Microscopic structure and property of double-electrode gas metal arc welding of AZ31B magnesium alloy

2017 ◽  
Vol 22 (3) ◽  
pp. 286-290 ◽  
Author(s):  
Guohong Ma ◽  
Xu Shen ◽  
Qiwen Ping ◽  
Jun Nie ◽  
Jia Ye
Keyword(s):  
Magnesium Alloy ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Microscopic Structure ◽  
Az31b Magnesium Alloy ◽  
Structure And Property ◽  
Metal Arc Welding ◽  
Double Electrode

Effect of DE-GMAW (Double Electroda Gas Metal Arc Welding)’s Resistance on Mechanical and Physical Properties of Aluminium Alloy Weld

2018 ◽  
Vol 789 ◽  
pp. 64-68
Author(s):  
Yustiasih Purwaningrum ◽  
Medilla Kusriyanto ◽  
Rudi Kurniawan ◽  
Okto Akbar Rizky
Keyword(s):  
Physical Properties ◽  
Aluminium Alloy ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Weld Metals ◽  
Metal Arc Welding ◽  
Mechanical And Physical Properties ◽  
Double Electrode ◽  
Gmaw Welding

This paper presented the effect of DE-GMAW (Double electrode gas metal arc welding)resistance on mechanical and physical properties of aluminium alloywelded. DE-GMAWis amethodof welding process that use two electrode. A non consumable torch is added to bypass the current inorder to reduce the heat input. The variation resistance used were 15Ω, 30Ω and 45Ω. Universaltesting machine and Vickers microhardness were used to measured mechanical properties of weldmetals with respect to strength and hardness. The microstructure was investigated by microscopeoptic with 100 x magnification. The grain size of weld metals with resistance value 30Ω is finer than15Ω and 45Ω. Dye penetrant test shows DE-GMAW welding machine that made have goodperformance because it can produce welding joint without surface crack. The results show thatresistance values optimum to DE-GMAW welding on aluminium alloy 5051 with 4 mm thickness is30Ω. It can be seen from the tensile test that shows the highest tensile strength is found in the DEGMAWwelding with resistance values 30Ω.

Metal Transfer in Double-Electrode Gas Metal Arc Welding

2007 ◽  
Vol 129 (6) ◽  
pp. 991-999 ◽  
Author(s):  
Kehai Li ◽  
YuMing Zhang
Keyword(s):  
Base Metal ◽  
Arc Welding ◽  
High Speed ◽  
Gas Metal Arc Welding ◽  
High Melting ◽  
High Productivity ◽  
Spray Transfer ◽  
Metal Arc Welding ◽  
Double Electrode ◽  
Melting Current

Gas metal arc welding (GMAW) is the most widely used process for metal joining because of its high productivity and good quality, but analysis shows that the fundamental characteristic restricts conventional GMAW from further increasing the welding productivity. A novel GMAW process, refereed to as double-electrode GMAW or DE-GMAW, thus has been developed to make it possible to increase the melting current while the base metal current can still be controlled at a desired level. This fundamental change provides an effective method to allow manufacturers to use high melting currents to achieve high melting speed and low base metal heat input. A series of experiments have been conducted to uncover the basic characteristics of this novel process. Results obtained from analyses of high-speed image sequences and recorded current signals suggest that DE-GMAW can lower the critical current for achieving the desired spray transfer, shift the droplet trajectory, reduce the diameter of the droplet, and increase the speed and (generation) rate of the droplets.

Dynamic Model of Consumable Double-Electrode Submerged Arc Welding Process

2015 ◽  
Vol 137 (2) ◽  
Author(s):  
Yi Lu ◽  
Jinsong Chen ◽  
YuMing Zhang
Keyword(s):  
Dynamic Model ◽  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Submerged Arc Welding ◽  
Metal Arc Welding ◽  
New Variant ◽  
Double Electrode ◽  
Arc Welding Process ◽  
Submerged Arc

Double-electrode submerged arc welding (DE-SAW) is a new variant of the innovative double-electrode gas metal arc welding (DE-GMAW) process. In order to control this process, its dynamic model needs to be established. To this end, this paper analyzes the melting physical process of the consumable DE-SAW to derive its dynamic model. To identify the parameters in the dynamic model, a series of experiments are designed and performed. Least-squares technique has been used to identify the parameters from the experimental data.

Analysis and Improvement of Metal Transfer Behaviors in Consumable Double-Electrode GMAW Process

2015 ◽  
Vol 137 (1) ◽  
Author(s):  
Ming Zhu ◽  
Yu Shi ◽  
Ding Fan
Keyword(s):  
Arc Welding ◽  
Gas Metal Arc Welding ◽  
Metal Transfer ◽  
Force Balance ◽  
Current Electrode ◽  
Main Metal ◽  
Metal Arc Welding ◽  
Weld Appearance ◽  
Double Electrode ◽  
Welding Consumable

Consumable double-electrode gas metal arc welding (consumable DE-GMAW) is the efficient improvement of DE-GMAW. Due to the variety of coupled arc and metal transfer behaviors, this paper applies static force balance theory to analyze the changes in the forces acting on the main and bypass droplets separately. For main torch, the bypass arc changes the forces affecting on the main droplet, and the main metal transfer becomes more desirable. For bypass torch, with direct current electrode negative (DCEN) polarity, the volume of droplet is big and not easily transfers to the weld pool. In order to improve the bypass metal transfer, a method has been proposed which adds CO2 to pure argon shielding gas to change the forces affecting on the bypass droplet. Then, the welding experiment is carried out to test the effectiveness of this method. It is found that bypass droplet transfers easily and the diameter of bypass droplet is decreased significantly. Also a good weld appearance is acquired.

A Way to Weld Sheet Metal with Double-Electrode GMAW

2013 ◽  
Vol 651 ◽  
pp. 333-337 ◽  
Author(s):  
Guo Hong Ma ◽  
Yu Ming Zhang
Keyword(s):  
Arc Welding ◽  
High Speed ◽  
Gas Metal Arc Welding ◽  
Metal Transfer ◽  
Constant Current ◽  
Spray Transfer ◽  
Metal Arc Welding ◽  
Globular Transfer ◽  
Double Electrode ◽  
Welding System

This paper designed a double-electrode GMAW(gas metal arc welding) system. This system includes main arc and bypass arc. Main arc (Base metal current: Ibm) is supplied with Constant Current power (CC mode) and bypass arc (bypass current: Ibp) is Constant Voltage power (CV mode). Main arc electrode used common carbon wire, bypass arc electrode used water cool copper. Welding experiment shows this DE-GMAW can change common metal transfer into spray transfer with lowest critical total current (Itotal) 200 amps. When Ibm decreases and bypass voltage increases, this critical current will increase and it is less than 230 amps when keeping spray transfer. High speed video proved that metal transfer is changed from spray transfer to globular transfer.

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