Here are some causes of lack of penetration in welding. By knowing these causes, you can do preventive measures to avoid such welding defects;
1. Improper joints design
2. Too large root face.
3. Root gap too small.
4. Too small bevel angle.
5. Less arc current.
6. Faster arc travel speed.
7. Too large electrode diameter.
8. Longer arc length.
9. Incorrect polarity when welding with direct current.
10. Wrong electrode manipulation.