Similar metal

Dissimilar metal

Non metal group

Any metal flat type

Iron

Ruby

Copper

Stainless steel

Pipe and round rods

Flats and square roof

Think sheet

Heavy sheet

One member stationary and another rotating type

Both members rotates

Both members are heated

One member is heated and another rotating

Seam welding

Friction welding

Flash butt welding

Spot welding