Arc ignitability,bead protection and weld shape variations for He–Ar–O2 shielded GTA welding on SUS304 stainless steel |
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| Authors: | Shanping Lu Hidetoshi Fujii Kiyoshi Nogi |
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| Affiliation: | 1. Joining and Welding Research Institute, Osaka University, Osaka 567-0047, Japan;2. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Science, Shenyang 110016, PR China;1. Department of Mechanical Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;2. Science and Technology on Power Beam Lab, Beijing Aeronautical Manufacturing Technology Research Institute, China;1. Shanghai Key Laboratory of Materials Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, China;1. Central Metallurgical Research and Development Institute, Helwan, Cairo 11421, Egypt;2. Joining and Welding Research Institute, Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;1. Key Laboratory for Precision and Non-Traditional Machining Technology of Ministry of Education Dalian University of Technology, Dalian, 116024, China;2. School of Materials Science and Engineering Dalian University of Technology, Dalian, 116024, China |
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| Abstract: | The influences of argon and oxygen in helium base shielded GTA welding on the arc ignitability, bead protection and weld penetration are systematically investigated by bead-on-plate welding on SUS304 stainless steel. Experimental results show that the critical electrode tip work distance for arc ignition is increased from 1 mm under pure He shielding to 5 mm under He–50%Ar shielding. Small addition of oxygen content to the He–Ar mixed shielding can significantly change the weld shape from a wide shallow type to a narrow deep one, and the weld depth/width ratio can be doubled due to the change in the Marangoni convection from an outward to an inward direction. |
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