45) The slag formed in case of metallic arc welding must have ______ fluidity.

46) In case of metallic arc welding the electric current may be

47) In metallic arc welding when electrode is connected to negative terminal of the electric supply, maximum heat is produced at

48) In metallic arc welding when electrode is connected to positive terminal of electric supply maximum heat is produced at

49) In resistance welding process heat is produced by the resistance offered by ______ for the flow of electric current throught it