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| Research Status and Prospect of Invar Alloy Welding Technology |
| LIU Hongbing, XUAN Yang, YANG Jin |
| ( Materials Engineering College of Shanghai University of Engineering Science, Shanghai 201620, China ) |
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Abstract Invar alloy is widely used in the manufacture of large-scale aircraft composite molds and LNG ships due to its extremely low coefficient of thermal expansion. It has broad application prospects. The key to the wide application of Invar alloy are the quality of the weld and the matching of the thermal expansion coefficient between the weld and the base metal. This article mainly introduces the most widely used traditional welding methods of Invar alloy, MIG and TIG, and the new welding methods including laser welding, laser arc hybrid welding and friction stir welding. Meanwhile, this paper summarizes the welding status of Invar alloy, and proposes a new high-quality, high-efficiency welding method: K–TIG welding.
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2020, 
