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

50) In resistance welding due to the resistance to the flow of current ______ is produced

51) In resistance welding which of the following is/are required for welding operation.