If the plating runouts are blended or machined to remove the abrupt plating edge, the techniques must be well controlled to avoid damaging the adjacent base metal.

The joint which is connected by welding method is called the welding joint, which is composed of welding seam, fusion zone, heat affected zone and its adjacent base metal.

The experimental results show that the surface hardened layer consists of non-full transformation area which is adjacent to the base metal and surface full transformation area.