he parts to be welded are pressed on preheated plate for predefined time for sufficient plastic material to melt. Then the heated plate is withdrawn and the slightly melted surface of two parts is pressed together to form a joint. Plastic welding using hot plate welding is useful where plastic parts have complex geometries, like curved surfaces and internal walls or any irregular shapes. This process is employed where both high strength joints and hermetic seals are required.

Typically hot plate plastic welding is employed where cost effective strong seals are required like fuel tanks, liquid reservoirs, tail light lenses, vent ducts, batteries etc.