scholarly journals Residual stress evaluation in API 5L X65 girth welded pipes joined by friction welding and gas tungsten arc welding

2019 ◽  
Vol 8 (1) ◽  
pp. 988-995 ◽  
Author(s):  
Carlos Alexandre Pereira de Moraes ◽  
Mariane Chludzinski ◽  
Rafael Menezes Nunes ◽  
Guilherme Vieira Braga Lemos ◽  
Afonso Reguly
Keyword(s):  
Residual Stress ◽  
Friction Welding ◽  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Stress Evaluation ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

Measurements of Residual Stress and Angular Distortion of 7075 Aluminum Alloy after Gas Tungsten Arc Welding

2013 ◽  
Vol 302 ◽  
pp. 452-456
Author(s):  
Shih Jeh Wu ◽  
Chiao Wei Chung ◽  
Chen Ming Kuo
Keyword(s):  
Residual Stress ◽  
Aluminum Alloy ◽  
Arc Welding ◽  
Imaging System ◽  
Diffraction Method ◽  
Gas Tungsten Arc Welding ◽  
Angular Distortion ◽  
7075 Aluminum Alloy ◽  
Gas Tungsten Arc ◽  
Gas Tungsten

7075 aluminum alloy is one of the most popular materials for structure. There are lots of demands for welding these structural materials. During the fast high temperature heating and cooling process serious residual stress is generated that causes the deterioration of structure strength. In this study, we investigate the residual stress induced in 7075 aluminum alloy after gas tungsten arc welding. X-ray diffraction method is applied to measure the residual stress under different joint angles. The angular distortion is also measured by a 3-D imaging system. Results show that both residual stress and angular distortion increase with the preparation angle.

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.

Modelling and measurements of gas tungsten arc welding in argon–helium mixtures with metal vapour

2021 ◽  
Author(s):  
Junting Xiang ◽  
Keigo Tanaka ◽  
Fiona F. Chen ◽  
Masaya Shigeta ◽  
Manabu Tanaka ◽  
...  
Keyword(s):  
Arc Welding ◽  
Gas Tungsten Arc Welding ◽  
Metal Vapour ◽  
Helium Mixtures ◽  
Gas Tungsten Arc ◽  
Gas Tungsten
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