钛合金胶接点焊接头的性能检测
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摘要
研究了不同焊接电流下钛合金板胶接点焊接头的A扫描信号和C扫描图像特征,并进行了拉伸-剪切试验。结果表明:通过观察C扫描图像的特征与A扫描信号的变化,能够划分胶接点焊接头的胶层区、热影响区、熔合区、熔核区以及焊接缺陷;随着电流(7~10 k A)的逐渐增大,接头熔核直径呈递增趋势,相应的失效载荷从7 231.5增加到10 939.0 N;当电流为7 k A时,在C扫描图像上反映出飞溅缺陷,此时接头失效载荷远小于没有出现飞溅的接头,可见飞溅降低了胶接点焊接头的拉剪载荷。
The quality of spot weld bonding in titanium alloy sheet metal was tested by using ultrasonic C- scan method. The specifics of the A- scan signals and the C- scan images were researched under different welding current. The tensile-shear tests were carried out to test the mechanical behavior of spot weld bonding. Results show that the characteristics of C- scan image and the change A- scan signal can divide adhesive,heat effected zone,melting area,nugget zone and weld defects. The nugget diameters of sport weld bonding increase with the increase of welding current,and the failure load average increase from 7 231. 5 N to 10 939. 0 N. When the current is 7 k A,it can get the information which includes splash and other weld defects from the ultrasonic C- scan image. The failure strength is less than the normal joints. The splash reduces the tensile shear load of the spot weld bonding joints.
The quality of spot weld bonding in titanium alloy sheet metal was tested by using ultrasonic C- scan method. The specifics of the A- scan signals and the C- scan images were researched under different welding current. The tensile-shear tests were carried out to test the mechanical behavior of spot weld bonding. Results show that the characteristics of C- scan image and the change A- scan signal can divide adhesive,heat effected zone,melting area,nugget zone and weld defects. The nugget diameters of sport weld bonding increase with the increase of welding current,and the failure load average increase from 7 231. 5 N to 10 939. 0 N. When the current is 7 k A,it can get the information which includes splash and other weld defects from the ultrasonic C- scan image. The failure strength is less than the normal joints. The splash reduces the tensile shear load of the spot weld bonding joints.
引文
[1]王华锋,王宏雁,陈君毅.胶接、胶焊与点焊接头剪切拉伸疲劳行为[J].同济大学学报,2011,39(3):421-426.
[2]殷勇,涂善东,朱进.胶焊单搭接头长时力学性能分析[J].航空材料学报,2001,21(3):57-62.
[3]WEI P S,WU T H.Electrical contact resistance effect on resistance spot welding[J].International Journal of Heat and Mass Transfer,2012,55(11/12):3316-3324.
[4]胡德安,李晶晶,陈益平,等.热补偿法对不等厚铝合金点焊力学性能的影响[J].热加工工艺,2014,43(3):174-176.
[5]方平,胡冬青,王杰,等.镀锌板胶接点焊工艺参数优化研究[J].热加工工艺,2011,40(11):112-114.
[6]DARWISH S,GHANYA A.Critical assessment of weldbonded technologies[J].Journal of Materials Processing Technology,2000,105(3):221-229.
[7]AL-SAMHAN A,DARWISH S.Strength prediction of weld-bonded joints[J].International Journal of Adhesion and Adhesives,2003,23(1):23-28.
[8]CHANG B,SHI Y,DONG S.Studies on a computational model and the stress field characteristics of weld-bonded joints for a car body steel sheet[J].Journal of Materials Processing Technology,2000,100(1):171-178.
[9]赵波,吕振华.多焊点情况下胶焊单搭接头的静力分析[J].应用力学学报,2009,26(2):239-242.
[10]胡文全,刘亚良,唐明忠.Q235薄钢板胶接点焊工艺及性能研究.热加工工艺,2011,40(23):161-163.
[11]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):71-75.
[2]殷勇,涂善东,朱进.胶焊单搭接头长时力学性能分析[J].航空材料学报,2001,21(3):57-62.
[3]WEI P S,WU T H.Electrical contact resistance effect on resistance spot welding[J].International Journal of Heat and Mass Transfer,2012,55(11/12):3316-3324.
[4]胡德安,李晶晶,陈益平,等.热补偿法对不等厚铝合金点焊力学性能的影响[J].热加工工艺,2014,43(3):174-176.
[5]方平,胡冬青,王杰,等.镀锌板胶接点焊工艺参数优化研究[J].热加工工艺,2011,40(11):112-114.
[6]DARWISH S,GHANYA A.Critical assessment of weldbonded technologies[J].Journal of Materials Processing Technology,2000,105(3):221-229.
[7]AL-SAMHAN A,DARWISH S.Strength prediction of weld-bonded joints[J].International Journal of Adhesion and Adhesives,2003,23(1):23-28.
[8]CHANG B,SHI Y,DONG S.Studies on a computational model and the stress field characteristics of weld-bonded joints for a car body steel sheet[J].Journal of Materials Processing Technology,2000,100(1):171-178.
[9]赵波,吕振华.多焊点情况下胶焊单搭接头的静力分析[J].应用力学学报,2009,26(2):239-242.
[10]胡文全,刘亚良,唐明忠.Q235薄钢板胶接点焊工艺及性能研究.热加工工艺,2011,40(23):161-163.
[11]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):71-75.