When choosing a tungsten electrode, you should always pay attention to the following points:

1. The brighter and more uniform the surface, the less wear marks and black spots, and the better the tungsten electrode.

2. The less internal scars and the smaller the scars, the better the tungsten electrode.

3. The less the negative diameter difference, the more durable the tungsten electrode will be.

4. The internal molecular structure of annealed tungsten electrode is more stable, but because the requirements for sharpening are high and easy to fracture, it is not respected in China and mainly used for export requirements, so it is a technical difficulty to achieve molecular stability without annealing.

Principle: tungsten electrode welding is current through the entire length of tungsten electrode to the end, and therefore the greater the stability of the molecular structure of tungsten, the less the current value, the lower the power, thus the more durable, more surface and internal defects, in use, the greater the output current, the more the heat generated, the faster the loss, if internal flaws, cracks, welding current is big and instability, it's easy to have a partial arc, bifurcate, so after the inspection standard as one of the most important indicator of quality.