12) Which size of CCMS filler rod is to be used for welding plate of 8mm thick with ?V? edge preparation?

13) How many segments are to be selected for welding 50 mm j pipe?

14) What type of edge preparation is needed, for gas welding a pipe, with wall thickness 6mm?

15) How many equal divisions should be made while developing a 'T' pipe joint?

16) What is the name of small metal particles which are thrown out of the arc during welding?