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

High alloy steel components are preheated before welding for reducing

In spot welding of aluminium sheets, the welding current should be .........A........ and weld time should be kept ............B......... than for $$MS$$ sheet of same thickness.

(A). higher / lower, (B). higher / lower

Continuous rails for Indian railways are welded by ........ Welding process.