Influence of cusp magnetic field polarity on arc shape and weld characteristics of twin-electrode TIG welding

LIU Runtao; ZHU Yanli; WANG Zeli; LIU Liming

doi:10.12073/j.hjxb.20220410001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2023 > 44(3): 37-43. > DOI: 10.12073/j.hjxb.20220410001

LIU Runtao, ZHU Yanli, WANG Zeli, LIU Liming. Influence of cusp magnetic field polarity on arc shape and weld characteristics of twin-electrode TIG welding[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(3): 37-43. DOI: 10.12073/j.hjxb.20220410001

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Influence of cusp magnetic field polarity on arc shape and weld characteristics of twin-electrode TIG welding

Key Laboratory of Advanced Connectivity Technology of Liaoning Province, Dalian University of Technology, Dalian 116024, China

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Received Date: April 09, 2022
Available Online: January 17, 2023

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Abstract

Aiming at the problems of low arc pressure and shallow weld penetration in twin-electrode TIG (T-TIG) welding, a T-TIG welding method assisted by cusp magnetic fields with different polarities is introduced. A high-speed camera and an infrared camera were used to study the influence of cusp magnetic fields of different polarities on arc shape and weld characteristics, and a physical model was constructed to reveal the interaction mechanism between cusp magnetic fields and arc plasma. The results show that the external cusp magnetic field affects the shape of the T-TIG arc and the temperature field of the weld, and the cusp magnetic fields of both polarities can refine the structure of the heat-affected zone. Among them, under the action of a positive cusp magnetic field, the T-TIG arc shape changes more greatly, the weld temperature field is more concentrated, the penetration depth of the weld is increased by 37.1% compared with that without a magnetic field, and the energy utilization efficiency increases by 31.6%.
- T-TIG welding,
- cusp magnetic field,
- different polarities,
- arc shape,
- weld characteristics

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