| 点焊接头剪切拉伸试验试件临界宽度 |
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| 引用本文： | 崔学团,赵玉津,罗震,颜福裕,敖三三,罗彤.点焊接头剪切拉伸试验试件临界宽度[J].焊接学报,2016,37(4):61-64. |
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| 作者姓名： | 崔学团 赵玉津 罗震 颜福裕 敖三三 罗彤 |
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| 作者单位： | 1.天津大学材料科学与工程学院, 天津 300072 |
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| 基金项目： | 国家自然科学基金资助项目(50975197,51275342) |
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| 摘 要： | 通过对比发现电阻点焊剪切拉伸试验关于试样尺寸的标准并不统一.以普通的Q235镀锌钢为材料进行电阻点焊接头的剪切拉伸试验,检测了点焊接头抗拉载荷及其对应的引伸计位移量(抗拉位移)和失效吸收能随试件宽度的变化趋势,并从力学角度解释了产生这种变化趋势的原因.结果表明,这3个检测量趋于恒定时宽度对应着一致的临界值.如果试样宽度不足,试件变形使熔核旋转过量产生正向拉伸的分力,导致测量结果小于接头实际抗剪拉伸强度.
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| 关 键 词： | 电阻点焊 剪切拉伸 力学性能 临界宽度 |
| 收稿时间： | 2014/7/15 0:00:00 |
Critical width of tensile-shear test specimen for resistance spot welding joints |
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| CUI Xuetuan,ZHAO Yujin,LUO Zhen,YAN Fuyu,AO Sansan and LUO Tong.Critical width of tensile-shear test specimen for resistance spot welding joints[J].Transactions of The China Welding Institution,2016,37(4):61-64. |
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| Authors: | CUI Xuetuan ZHAO Yujin LUO Zhen YAN Fuyu AO Sansan and LUO Tong |
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| Affiliation: | 1.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China2.School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China;Department of Mechanical Engineering, University of South Carolina, Columbia 29208, China3.Detection Center of Natural Gas Branch Company of Daqing Oil Field, Daqing 163000, China |
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| Abstract: | It is found that the standard of shear tensile test of resistance spot welding is not uniform. The material used was galvanized Q235 stainless steel. The trend of failure load, failure displacement and energy absorption with the change of the width of the specimen were detected. The reasons for this change is oxplained in the mechanical point of view. There is a critical width when these three variables reach constant values. If the specimen width is not enough, the specimen deforms greatly. Nugget rotation results in a opening force, leading to the tensile shear measurement is less than the actual strength of the joints. |
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| Keywords: | resistance spot welding tensile-shear test mechanical performance critical width |
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