Study on new heating control method of rail AC flash welding

ZHANG Yang; LV Qibing; WANG Xiao; TAO Qiming

doi:10.7512/j.issn.1001-2303.2021.09.16

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Study on new heating control method of rail AC flash welding
Vol. 51, Issue 9, Pages: 85-90(2021)
Published：2021
DOI： 10.7512/j.issn.1001-2303.2021.09.16
稿件说明：

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DOI：

ZHANG Yang, LV Qibing, WANG Xiao, et al. Study on new heating control method of rail AC flash welding[J]. Eletric Welding Machine2021, 51(9): 85-90. DOI： 10.7512/j.issn.1001-2303.2021.09.16.

摘要

固定PLC扫描周期

基于伺服电磁阀

实现了一种基于电流反馈的钢轨交流闪光焊新型加热控制方式:焊机机头动端夹钳在固定振动的基础上叠加一个变速送进运动的加热控制方式

实现钢轨端面的快速高质量加热。采用红外热像仪采集原脉动加热工艺与该加热工艺高压阶段即将结束时的温度场并进行对比分析

结果表明:同样的加热时间条件下

新型加热控制方式高温区域宽度较原脉动闪光焊增加了13.82%以上。结合焊接曲线可知

新型加热控制方式通过提升最小电流值、减少断路时间的方式提高了加热效率

可快速建立高温温度场宽度。

Abstract

In this paper

a new heating control method of rail AC flash welding based on current feedback is realized by fixing PLC scanning period and servo solenoid valve. The moving end clamp of welding machine head is superimposed with a variable speed feed motion on the basis of fixed vibration

so as to realize the rapid and high-quality heating of the rail end surface. The temperature field of the original pulse heating process is collected by infrared thermal imager and compared with that the new heating process before the end of high voltage stage. The results show that under the same heating time

the width of the high temperature zone of the new heating control method increases by more than 13.82% compared with the original pulse flash welding. Combining with the welding curve

it can be seen that the new heating control method increases the thermal efficiency by increasing the minimum current and reducing the circuit breakage

which can quickly establish the width of the temperature field at high temperature.