scholarly journals The Effects of Start Block and Arc Length on Melt Through and Unmelted Zone at Welding Start in High Speed Plasma Arc Welding of Thin Plate

2008 ◽  
Vol 26 (2) ◽  
pp. 92-97
Author(s):  
Yong-Su Chu ◽  
Seong-Joon Hong ◽  
Jae-Pil Jung ◽  
Sang-Myung Cho
Keyword(s):  
Thin Plate ◽  
Arc Welding ◽  
High Speed ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Length

Micro Plasma Arc Welding of AM 350 Precipitation Hardening Alloys

2011 ◽  
Vol 121-126 ◽  
pp. 2681-2685 ◽  
Author(s):  
Kuang Hung Tseng ◽  
Yung Chang Chen ◽  
Yung Chuan Chen
Keyword(s):  
Arc Welding ◽  
Precipitation Hardening ◽  
Argon Atmosphere ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Length ◽  
Weld Shape ◽  
Arc Voltage ◽  
Low Sensitivity ◽  
Micro Plasma Arc Welding

Micro plasma arc welding (micro PAW) was carried out AM 350 precipitation hardening alloy to produce an edge-joint weld. The application of micro PAW technique was also demonstrated in the present work. The results indicated that the arc voltage increased with increasing quantity of added hydrogen in the argon atmosphere. The collimated shape of low current plasma arc was mainly responsible for the low sensitivity of weld shape to variations in arc length. The edge welded bellows of AM 350 alloys have been successfully welded using the present micro PAW technique.

Studies on the Parametric Effects of Plasma Arc Welding of 2205 Duplex Stainless Steel

2018 ◽  
Vol 37 (3) ◽  
pp. 219-232 ◽  
Author(s):  
R. Selva Bharathi ◽  
N. Siva Shanmugam ◽  
R. Murali Kannan ◽  
S. Arungalai Vendan
Keyword(s):  
Stainless Steel ◽  
Duplex Stainless Steel ◽  
Welding Speed ◽  
Arc Welding ◽  
Welding Current ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Arc Length ◽  
Depth Of Penetration ◽  
Bead Width

AbstractThis research study attempts to create an optimized parametric window by employing Taguchi algorithm for Plasma Arc Welding (PAW) of 2 mm thick 2205 duplex stainless steel. The parameters considered for experimentation and optimization are the welding current, welding speed and pilot arc length respectively. The experimentation involves the parameters variation and subsequently recording the depth of penetration and bead width. Welding current of 60–70 A, welding speed of 250–300 mm/min and pilot arc length of 1–2 mm are the range between which the parameters are varied. Design of experiments is used for the experimental trials. Back propagation neural network, Genetic algorithm and Taguchi techniques are used for predicting the bead width, depth of penetration and validated with experimentally achieved results which were in good agreement. Additionally, micro-structural characterizations are carried out to examine the weld quality. The extrapolation of these optimized parametric values yield enhanced weld strength with cost and time reduction.

scholarly journals Real-Time Temperature Measurement Using Infrared Thermography Camera and Effects on Tensile Strength and Microhardness of Hot Wire Plasma Arc Welding

Metals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 1046
Author(s):  
Nirut Naksuk ◽  
Jiradech Nakngoenthong ◽  
Waravut Printrakoon ◽  
Rattanapon Yuttawiriya
Keyword(s):  
Tensile Strength ◽  
Cooling Rate ◽  
Infrared Thermography ◽  
Feed Rate ◽  
Arc Welding ◽  
High Speed ◽  
Plasma Arc Welding ◽  
Plasma Arc ◽  
Hot Wire ◽  
Wire Feed

The hot wire plasma arc welding process, a hybrid process between the plasma arc welding (PAW) process and hot wire process, is used to weld 316 stainless steel sheets, in which the temperature generated during welding is recorded in real time with a high-speed infrared thermography camera. Therefore, this research studies the factors in the hot wire process, of which there are two: (1) wire feed rate and (2) wire current; this study investigated the tensile strength, microhardness, and relationship of cooling rate per tensile strength and microhardness. The study found that the hot wire current plays an important role in cooling rates and tensile strength. The temperature results from high-speed infrared thermography camera show that the maximum welding temperature is around 1300 °C. The weld pool has a temperature between 900 and 1300 °C and the temperature profile of the weld pool will look like an “M” shaped, which is caused by the hot wire process. Finally, the appropriate hot wire parameters are 1.5 m/min for wire feed rate and 40A for wire current, which will give the workpiece cooling rate of 800–500 °C as 13.42 °C/s, tensile strength of 610.95 MPa, and the average Vickers microhardness of 195 HV.

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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