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https://doi.org/10.15407/as2019.10.02
2019 №10 (01) 2019 №10 (03)

Avtomaticheskaya Svarka (Automatic Welding), #10, 2019, pp. 18-21

Influence of laser power and welding velocity on the microstructure of Zr-based bulk metallic glass welded joints

Haiyan Wanga1, Ma Yanyib2, Zhang Yupenga1, Dong Chunlina1, Yi Yaoyonga1, Xi Huaia1
1Guangdong Provincial Key Laboratory of Advanced Welding Technology, Guangdong Welding Institute (China-Ukraine E.O. Paton Institute of Welding), Guangzhou, 510650, China
2School of Materials Science and Engineering, Shenyang University of Technology, Shenyang, 110870, China

Laser welding is employed to weld Zr67.8Cu24.7Al3.43Ni4.07 bulk metallic glass, and the effects of laser power and welding velocity on the microstructures of bulk metallic glass joints are studied. Owing to the high speed and high-energy density of laser welding, the weld fusion zones remain amorphous structure. Some nano-grains are formed in weld fusion zones and of benefits for the improvement of microhardness. Crystallization happens in heat-affected zone and deteriorates the hardness of materials. The joint welded with laser power of 600 W and velocity of 110 mm/s exhibits the lowest degree of crystallization. Larger laser power or slower welding speed would cause excessive heat accumulation in heat-affected zone. 10 Ref., 1 Tabl., 3 Fig.
Keywords: Bulk metallic glass; laser welding; microstructure; crystallization
Published: 02.10.2019
Received: 01.07.2019

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