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

材料导报

2018, Vol. 32

Issue (16): 2816-2821 https://doi.org/10.11896/j.issn.1005-023X.2018.16.021

金属与金属基复合材料

超声冲击处理对铝合金焊接应力的影响

贾翠玲¹, 陈芙蓉²

1 内蒙古工业大学工程训练教学部,呼和浩特 010051;
2 内蒙古工业大学材料科学与工程学院,呼和浩特 010051

Effect of Ultrasonic Impact Treatment on Welding Stress of Aluminum Alloy

JIA Cuiling¹, CHEN Furong²

1 Engineering Training Teaching Department, Inner Mongolia University of Technology, Hohhot 010051;
2 Institution of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot 010051

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摘要为了探究超声冲击处理(UIT)对铝合金材料焊接应力的影响,采用有限元分析软件AQAQUS建立了7A52铝合金双丝熔化极隋性气体保护焊(MIG)焊接模型和超声冲击处理耦合模型,得到了冲击后的应力场,分析了冲击前后残余应力分布特点;通过改变冲击针移动速度、冲击位置以及冲击针直径,分析其对焊接应力的影响规律,旨在探讨超声冲击处理对铝合金焊接应力改善的影响规律。计算结果表明,超声冲击处理能够显著改善焊缝和热影响区的焊接残余应力,且超声冲击处理对焊趾处的冲击比对焊缝处冲击产生的压应力数值大、范围宽;随着冲击移动速度的增加,焊接接头处压应力值逐渐减小,且移动速度增加到一定程度将会出现欠处理状态,达不到产生压应力的效果;冲击针直径对焊后残余应力影响较大,随着冲击针直径的增大,其接头处压应力值会增加,且产生的纵向残余压应力区间会增大;经过超声冲击处理后的试验和数值计算表明,材料模型中是否考虑应变率对应力结果影响很大,应该根据实际材料的应变率硬化程度建立准确的材料模型。

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关键词: 超声冲击处理 7A52铝合金残余应力有限元模拟

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

出版日期: 2018-08-25 发布日期: 2018-09-18

ZTFLH:

TG404

基金资助: 内蒙古自治区自然科学基金资助项目(2017MS0502);内蒙古自治区高等学校科学研究资助项目(NJZY087); 国家自然科学基金(50765003;51165026)

作者简介: 贾翠玲:女,1980年生,博士,高级实验师,主要从事铝合金焊接、表面处理以及数值模拟等研究 E-mail:jialing_jlu2004@163.com

引用本文:

贾翠玲, 陈芙蓉. 超声冲击处理对铝合金焊接应力的影响[J]. 材料导报, 2018, 32(16): 2816-2821.
JIA Cuiling, CHEN Furong. Effect of Ultrasonic Impact Treatment on Welding Stress of Aluminum Alloy. Materials Reports, 2018, 32(16): 2816-2821.

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

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