Dynamic Characteristics Analysis of Resistance Spot Welding of Aviation Titanium Alloy

doi:10.3901/JME.2025.16.166

Abstract

Abstract: At present, there is a lack of systematic research on the law of multi parameter dynamic characteristics in resistance welding.The dynamic characteristics in the resistance spot welding process of titanium alloy are closely related to the welding quality. The dynamic information is obtained by using the data acquisition system and visualization function of the intelligent three-phase secondary rectifier spot welding machine. The characteristics of each stage in the spot welding process are analyzed. The dynamic characteristics and variation rules of electrode pressure, welding current and electrode displacement under different process parameters during the energized welding stage are compared and studied, and the dynamic characteristic quantities reflecting the quality of the spot welding are extracted. The results show that the dynamic change of pressure is synchronous with the welding current, while the electrode displacement lags behind the welding current. The dynamic change range of the average pressure value per power cycle, current root mean square(RMS) and electrode displacement change characteristics is relatively large in the early stage of the whole power on period, and the later stage changes smoothly. The dynamic characteristics such as pressure variation, current RMS change rate, displacement rise rate and maximum displacement during the welding process are greatly affected by the spot welding process parameters such as welding pressure, current and welding time, thus affecting the final quality of spot welding, which can be used as the index for welding quality assessment. It provides a basis for online quality monitoring of titanium alloy spot welding.

Key words: titanium alloy, spot welding process, electrode displacement, dynamic characteristic quantity, quality assessment

CLC Number:

TG453

YI Runhua, DENG Lipeng, LIU Fencheng. Dynamic Characteristics Analysis of Resistance Spot Welding of Aviation Titanium Alloy[J]. Journal of Mechanical Engineering, 2025, 61(16): 166-179.

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