Cause Analysis：

1. Excessive current used. Tungsten poles are used for a long time under high current conditions. When the temperature reaches the recrystallization temperature of tungsten grains (1600°C), the tungsten grains will become round and thick, and the tungsten poles will become brittle.

solution：

1. For long-term use, the current should be used near the allowable current of the tungsten needle.

Cause Analysis：

1. Horizontal sharpening, the wear scar is perpendicular to the axis of the electrode; 2. The wear scar is rough, resulting in scattered discharge points; 3. The pointed tip does not meet the requirements.

solution：

1. Use longitudinal sharpening; 2. Use a grinding wheel with smaller particles; 3. Determine the size of the sharpening part according to the arc concentration requirements.

Cause Analysis：

1. The tungsten electrode has pores; 2. the tungsten electrode is split; 3. the arc starting current is set too large.

solution：

1. Cut off the tip and sharpen it again; 2. Cut off the split and sharpen it or replace it with a new tungsten electrode; 3. Set the arc starting current to about half of the upper limit of the working current.

Cause Analysis：

1. The tungsten electrode has pores; 2. The sharpening point is not concentric; 3. There is a problem with the welding torch angle.

solution：

1. The tungsten electrode is not straight, it can be straightened by hand, and you can't find the manufacturer to replace it; 2. Use a sharpened tungsten electrode with high concentricity, and re-sharpened the tip in time after the mushroom head is generated during the welding process of the tungsten electrode tip; 3. Check the welding Adjust the torch angle in time.

Cause Analysis :

1. Excessive current; 2. Unskilled operation techniques, the tungsten electrode is in contact with the base material; 3. Wrong selection of the tungsten electrode, including diameter and variety; 4. The tungsten electrode protrudes too long; 5. The tungsten electrode sharpens too long; 6. The impure argon gas causes the tungsten needle to oxidize; 7. The flow of argon gas is too large or too small, which causes the tungsten needle to contact with the air, and the tip oxidizes.

solution：

1. Control the allowable current value to adjust the current; 2. Contact arc starting operation should be proficient or switch to high frequency, pulse arc starting, avoid tungsten electrode contact with the base metal during welding; 3. Choose a larger diameter tungsten needle, In the case of welding, choose pure tungsten electrode (green head) or zirconium tungsten electrode (white head); 4. The extension length of the tungsten electrode should be adjusted according to the argon gas flow and the size of the porcelain nozzle; 5. The sharpening angle should be appropriately increased. For details, see "Guide to the Shape and Angle of Tungsten Pole Sharpening"; 6. Ensure that the argon is dry and moisture-free, and the purity is above 99.9%; 7. Adjust the argon flow to moderate.

Cause Analysis：

1. Tungsten pole splits and splits.

solution：

1. Cut off the cracked place; 2. Find a manufacturer for replacement; 3. Perform flaw detection 100%.

Cause Analysis:

1. The tungsten electrode has pores; 2. the tungsten electrode is split; 3. the arc starting current is set too large.

solution:

1. Cut off the tip and sharpen it again; 2. Cut off the split and sharpen it or replace it with a new tungsten electrode; 3. Set the arc starting current to about half of the upper limit of the working current.