Heating Characteristics of Gas Tungsten Arc Welding of Copper Thick Plates with Shielding Gas of Argon, Helium or Nitrogen

2007 ◽  
pp. 2096-2099
Author(s):  
Jiu Chun Yan ◽  
Yi Nan Li ◽  
Wei Wei Zhao ◽  
Shi Qin Yang
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Shielding Gas ◽  
Thick Plates ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Heating Characteristics of Gas Tungsten Arc Welding of Copper Thick Plates with Shielding Gas of Argon, Helium or Nitrogen

2007 ◽  
Vol 353-358 ◽  
pp. 2096-2099 ◽  
Author(s):  
Jiu Chun Yan ◽  
Yi Nan Li ◽  
Wei Wei Zhao ◽  
Shi Qin Yang
Keyword(s):  
Welded Joints ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Rise Velocity ◽  
Shielding Gas ◽  
Welding Temperature ◽  
Thick Plates ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Weld Pools

The welding temperature patterns of gas tungsten arc welding for copper thick plates during Ar, He or N2 shielded arc welding were simulated, and the size of weld pools and heat-affected zones have been compared. It was predicted that the heat-affected zone in the welded joints during Ar arc welding is the widest and that during N2 arc welding is the narrowest, while the size of weld pools using Ar (preheating at 400°C), He and N2 (without preheating) shielding arc welding is very similar. Among the three kinds of gases shielded arc welding, the temperature gradient of welded joints during Ar arc welding is the least and that during N2 arc welding is the greatest. The temperature rise velocity at the arc center during N2 arc welding is the highest, and those at the zone close to the weld pool of welded joints during He arc and N2 arc welding are a few higher than that during Ar arc welding.

Influence of plasma characteristics on nitrogen mixing into shielding gas in helium gas tungsten arc welding

2014 ◽  
Vol 29 (5) ◽  
pp. 325-333
Author(s):  
Shinji Kodama ◽  
Kazuki Sugiura ◽  
Shota Nakanishi ◽  
Daisuke Sakai ◽  
Yoshihiro Tsujimura ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Shielding Gas ◽  
Gas Tungsten Arc ◽  
Helium Gas ◽  
Plasma Characteristics ◽  
Gas Tungsten

scholarly journals Influence of Plasma Characteristics on Nitrogen Mixing into Shielding Gas in Helium Gas Tungsten Arc Welding

2013 ◽  
Vol 31 (1) ◽  
pp. 80-87 ◽  
Author(s):  
Shinji KODAMA ◽  
Kazuki SUGIURA ◽  
Shota NAKANISHI ◽  
Daisuke SAKAI ◽  
Yoshihiro TSUJIMURA ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Shielding Gas ◽  
Gas Tungsten Arc ◽  
Helium Gas ◽  
Plasma Characteristics ◽  
Gas Tungsten

scholarly journals Arc Characteristics and Weld Bead Microstructure of Ti-6Al-4V Titanium Alloy in Ultra-high Frequency Pulse Gas Tungsten Arc Welding (UHFP-GTAW) Process

2020 ◽  
Vol 26 (4) ◽  
pp. 426-431
Author(s):  
Wei LI ◽  
Gaochong LV ◽  
Qiang WANG ◽  
Songtao HUANG
Keyword(s):  
Titanium Alloy ◽  
Fusion Zone ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Weld Bead ◽  
Gas Tungsten Arc ◽  
Arc Characteristics ◽  
Arc Pressure ◽  
Gtaw Process ◽  
Gas Tungsten

To resolve the problem of grain coarsening occurring in the fusion zone and the heat-affected zone during conventional gas tungsten arc welding(C-GTAW) welded titanium alloy, which severely restricts the improvement of weld mechanical properties, welding experiments on Ti-6Al-4V titanium alloy by adopting ultra-high frequency pulse gas tungsten arc welding (UHFP-GTAW) technique were carried out to study arc characteristics and weld bead microstructure. Combined with image processing technique, arc shapes during welding process were observed by high-speed camera. Meanwhile the average arc pressure under various welding parameters were obtained by adopting pressure measuring equipment with high-precision. In addition, the metallographic samples of the weld cross section were prepared for observing weld bead geometry and microstructure of the fusion zone. The experimental results show that, compared with C-GTAW, UHFP-GTAW process provides larger arc energy density and higher proportion of arc core region to the whole arc area. Moreover, UHFP-GTAW process has the obviously effect on grain refinement, which can decrease the grain size of the fusion zone. The results also revealed that a significant increase of arc pressure while increasing pulse frequency of UHFP-GTAW, which could improve the depth-to-width ratio of weld beads.

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