CO2气保焊表面张力过渡的建模及仿真

Research on simulation for surface tension transformation in CO2 arc welding

关键词:  表面张力过渡  Simulink仿真  电流型逆变器  熔滴过渡  CO₂气保焊

Key words:  surface tension transformation  simulink simulation  current inventordroplet transformation  CO₂ arc welding

摘要:

表面张力过渡(也称STT)是CO₂气保焊中一种极低飞溅的过渡形式,它是基于熔滴过渡理论和电子化的焊接电源基础上发展起来的。该技术已应用于西气东输的管线打底焊接。作者在对CO₂气保焊表面张力过渡理论研究的基础上,利用Matlab软件建立了电源-电弧非线性系统模型,和电流型逆变器系统模型,对表面张力过渡过程中的燃弧、短路等各个阶段进行了仿真,研究了燃弧阶段熔滴长大对弧长的影响,液桥分断阶段输出电感对电流下降率的影响。研究表明液桥分断时,输出电感的大小是控制飞溅量的关键条件。将仿真波形与实际波形相比较,二者基本吻合。

Abstract:

Based on the study of droplet transfeormation and inverter arc welding power surface tension transformation (STT) in CO₂ arc welding which has very low spatter has been used in pipe root-welding.In this paper,a simulation model is presented for STT in CO₂ arc welding which integrates current inverter welding power and arc model,and is designed to simulate the effect of droplet to arc length in arc phase and the effect of conductor to the current decrease rate in short circuit phase.The result of simulation is almost same as experiment,and shows the conductor in output loop is a key to realize low spatter.