Molten pool behaviors and weld forming characteristics of all-position tandem narrow gap GMAW

2016 ◽  
Vol 87 (5-8) ◽  
pp. 2437-2444 ◽  
Author(s):  
X. Y. Cai ◽  
C. L. Fan ◽  
S. B. Lin ◽  
C. L. Yang ◽  
J. Y. Bai
Keyword(s):  
Molten Pool ◽  
Narrow Gap ◽  
Weld Forming ◽  
Forming Characteristics

Molten pool behaviour and weld forming mechanism of tandem narrow gap vertical GMAW

2016 ◽  
Vol 21 (2) ◽  
pp. 124-130 ◽  
Author(s):  
X. Y. Cai ◽  
S. B. Lin ◽  
C. L. Fan ◽  
C. L. Yang ◽  
W. Zhang ◽  
...  
Keyword(s):  
Molten Pool ◽  
Narrow Gap ◽  
Forming Mechanism ◽  
Weld Forming

Effect of swing arc on molten pool behaviors in narrow-gap GMAW of 5083 Al-alloy

2018 ◽  
Vol 259 ◽  
pp. 243-258 ◽  
Author(s):  
Chenxiao Zhu ◽  
Jason Cheon ◽  
Xinhua Tang ◽  
Suck-Joo Na ◽  
Fenggui Lu ◽  
...  
Keyword(s):  
Molten Pool ◽  
Al Alloy ◽  
Narrow Gap ◽  
5083 Al Alloy

scholarly journals Numerical Analysis of the Heating Characteristics of Magnetic Oscillation Arc and the Fluid Flow in Molten Pool in Narrow Gap Gas Tungsten Arc Welding

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5799
Author(s):  
Xiaoxia Jian ◽  
Xing Yang ◽  
Jingqian Li ◽  
Weihua Wang ◽  
Hebao Wu
Keyword(s):  
Heat Flux ◽  
Arc Welding ◽  
Molten Pool ◽  
Gas Tungsten Arc Welding ◽  
Magnetic Flux Density ◽  
Narrow Gap ◽  
Maximum Heat ◽  
Gas Tungsten Arc ◽  
Magnetic Oscillation ◽  
Gas Tungsten

Magnetic oscillation arc (MOA) technology was developed to avoid insufficient fusion defects appearing at the sidewalls in narrow gap gas tungsten arc welding (NG-GTAW). In this work, a unified model was developed to simulate the process of MOA assisted NG-GTAW. The model included the MOA, welding pool, workpiece and the coupling interaction between them. The heating characteristic of the MOA and the flow of liquid metal were simulated, and the mechanism of forming a uniform welding bead under MOA was investigated. It was found that if the magnetic flux density increased to 9 mT, the MOA could point to the sidewall directly; the maximum heat flux at the bottom declined by almost half and at the side, it increased by more than ten times. Additionally, the heat flux was no longer concentrated but dispersed along the narrow groove face. Under the effect of MOA, there were mainly two flow vortexes in the molten pool, which could further increase the heat distribution between the bottom, sidewall and corner, and was beneficial for the formation of a good-shape weld. The model was validated by experimental data.

scholarly journals Influence of the Longitudinal Magnetic Field on the Formation of the Bead in Narrow Gap Gas Tungsten Arc Welding

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1351 ◽  
Author(s):  
Xiaoxia Jian ◽  
Hebao Wu
Keyword(s):  
Magnetic Field ◽  
Arc Welding ◽  
Molten Pool ◽  
Longitudinal Magnetic Field ◽  
Side Wall ◽  
Experimental Results ◽  
Narrow Gap ◽  
Welding Arc ◽  
Maximum Value ◽  
Side Walls

The oscillation arc assisted by an extra alternating longitudinal magnetic field (LMF) in narrow gap tungsten arc welding is proved to be effective in avoiding welding defects due to insufficient fusion at the side walls in joining thick wall plates. The behavior of the welding arc and molten pool under the LMF is simulated to reveal the influence of the LMF on the formation of a uniform penetration weld bead. A unified mathematical model was developed for the narrow gap tungsten arc welding including the plasma arc, molten pool, electrode, and their interactions. Under the LMF, the whole welding arc is deflected and oscillates between the two side walls. When the magnetic-field strength is larger than 6 mT, the axis of the arc deflects to the side wall; the maximum value of heat flux at the bottom decreases by one-half, and the maximum value at the side wall is increased by a factor of ten. On the other hand, under the LMF, the forces acting on the molten pool are changed; the fluid flow pattern is helpful to increase the heat transferred to the side walls. The model is validated by experimental results. Both the percentage deviations of the simulation weld penetration at the side wall and at the bottom from the experimental results are lower than 10%.

Molten pool behaviors and their influences on welding defects in narrow gap GMAW of 5083 Al-alloy

2018 ◽  
Vol 126 ◽  
pp. 1206-1221 ◽  
Author(s):  
Chenxiao Zhu ◽  
Jason Cheon ◽  
Xinhua Tang ◽  
Suck-Joo Na ◽  
Haichao Cui
Keyword(s):  
Molten Pool ◽  
Al Alloy ◽  
Narrow Gap ◽  
Welding Defects ◽  
5083 Al Alloy

Properties of Creeping Discharge in Narrow Gap between Dielectric Plates in PFAE Oil

2011 ◽  
Vol 131 (10) ◽  
pp. 817-823
Author(s):  
Takuro Usui ◽  
Ryoichi Hanaoka ◽  
Shinzo Takata ◽  
Yasunori Kanamaru ◽  
Hidenobu Koide ◽  
...  
Keyword(s):  
Narrow Gap ◽  
Creeping Discharge
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