Thermal and metal transfer behaviours in pulsed current gas metal arc weld deposition of Al–Mg alloy

2006 ◽  
Vol 11 (2) ◽  
pp. 232-242 ◽  
Author(s):  
P. K. Ghosh ◽  
V. K. Goyal ◽  
H. K. Dhiman ◽  
M. Kumar
Keyword(s):  
Metal Transfer ◽  
Mg Alloy ◽  
Pulsed Current

Effect of shielding gas on the metal transfer and weld morphology in pulsed current MAG welding of carbon steel

2018 ◽  
Vol 262 ◽  
pp. 382-391 ◽  
Author(s):  
Yong Zhao ◽  
Xiaojian Shi ◽  
Keng Yan ◽  
Guoqiang Wang ◽  
Zhanjun Jia ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Metal Transfer ◽  
Mag Welding ◽  
Pulsed Current ◽  
Shielding Gas

scholarly journals Effects of active gases on droplet transfer and weld morphology in pulsed-current NG-GMAW of mild steel

2020 ◽  
Author(s):  
Guoqiang Liu ◽  
Xinhua Tang ◽  
Qi Xu ◽  
Fenggui Lu ◽  
Haichao Cui
Keyword(s):  
Mild Steel ◽  
High Speed ◽  
Gas Metal Arc Welding ◽  
Welding Process ◽  
Metal Transfer ◽  
Pulsed Current ◽  
Shielding Gas ◽  
Droplet Transfer ◽  
Spray Transfer ◽  
Pure Argon

Abstract Small amount of active gases CO 2 and O 2 were added into pure argon inert shielding gas to improve the weld formation of pulsed-current narrow-gap gas metal arc welding (NG-GMAW) of mild steel. Their effects on droplet transfer and arc behavior were investigated. A high-speed visual sensing system was utilized to observe the metal transfer process and arc morphology. When the proportion of CO 2 , being added into the pure argon shielding gas, changes from 5% to 5%, the metal transfer mode changes from pulsed spray streaming transfer to pulsed projected spray transfer, while it remains the pulsed spray streaming transfer when 2% to 10% O 2 is added. Both CO 2 and O 2 are favorable to stabilizing arc and welding process. O 2 is even more effective than CO 2 . However, O 2 is more likely to cause the inclusion defects in the weld, while CO 2 can improve the weld appearance in some sense. The weld surface concavity, which is sensitive to the formation of lack-of-fusion defect in NG-GMAW, is greatly influenced by the addition of active gas, but the weld width and weld penetration almost keep constant.

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