Tungsten Electrode Service Life and Its Value in Stainless Steel Pipe ProductionⅡ

This article will go on to describe the affecting reasons that the length of tungsten electrode service life on quality and productivity of pipe welds in “Tungsten Electrode Service Life and Its Value in Stainless Steel Pipe ProductionⅠ”:

(3) Under the sustained action of arc cathode up to thousands of degrees high temperature, the ends of the tungsten electrodes will eventually appear oxidized ablation. When the operator find that the shape of the ends of the tungsten electrode has changed and is not sufficient to ensure penetration quality, it is the time to shut down to replace or re-sharpen the electrode tip during continuous welded pipe production. This downtime often cause some scrap stainless steel tube, thus affecting the rate and productivity of the welded pipe.

(4) In the single pipe production, the length of each pipe is typically 4-6 mm. In order to improve productivity and reduce rework pipe volume, it should be avoided that a half-way cemented carbide inserts stop to replace the tungsten electrodes.

(5) In order to obtain as high welding speed and productivity pipe as possible, the parameter (big tungsten rod diameter and the highest allows use of welding current) is always chosen in accordance with the thickness of welded pipe. The results of a research institute showed that: the burning loss of cerium tungsten electrode (a diameter of 2.4 mm) is slightly larger than lanthanum tungsten electrode and yttrium tungsten electrode only when it’s current is more than 230A. However, if it is less than this current value, the cerium tungsten electrode is better than the above two. The former arc reliability is better than the latter one. This is because: tungsten, lanthanum, thorium electron work function, is respectively 4.5 eV, 3.3eV and 3.35eV, while cerium electron work function is only 2.6eV.



 

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