What causes worm holes in welds?

Related questions

1. What causes cracks in TIG welds?
2. What's better MIG or TIG welding?
3. What type of power source is used for GMAW?
4. Why do stainless steel welds crack?
5. Can you weld steel with TIG?
6. Is stick welding hard?
7. What is the difference between MIG and TIG welding?
8. Is TIG or MIG welding easier?
9. What causes cracks in steel?
10. What is crack in welding?

Tags

1. #hydrogen
2. #cause
3. #porosity
4. #originates
5. #solidification
6. #absorption
7. #oxygen
8. #released
9. #which
10. #shielding
11. #molten
12. #trapped
13. #become
14. #usually
15. #caused
16. #nitrogen
17. #metal