Effect of pulse frequency on microstructure and properties of Ti-6Al-4V by ultrahigh-frequency pulse gas tungsten arc welding

2013 ◽  
Vol 68 (1-4) ◽  
pp. 19-31 ◽  
Author(s):  
Mingxuan Yang ◽  
Bojin Qi ◽  
Baoqiang Cong ◽  
Fangjun Liu ◽  
Zhou Yang
Keyword(s):  
Arc Welding ◽  
Pulse Frequency ◽  
Gas Tungsten Arc Welding ◽  
Ultrahigh Frequency ◽  
Microstructure And Properties ◽  
Gas Tungsten Arc ◽  
Gas Tungsten ◽  
Frequency Pulse

Effect of pulse frequency in gas tungsten arc welding of powder metallurgical preforms

2004 ◽  
Vol 9 (4) ◽  
pp. 362-368 ◽  
Author(s):  
M.V. Suresh ◽  
B. Vamsi Krishna ◽  
P. Venugopal ◽  
K. Prasad Rao
Keyword(s):  
Arc Welding ◽  
Pulse Frequency ◽  
Gas Tungsten Arc Welding ◽  
Gas Tungsten Arc ◽  
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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