20) What diameter of cable is used to carry 300A with 0 to 15 meters long?

21) Which is chemical cleaning process?

22) What is the defect if metal flowing into the surface of the base metal without fusing it?

23) What is the defect if fusion does not take place up to the root of the weld?

24) What is the defect due to too much weld metal added to the joint that there is excessive weld reinforcement?