In situ monitoring and penetration prediction of plasma arc welding based on welder intelligence-enhanced deep random forest fusion

2021 ◽  
Vol 66 ◽  
pp. 153-165
Author(s):  
Di Wu ◽  
Minghua Hu ◽  
Yiming Huang ◽  
Peilei Zhang ◽  
Zhishui Yu
Keyword(s):  
Random Forest ◽  
Arc Welding ◽  
In Situ Monitoring ◽  
Plasma Arc Welding ◽  
Plasma Arc

In-situ weld-alloying plasma arc welding of SiCp/Al MMC

2007 ◽  
Vol 17 (2) ◽  
pp. 313-317 ◽  
Author(s):  
Yu-cheng LEI ◽  
Wei-jin YUAN ◽  
Xi-zhang CHEN ◽  
Fei ZHU ◽  
Xiao-nong CHENG
Keyword(s):  
Arc Welding ◽  
Plasma Arc Welding ◽  
Plasma Arc

Workpiece Cleaning During Variable Polarity Plasma Arc Welding of Aluminum

1994 ◽  
Vol 116 (4) ◽  
pp. 463-466 ◽  
Author(s):  
Q. Pang ◽  
T. Pang ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Arc Welding ◽  
Dielectric Breakdown ◽  
Surface Preparation ◽  
Refractory Oxide ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Reverse Polarity ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc

Variable Polarity Plasma Arc welding has proved to be extremely successful in welding aluminum alloys despite their adherent refractory oxide. This success has been attributed to removal of the oxide during the reverse polarity cycle. In situ optical spectroscopy is used to measure the amount of hydrogen and oxygen in the plasma arc with a minimum detectable limit of less than 100 ppm. It was found that the amount of contamination is independent of surface preparation and torch speed. Using this information, it is proposed that the predominant mechanism for reverse polarity cleaning in aluminum is dielectric breakdown of the surface oxide ahead of the torch rather than by ion sputtering.

The Effect of Weld Gas Flow Rate on Al-Li Weldability

1993 ◽  
Vol 115 (3) ◽  
pp. 263-267
Author(s):  
L. F. Martinez ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Flow Rate ◽  
Arc Welding ◽  
Gas Flow ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Gas Flow Rate ◽  
Welding Arc ◽  
Variable Polarity ◽  
Variable Polarity Plasma Arc

Adequate shield and plasma gas flow rate during plasma arc welding are crucial factors in achieving high quality welds. Too low a shield gas flow rate lets atmosphere enter into the arc and too high a rate wastes weld gas and may cause turbulence and entrain atmosphere. Sufficient plasma gas flow is required for keyhole welding and, as shown in this paper, can reduce hydrogen contamination in the weld. In-situ optical spectroscopy used to detect oxygen and hydrogen in the welding arc during variable polarity plasma arc (VPPA) welding of aluminum 2090 revealed that there is an easily detected critical shield gas flow rate needed to exclude atmosphere and that this critical rate can be used to automatically control gas flow rates during welding.

Spectroscopic Measurements of Hydrogen and Oxygen in Shielding Gas During Plasma Arc Welding

1993 ◽  
Vol 115 (1) ◽  
pp. 145-148 ◽  
Author(s):  
Q. Pang ◽  
T. Pang ◽  
J. C. McClure ◽  
A. C. Nunes
Keyword(s):  
Flow Rate ◽  
Arc Welding ◽  
Gas Flow ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Shielding Gas ◽  
Gas Flow Rate ◽  
Average Temperature ◽  
Welding Arc

In Situ optical spectroscopy has been used on plasma arc welded 2219 aluminum to measure both the average temperature of and the amount of hydrogen and oxygen in the welding arc. Hydrogen and oxygen levels of less than 75 ppm can be readily detected. It is shown that below a critical shield gas flow rate, the rapid invasion of atmosphere can be readily detected by this technique, and that this critical flow rate is dependent on the temperature of the arc.

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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