熔化极气体保护焊焊丝伸出长度和电弧弧长的稳定性

Sability of wire extension and arc length with GMA welding

本文采用典型的焊丝熔化率半理论公式和自己测得的有关常数计算了熔化极气体保护焊时，稳定的焊丝伸出长度和焊丝伸出长度的恢复时间常数，并利用电弧照像法，电弧高速摄影和高速现象分析装置进行了大量的试验验证，研究了熔化焊丝中的电阻热对电弧弧长稳定性的重要影响。

The typical half theoretical formula of wire melting rate and measuredrelevant constants are used for calculating stable extension of wire and it' s reco vervtime constant in GMA welding. Then the calculated results are examined by using arcphotography arc high speed cine camera and high speed event analyser. The effects ofresistance heat of wire extension on stability of arc length are discussed.