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Arc characteristics and welding state in gas-focusing TIG

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Abstract

Gas-focusing TIG (GF-TIG) is developed by adding a focusing gas flow around the tungsten tip. Experimental results show that GF-TIG has advantages over conventional TIG: A larger focusing gas flow rate will enhance the arc shrinkage state and thermal pinch effect. The high-temperature cathode region size decreases, and the tungsten tip erosion degree is reduced. The arc root has a smaller diameter. The arc pressure and temperature increase with the focusing gas flow. When the focusing gas flow rate reaches 10 L/min, GF-TIG can fully penetrate the workpiece in keyhole mode, while TIG can only penetrate about half depth at the same welding current of 250A. GF-TIG is proven to highly increase penetration ability and improve welding efficiency.

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Funding

The authors are grateful for the financial support for this research from the National Natural Science Foundation of China (51975403, 52375373).

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Authors and Affiliations

  1. School of Materials Science and Engineering & Tianjin Key Laboratory of Advanced Joining Technology, Tianjin University, Tianjin, 300072, China

    Fei Liu & ZuMing Liu

  2. China Construction Eighth Engineering Bureau Co., Ltd., Shanghai, 200122, China

    WenBin Zhang

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  1. Fei Liu
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  2. ZuMing Liu
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  3. WenBin Zhang
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Contributions

Fei Liu performed the research, analyzed data, and wrote the paper; ZuMing Liu designed the study and revised the manuscript; WenBin Zhang performed the data processing.

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Correspondence to ZuMing Liu.

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Liu, F., Liu, Z. & Zhang, W. Arc characteristics and welding state in gas-focusing TIG. Int J Adv Manuf Technol 129, 5335–5346 (2023). https://doi.org/10.1007/s00170-023-12631-3

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