Man
1.Why occur no welding 10 mm.
-Because operator welding not perform the process of welding perfect.
2.Why occur operator welding not perform the process of welding perfect.
-Because jumping the process.
3.Why occur jumping the process.
-Because The operator did not do checks the process of it.
4.Why occur The operator did not do checks the process of it .
-Because works operator negligent