Q. What are the three causes of non-relevant indications? (Solved)
1. Lack of fusion, change of section thickness, grinding cracks
2. Change of section thickness, very high amperage, drilled hole near surface
3. Very high amperage, drilled hole near surface, blow holes
4. Drilled hole near surface, very high amperage, lack of fusion
- b. Change of section thickness, very high amperage, drilled hole near surface