随焊干冰激冷冷源尺寸对焊接残余应力影响的有限元分析

发布时间：2018-02-24 10:15

本文关键词： 随焊激冷干冰冷源温度场残余应力　出处：《焊接学报》2017年02期 　论文类型：期刊论文

【摘要】：文中利用米粒状干冰颗粒作为冷却介质进行随焊激冷,通过将干冰颗粒与压缩空气混合,借助喷枪从喷嘴直接喷射于试板上,干冰颗粒与试件接触瞬间升华带走大量热量,实现局部快速冷却.基于热弹塑性有限元方法,对1561铝合金随焊激冷焊接的方法进行了模拟,分析不同长度和宽度的矩形冷源对随焊激冷控制残余应力的影响,从而对干冰喷嘴出口形状设计进行指导,以优化随焊激冷控制焊接应力与变形的效果.结果表明,最佳矩形冷源的长宽为40 mm×25 mm,板中心纵向残余拉应力由162 MPa降低为零,板两端纵向残余压应力由常规焊接的59.3 MPa减小到20.4 MPa,减小大约65.6%.
[Abstract]:In this paper, the rice granular dry ice particles are used as cooling medium to cool with welding. By mixing dry ice particles with compressed air, the dry ice particles are directly sprayed from the nozzle on the test board with the aid of a spray gun, and the dry ice particles sublimate a large amount of heat in the instant of contact with the specimen. Based on the thermoelastic-plastic finite element method, the method of 1561 aluminum alloy cold welding with welding was simulated, and the influence of rectangular cold source of different length and width on the residual stress controlled by welding was analyzed. The results show that the length and width of the optimum rectangular cold source is 40 mm 脳 25 mm, and the longitudinal residual tensile stress of the plate center is reduced from 162 MPa to zero. The longitudinal residual compressive stress at both ends of the plate is reduced from 59.3 MPa to 20.4 MPA, which is about 65.6 MPA.
【作者单位】：浙江工业大学化工机械设计研究所;中船黄埔文冲船舶有限公司;
【基金】：中国博士后科学基金资助项目(2016M590821) 国防基础科研计划资助项目(A0720133002) 黄埔区重大专项资助项目(201518)
【分类号】：TG404

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