to Zn-coated steel. ► The joint strength exceeded 6000N on a 25mm wide specimen. ► A 450nm thick layer of Fe3Al was uniformly formed on the steel surface.
Abstract The characteristics of laser lap welding of AZ31B magnesium alloy to Zn-coated steel were investigated. Welding was difficult when the laser beam was irradiated onto the AZ31B alloy and the processing parameters were set to obtain a keyhole welding mode. The difference in the physical properties between the two materials resulted in unstable welding process particularly when the laser beam penetrated into the steel specimen and a keyhole was formed therein. By switching to a conduction mode, the process stability was improved and successful welding could be achieved because the liquid metal film remained unbroken and the laser beam did not penetrate into the material. A 25mm wide joint failed in tensile shear testing at loads exceeding 6000N. This high joint strength was attributed to the formation of a 450nm thick layer of Fe3Al intermetallic compound on the steel surface as a result of the interaction between Al from the AZ31B alloy and Fe. The presence of Zn-coating layer was essential to eliminate the negative effects of oxides on the joining process.
Laser welding of AZ31B magnesium alloy to Zn-coated steel
Wahba, M. (author) / Katayama, S. (author)
2011-10-18
6 pages
Article (Journal)
Electronic Resource
English
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