Page 135 - 机械工程材料2024年第十一期

吴叶军，等：考虑侧壁热源的摇动电弧窄间隙GMA焊接温度场有限元模拟

Finite Element Simulation of Temperature Field in Swing Arc Narrow Gap GMA
Welding Considering Sidewall Heat Source

WU Yejun , XU Guoxiang , WANG Jiayou , CHEN Baoguo 1
1, 2
2
2
(1. Intelligent Manufacturing College, Changzhou Vocational Institute of Engineering, Changzhou 213164, China; 2. Jiangsu
Provincial Key Laboratory of Advanced Welding Technology, Jiangsu University of Science and Technology,
Zhenjiang 212003, China)

Abstract: Based on the arc deflection of the new type swing arc narrow gap melting electrode gas shield (GMA)
welding, the arc heat source staying at the sidewall was decomposed into arc component heat source and sidewall heat
source, and the heat source model considering the sidewall heat source was established. The finite element model of the
new type swing arc narrow gap GMA welding was established by ANSYS software. The cross-section fusion line profile
and thermal cycle curve of welded joint with and without considering sidewall heat source were simulated and verified
by experiments. The temperature field in the swing arc narrow gap GMA welding with considering sidewall heat source
was studied by the finite element simulation method, and was compared with that without considering sidewall heat
source. The results show that the difference between the depth of the highest point of the fusion line on the left and right
sides of the weld cross section by simulation with considering sidewall heat source and the test result was smaller than
that without considering sidewall heat source. The variation trend of the thermal cycle curves at different test points of
the welded joint by simulation with and without considering sidewall heat source was basically consistent with the test
results, and the maximum relative errors of peak temperatures were 1.8% and 3.4%, respectively. The heat source
model considering the sidewall heat source could more accurately describe the heat source distribution characteristics in
the swing arc narrow gap GMA welding. The bottom weld penetration depth by simulation with considering sidewall
heat source was smaller than that without considering the sidewall heat source, and the side weld penetration depth was
larger, but the size change was less than 0.1 mm. The formation law of the molten pool before the temperature field
stabilization was the same as that without considering the sidewall heat source, but the molten pool size on the upper
surface of the joint was smaller; after the temperature field was stabilized, the molten pool size on the upper surface of
the joint was the same.
Key words: swing arc narrow gap welding; sidewall heat source; temperature field; numerical simulation

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