Analysis on Characteristic of Ultra High Frequency Pulsed Gas Tungsten Arc Welding Process

doi:10.3901/JME.2016.02.026

Abstract

Abstract: Bead-on-plate welding test are carried on 5 mm thickness Ti-6Al-4V titanium alloy plates by the processes both of conventional gas tungsten arc welding (C-GTAW) and the ultra high frequency pulsed GTAW (UHFP-GTAW) in the same average welding current (60 A). The temperature of molten pool center is monitored in real time with thermal infrared imager Fluke Ti400. These measurements before the arc moving and moving at a speed of 50 mm/min are analyzed respectively. The results show that compared with the C-GTAW in same condition, the maximum of the temperature of weld pool center are 10-40 K enhanced by UHFP-GTAW for higher density power with different pulse frequencies. The microstructure and mechanical properties tests are conducted on 1.5 mm thickness Ti-6Al-4V butt joints, verified that the UHFP-GTAW had influences in improving tensile and fatigue properties because of a larger density of basketweave formed by the short and uniform acicular α' martensite in fusion zone and a more compact arrangement of α' in heat affected zone. The elongation and percentage reduction of area respectively are increased by 30% and 50% at least, and the fatigue life triples at least.

Key words: infrared temperature measurement, microstructure and properties, Ti-6Al-4V titanium alloy, ultra high frequency pulsed GTAW

CLC Number:

TG402
TG457

QI Bojin, YANG Zhou, YANG Mingxuan, CONG Baoqiang. Analysis on Characteristic of Ultra High Frequency Pulsed Gas Tungsten Arc Welding Process[J]. Journal of Mechanical Engineering, 2016, 52(2): 26-32.

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Analysis on Characteristic of Ultra High Frequency Pulsed Gas Tungsten Arc Welding Process

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