INFLUENCES OF ULTRASONIC PULSE SQUARE-WAVE CURRENT PARAMETERS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF 2219 ALUMINUM ALLOY WELD JOINTS

Acta Metall Sin

2009, Vol. 45

Issue (9): 1057-1062 DOI:

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INFLUENCES OF ULTRASONIC PULSE SQUARE-WAVE CURRENT PARAMETERS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF 2219 ALUMINUM ALLOY WELD JOINTS

CONG Baoqiang; QI Bojin; ZHOU Xingguo; LUO Jun

School of Mechanical Engineering and Automation; Beihang University; Beijing 100191

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CONG Baoqiang QI Bojin ZHOU Xingguo LUO Jun. INFLUENCES OF ULTRASONIC PULSE SQUARE-WAVE CURRENT PARAMETERS ON MICROSTRUCTURES AND MECHANICAL PROPERTIES OF 2219 ALUMINUM ALLOY WELD JOINTS. Acta Metall Sin, 2009, 45(9): 1057-1062.

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Abstract

In order to overcome some problems in variable polarity gas tungsten arc welding (VP-GTAW) employed for welding aluminum alloy components, poor strength and ductility of weld metal, solidification cracking and weld porosity, a novel ultrafast-convert high frequency pulsed current VP-GTAW technique is developed. The current converting speed in the novel technique is enhanced from less than 10 A/μs to more than 50-100 A/μs and high frequency pulsed current which has a frequency of more than 20 kHz is exactly integrated in the positive polarity current duration. It is expected that the novel pulsed VP-GTAW technique can improve the weld quality of aluminum alloy significantly. Thus, it is imperative to understand the effect of pulsed current parameters on the weld characteristics in the pulsed VP-GTAW process. The measured results of 2219-T87 high strength aluminum alloy weld joints show that the application of ultrasonic pulse current makes the coarse grains in weld zone change to the fine equiaxed grains, and a band-like zone with finer equiaxed non-dentrites appears. The width of weld fusion zone is obviously decreased and the mechanical properties of weld joints are predominantly improved. The improvements of the structure and weld properties can be significantly enhanced with the increases of the ultrasonic pulse current amplitude and pulse frequency, and decrease of the pulse duty cycle in certain ranges. Compared with the conventional VP-GTAW, tensile strength and elongation of weld joints are increased by about 22% and 111%, respectively, under the conditions of pulse current amplitude of 100 A, pulse frequency of 40 kHz and pulse duty cycle of 20%.

Key words: high strength aluminum alloy ultrasonic pulse current variable polarity equiaxed
non-dentrite mechanical property

Received: 26 February 2009

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