scholarly journals Study on plasma arc welding technology and properties of metal materials

2019 ◽  
Vol 563 ◽  
pp. 022003
Author(s):  
Yan Liu ◽  
Jiapeng Liu ◽  
Haiqing Ye ◽  
Yu Yao
Keyword(s):  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Welding Technology ◽  
Metal Materials

Technical Study of Exhaust Valve Overlaying Based on Micro-Plasma Arc Welding

2008 ◽  
Vol 373-374 ◽  
pp. 330-333 ◽  
Author(s):  
Yong Hua Xiang ◽  
Bin Shi Xu ◽  
Yao Hui Lv ◽  
D. Xia
Keyword(s):  
Arc Welding ◽  
Bottom Layer ◽  
Processing Parameters ◽  
Exhaust Valve ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Maximum Hardness ◽  
Welding Technology ◽  
Technical Study ◽  
Micro Plasma Arc Welding

The micro-plasma arc welding technology（MPAW） was used to remanufacture the exhaust valve of W615 engine. The ST6 Co alloy powder was selected as overlaying material, the processing parameters of overlaying was optimized considering the geometry demand of deposited layer, and the current downslope method was adopted to weaken the arc crater. The microstructure characteristics and the micro-hardness of the weld were investigated, no defects were found in the deposited layer or at the interface, and the heat-affected zone among joint was not evident. The maximum hardness situated at the top layer being 657.8HV, with a slight decrease towards the bottom layer and fusion zone.

scholarly journals Numerical Analysis of Keyhole and Weld Pool Behaviors in Ultrasonic-Assisted Plasma Arc Welding Process

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 703
Author(s):  
Junnan Qiao ◽  
Chuansong Wu ◽  
Yongfeng Li
Keyword(s):  
Shear Stress ◽  
Weld Pool ◽  
Arc Welding ◽  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Pressure ◽  
Ultrasonic Assisted

The acoustic radiation force driving the plasma jet and the ultrasound reflection at the plasma arc-weld pool interface are considered to modify the formulas of gas shear stress and plasma arc pressure on the anode surface in ultrasonic-assisted plasma arc welding (U-PAW). A transient model taking into account the dynamic changes of heat flux, gas shear stress, and arc pressure on the keyhole wall is developed. The keyhole and weld pool behaviors are numerically simulated to predict the heat transfer and fluid flow in the weld pool and dynamic keyhole evolution process. The model is experimentally validated. The simulation results show that the acoustic radiation force increases the plasma arc velocity, and then increases both the plasma arc pressure and the gas shear stress on the keyhole wall, so that the keyholing capability is enhanced in U-PAW.

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