机械制造文摘——焊接分册
变极性TIG焊微电流短路引弧技术研究
姚瑶”，姚河清
（1.长沙学院机电工程学院，湖南长沙410003；2.河海大学机电学院，江苏常州213021）
专题研究
摘要：基于变极性TIG焊电弧的特点，在作者研发的双芯双逆变变极性TIG焊电源的基础上，设计出了一种针对变极性 TIG焊的微电流短路引弧方式，将整个引弧过程分为：短路阶段、维弧阶段和电流缓升阶段。可以有效的解决变极性TIC 焊在短路引弧时容易出现的钨极烧损、电流过冲等问题。并针对不同输出电源类型，不同被焊材料，进行了微电流引弧试验。试验证明：DCENDCEP，脉冲输出时均能实现短路电流为1~2A的微电流稳定引弧，未出现明显的钨极烧损，引弧成功率高并且没有出现熄弧的现象。
关键调：短路引弧；微电流；钨极烧损中图分类号：TH12
Researchoftinycurrentshortcircuitarcignitiontechnology
for variable polarity TIG welding
YaoYao'YaoHeqing
(1. Electromechanical Engineering College, Changsha University, Changsha 410003, China; 2. Electromechanical Engineering College, Hohai University, Changzhou 213021, China)
Abstract: Based the characteristics of variable polarity TIG welding, founded on the double-chip double-invert-er system which researched by writer, a tiny current short arc ignition with three stages was designed, the three stages are short stage, maintain stage and current slow rising stage, The problems of tungsten weariness,current rushing etc which appears easily during short arc ignition can be solved effectively. And tiny current arc ignition experiment was carry out based on different styles of current source and welded materials. The experiments proved: the arc ignition is stable when the current is 12 A with the strategy of the tiny current arc ignition, as the different sources of DCEN, DCEP and pulse, without any obvious tungsten weariness and arc extinguish, and the arc ignition success rate is quite high.
Key words: short arc ignition; tiny current; tungsten weariness
0前言
常用的TIG焊一般采用高频高压或高压脉冲等非接触引弧，可获得比较好的引弧效果；但它也具有对人体产生危害、干扰周边环境及设备等缺点，尤其是高频高压、高压脉冲在引弧时很容易造成逆变主电路中的
万方数据
电子元器件的破坏，据此，在使用变极性TIG焊焊接铝和铝合金时，采用短路引弧可以避免高频高压、高压脉冲对逆变电路的损坏[1]。
通常TIG焊接触短路引弧存在的间题有[2]，
（1）短路过程中容易造成电流冲击，导致钨极烧损，会形成焊缝夹钨，使焊接质量下降。（2）接触短路
2017年第2期11