SPCC胶接点焊胶层气体的排出及超声C扫检测分析
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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.
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.
引文
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[3]Liu L M,Ren D X.A novel weld-bonding hybrid process for joining Mg alloy and Al alloy[J].Materials&Design,2011,32(7):3730-3735
[4]胡文全,刘亚良,唐明忠.Q235薄钢板胶接点焊工艺及性能研究[J].热加工工艺,2011,40(23):161-163Hu W Q,Liu Y L,Tang M Z.Study on spot weld bonding process for Q235 steel sheet and its properties[J].Hot Working Technology,2011,40(23):161-163(in Chinese)
[5]马轶男.激光点焊-胶接复合连接特性及接头断裂机制研究[D].哈尔滨:哈尔滨工业大学,2015Ma Y N.Research on characteristics and fracture mechanisms of laser spot weld bonding[D].Harbin:Harbin Institute of Technology,2015(in Chinese)
[6]刘申,马轶男,陶汪,等.钛合金激光点焊-胶接复合接头组织性能研究[J].中国激光,2014,41(12):1203004Liu S,Ma Y N,Tao W,et al.Study on microstructure and properties of titanium laser spot weld-bonded joint[J].Chinese Journal of Lasers,2014,41(12):1203004(in Chinese)
[7]Reverdy F,Hopkins D.Inspection of spot welds using an ultrasonic phased array[C]//Proceedings of 2004 AIP Conference Proceedings Quantitative Nondestructive Evaluation.American Institute of Physics,2004:801-808
[8]Song Y K,Hua L,Wang X K,et al.Research on the detection model and method for evaluating spot welding quality based on ultrasonic a-scan analysis[J].Journal of Nondestructive Evaluation,2016,35(1):4
[9]陈振华,史耀武,赵海燕.薄镀锌钢板点焊超声成像分析[J].机械工程学报,2009,45(12):274-278Chen Z H,Shi Y W,Zhao H Y.Ultrasonic imaging analyses of spot welds on galvanized steel sheet[J].Journal of Mechanical Engineering,2009,45(12):274-278(in Chinese)
[10]张龙,曾凯,何晓聪,等.基于超声波C扫描的SUS304不锈钢板点焊接头质量分析[J].宇航材料工艺,2016,46(2):71-75Zhang L,Zeng K,He X C,et al.Analyses on joint quality of spot welds on SUS304 stainless steel based on ultrasonic C-scan[J].Aerospace Materials&Technology,2016,46(2):71-75(in Chinese)