GMAW焊高速旋转电弧传感信号特征分析

Sensing signal pattern analysis of high-speed rotational arc in GMAW

关键词:  电弧传感  数学模型  焊缝跟踪

Key words:  arc sensing  mathematical model  seam tracking

摘要:

电弧传感直接使用焊接电信号进行焊缝跟踪,旋转电弧还可用于改善焊缝成形,具有重要的应用价值.基于气保护熔化极焊接(GMAW)的数学模型以及焊丝端部的运动学模型,对旋转电弧传感的电流信号进行了模拟.在不同焊接参数下进行了焊接试验,采集了电流波形.结果表明,数值模拟结果与实际焊接电流波形吻合.电弧传感电流波形左右半周的不对称性与焊炬偏差成正比.电弧旋转频率越高,电流变化幅度越小.旋转半径越大,电流波形的不对称性越明显.研究结果对于高速旋转电弧传感系统的设计具有指导意义.

Abstract:

Welding electrical signals are used directly by arc sensor to track weld seams. Rotational arc has great importance because it can be further used to improve the weld bead appearance. The current signals are simulated based on the mathematical model of gas metal arc welding (GMAW) and the dynamic model of wire tip motion. Welding experiments with different welding parameters have been performed and the welding waveforms have been acquired. The results show that the simulated current waveforms are consistent with the acquired waveforms in experiments. The asymmetry of current waveform in each arc rotating cycle is proportion to the torch deviation. The higher the arc rotating speed is,the smaller the current amplification is. The bigger the rotating radius is,the higher the sensitivity of the arc sensor is. The results of this work are helpful to the design and application of high speed rotational arc sensor systems.