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

Tungsten electrode service life refer to welding time that after a cutting grinding and under arc conditions, tungsten electrode end shape is stable and allows continuous or accumulated stainless steel pipe welding. Whether during single or continuous welded pipe production, the length of the time will directly affect the quality and productivity of pipe welds, this is because:

(1) In the GTAW(namely Gas Tungsten Arc Weld) production and applications, if the end shape of the tungsten electrode is changed, then its arc shape will change as well, that is to say, current density distribution, the current field shape, the size of Plasma air drag force and electromagnetic force (Lorentz magnetic) field distribution in the arc will change.

(2) In the PAW (Plasma Arc Welding) production and application, if the shape of the tungsten electrode tip is changed, the central position of electrodes material tip and its effective neck-in will produce offset within the plasma welding torch, resulting in a plasma arc is compressed and its flow power fluctuations, thus affecting the keyhole effect, that is to say, it will have an influence on the stability of the weld penetration quality.、


 

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