三相次级整流点焊质量监控的可视化

Quality Control Visualization of Direct Current Spot Welder with Secondary Rectification

关键词:  点焊机  次级整流  焊接电流  可视化  串行通讯

Key words:  spot welder  secondary rectification  welding current  visualitation  serial communication

摘要:

在重要零部件电阻焊过程中,监控参数的可视化有助于在线评估焊接质量。本文讨论了用VisualBasic 6.0在PC机上实现串行通讯和焊接电流波形显示的软件方案;分析了典型单脉冲、双脉冲、2周期单脉冲焊接电流波形和网压上升,下降时的监控/不监控对比波形,以此直观地说明三相次级整流点焊的主要特征和优势,以及恒流监控的效果。所讨论的方案已成功运用于三相次级整流点焊机控制系统,并服务于某重要产品铝合金壳体焊接。在实践中,焊接电流波形显示和存档成为操作和检验人员进行焊接质量控制的重要辅助手段。

Abstract:

Direct current spot welder with secondary rectification is more and more widely used in the industry because of its high power factor and balanced load on three phases. In spot welding of important assemblies, the visualization of quality control is helpful to the online welding quality evaluation. This paper discuses the soft ware realization of serial communication and welding current waveform display with VB6.0 on Personal computer, analyzes resulted waveforms such as that of the typical single pulse, typical dual pulse, single pulse per two cycles, and the effect of constant current control while power voltage increasing or decrea-sing. These waveforms directly explain the major characteristics and advantages of the three-phase secondary rectification. The developed system has been successfully used in the spot welding of aluminum frames of a large sized rocket.The welding current waveform displaying and filing system have become an important auxiliary quality evaluation measure for welding operators and quality inspectors.