摘要
制备SPCC板材电阻点焊胶接接头,并开展拉伸-剪切试验;建立胶接点焊接头的EulerLagrange分析模型,提取胶层界面各个检测点压力时程曲线,分析焊接过程中胶层受热气化过程对熔池产生的冲击;同时,采用超声波水浸聚焦入射法对SPCC板材胶接点焊接头进行超声C扫描成像检测,借助焊点区A扫信号和C扫图像分析接头焊核区的形貌特征。结果表明:胶接接头和点焊接头的抗拉强度均值分别为10 518.325 N和10 164.421 N,胶层的加入提高了点焊接头的强度;胶接点焊过程中胶层气化后的高压气体从上下板之间的空隙排出,并在焊核区周围留下气体排出后的空腔区;基于超声C扫图像特征,将胶接接头分为导电胶层区、胶层气化后的气体排出的空腔区以及熔核区,检测分析结果与仿真分析相吻合。
SPCC sheet resistance spot welding adhesive joint was prepared and tensile shear test was carried out.The Euler-Lagrange analysis model for adhesive spot welding joint is established to extract the pressure time curve of each test point at the interface of adhesive layer,and the effect of the heating and gasification process on the weld pool is analyzed. At the same time,the ultrasonic C scanning imaging test was carried out on the spot welding joint of SPCC plate with the ultrasonic water immersion focusing method. The features of nugget area were analyzed by A scanning signal and C scanning image. The results show that the average tensile strength of the adhesive joint and the spot welded joint are 10 518.325 N and 10 164.421 N respectively,and the strength of the spot welded joint is improved by adding the adhesive layer. In the bonding process,the high pressure gas from the adhesive layer is discharged from the gap between the upper and lower plates and leaves the cavity area around the weld core after the gas is discharged. Based on the characteristics of ultrasonic C scanning images,the adhesively bonded joints are divided into the conductive adhesive zone,the cavity region after the gasification of the adhesive layer,and the nugget region. The results of the test is in an agreement well with the simulated.
作者
韦涛
曾凯
冯煜阳
肖智杰
吴万平
Wei Tao;Zeng Kai;Feng Yuyang;Xiao Zhijie;Wu Wanping(Faculty of Mechanical and Electrical Engineering, Kunming University of Science and Technology, Kunming 650500, Chin)
出处
《机械科学与技术》
CSCD
北大核心
2018年第7期1115-1119,共5页
Mechanical Science and Technology for Aerospace Engineering
基金
国家自然科学基金项目(51565022)资助
