Failure of Tungsten Electrodes under High Pressure Environment

There are several conclusions discussed below on failure research of the tungsten electrodes under high pressure environment:

(1) Failure form of tungsten electrodes are three forms, showed in the following: tungsten electrodes melting, tungsten electrodes erosion and tungsten electrodes tip stick on metals. Among them, tungsten electrode melting account for about 1%; tungsten electrode erosion possesses the largest proportion, which is 90%, the tip will blunt after the tungsten electrode erosion; while the proportion of tungsten electrode tip stick metal is 9 percent, tungsten electrode which sticking to the metal can no longer arc.

(2) Gives the geometric criterion of tungsten electrode failure.

(3) Under high-pressure conditions, there are a lot of factors affecting tungsten electrodes failure, such as, protective gas effects and workpiece surface status. You can use the following methods to study measures to prevent the failure of tungsten electrodes: establish tungsten electrode failure fault tree under high pressure conditions, conduct quantitative and qualitative analysis of fault tree to identify the minimum cut set, and then calculate the structure importance coefficient of the events. Eventually, develop relevant measures to prevent the tungsten electrode failure on the basis of the aforementioned analysis.



 

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