点焊接头冲击试验机的研发与应用

Development and application of impact testing machine for spot-welded joints

为评价点焊接头的冲击性能,研发一台摆锤式冲击试验机和冲击夹具.利用Lab VIEW软件和高速数据采集卡,开发了试验机的逻辑控制软件、人机界面、数据采集和处理系统,上述硬件设备和软件组成完整的点焊接头冲击性能测试系统.利用所研制的试验机对DP980材料的点焊试样进行冲击测试试验,得到了不同点焊电流条件下拉伸-剪切冲击性能评价参数.详细对比分析了采用不同测量或计算方法所获得的冲击力、摆锤最大剩余摆角以及总冲击吸收功.结果表明,试验机测量的冲击力是可靠的,数据分析处理算法是合理的,其测试结果可用于点焊接头冲击性能的评价.

In order to research and evaluate the impact properties of resistance spot-welded joints,a pendulum impact to test machine and fixtures was developed. And the control system,human-machine interface,data acquisition system and data processing algorithm were also developed based on the Labview software and high speed data acquisition card. All the above hardware equipment and software constitute an integrated system for the performance testing of spot-welded joints. With the testing machine,the impact properties of DP980 specimens welded with different currents were measured. Based on the measured data,the consistency of the impact forces,maximum swing angles and total absorbed energies measured and calculated with several different methods were compared and analyzed in detail. It is concluded that the measured impact force is reliable,the data processing algorithm is correct,and the testing results can be used for evaluating the impact properties of spot-welded joints.