超声冲击处理对铝合金焊接应力的影响

doi:10.11896/j.issn.1005-023X.2018.16.021

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Abstract In order to explore the influence of stress treated, the finite element model of 7A52 aluminum alloy welded by double wire MIG was established by ultrasonic impact treatment. The coupling model of ultrasonic impact treatment on the welded joint was set up and the residual stress field was obtained after ultrasonic impact treatment. The characteristics of residual stress distribution before and after ultrasonic impact and the influence law of residual stress by changing needle moving speed, treated position and diameter of pin were analyzed. The arm was to explore the influence of residual stress using ultrasonic impact treatment on 7A52 aluminum alloy. The results showed that the ultrasonic impact treatment can improve the surface residual stress of welding seam and heat affected zone significantly. The value and the wide range of compressive stress were larger when treated on weld toe than to weld seam. With the increase of impact moving speed, pressure stress of welding joint decreased. And when moving speed increased to a certain degree which can’t produce the compressive stress. The pin diameter had obvious influence on residual stress of butt welding, and with the increase of pin diameter, compressive stress of welding joint increased, as well as the range of longitudinal residual stress. The results of test and numerical calculation after dealing with the ultrasonic impact revealed that the model of material whether considering strain rate had a great influence on residual stress, and should be based on the actual material strain rate harde-ning degree to establish accurate model.

Key words： ultrasonic impact treatment 7A52 aluminum alloy residual stress finite element simulation

Published: 18 September 2018

CLC number:

TG404

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	JIA Cuiling
	CHEN Furong

Cite this article:

JIA Cuiling,CHEN Furong. Effect of Ultrasonic Impact Treatment on Welding Stress of Aluminum Alloy[J]. Materials Reports, 2018, 32(16): 2816-2821.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.16.021 OR http://www.mater-rep.com/EN/Y2018/V32/I16/2816

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