The type of coated electrode most widely used for welding low carbon steel is

Filler material is ......... A...... in resistance welding and the heat generated in the process is directly proportional to ........ B.........

(A). used / not used$$\,\,\,\,\,\,\,\,\,$$ $$\,\,\,\,\,\,\,\,\,$$ (B). square of the current / cube of the current

The joint configuration best suited for adhesive bonding is

High alloy steel components are preheated before welding for reducing