Single vision system for simultaneous observation of keyhole and weld pool in plasma arc welding

2015 ◽  
Vol 215 ◽  
pp. 71-78 ◽  
Author(s):  
Guokai Zhang ◽  
Chuan Song Wu ◽  
Xinfeng Liu
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Vision System ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Simultaneous Observation ◽  
Single Vision

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.

scholarly journals Relationship among Welding Defects with Convection and Material Flow Dynamic Considering Principal Forces in Plasma Arc Welding

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1444
Author(s):  
Huu Loc Nguyen ◽  
Anh Van Nguyen ◽  
Han Le Duy ◽  
Thanh-Hai Nguyen ◽  
Shinichi Tashiro ◽  
...  
Keyword(s):  
Weld Pool ◽  
Material Flow ◽  
Arc Welding ◽  
Welding Current ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Flow Dynamic ◽  
Pool Surface ◽  
Welding Defects ◽  
Marangoni Force

The material flow dynamic and velocity distribution on the melted domain surface play a crucial role on the joint quality and formation of welding defects. In this study, authors investigated the effects of the low and high currents of plasma arc welding on the material flow and thermodynamics of molten pool and its relationship to the welding defects. The high-speed video camera (HSVC) was used to observe the convection of the melted domain and welded-joint appearance. Furthermore, to consider the Marangoni force activation, the temperature on the melted domain was measured by a thermal HSVC. The results revealed that the velocity distribution on the weld pool surface was higher than that inside the molten weld pool. Moreover, in the case of 80 A welding current, the convection speed of molten was faster than that in other cases (120 A and 160 A). The serious undercut and humping could be seen on the top surface (upper side) and unstable weld bead was visualized on the back side (bottom surface). In the case of 160 A welding current, the convection on the weld pool surface was much more complex in comparison with 80 A and 120 A cases. The excessive convex defect at the bottom side and the concave defect at the top surface were observed. In the case of 120 A welding current, two convection patterns with the main flow in the backward direction were seen. Almost no welding defect could be found. The interaction between the shear force and Marangoni force played a solid state on the convection and heat transportation processes in the plasma arc welding process.

A 3-D lattice Boltzmann analysis of weld pool dynamic behaviors in plasma arc welding

2018 ◽  
Vol 139 ◽  
pp. 623-635 ◽  
Author(s):  
Yanhui Feng ◽  
Junjie Zhou ◽  
Junjie Cai ◽  
Xinxin Zhang ◽  
Chuansong Wu
Keyword(s):  
Weld Pool ◽  
Lattice Boltzmann ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Dynamic Behaviors

Elucidation of the weld pool convection and keyhole formation mechanism in the keyhole plasma arc welding

2019 ◽  
Vol 131 ◽  
pp. 920-931 ◽  
Author(s):  
Dongsheng Wu ◽  
Anh Van Nguyen ◽  
Shinichi Tashiro ◽  
Xueming Hua ◽  
Manabu Tanaka
Keyword(s):  
Weld Pool ◽  
Formation Mechanism ◽  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc

Metal flow of weld pool and keyhole evolution in gas focusing plasma arc welding

2020 ◽  
Vol 150 ◽  
pp. 119296 ◽  
Author(s):  
Tian Qing Li ◽  
Lu Chen ◽  
Yu Zhang ◽  
Xi Mou Yang ◽  
Yu Cheng Lei
Keyword(s):  
Weld Pool ◽  
Arc Welding ◽  
Metal Flow ◽  
Plasma Arc Welding ◽  
Plasma Arc
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