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Answer the following questions in brief:

1. What are the requirements of good weld?

2. How many types of arc welding defects ? Name them.

3. What are the causes of crater in end of weld?

4. Write the definition of undercut and overlap.

5. What type of defect occurred in welding if damp electrode is used?

6. Write the main causes of slag inclusion.

7. Write a short note on effects of faults in arc welding.

8. Write the remedies of blow holes.

9. What is the difference between porosity and blow holes?

10. List out the internal defects in MMAW.