liquifies the metal for forming the abrasive surface allows transfer of the liquified metal and permits some penetration into the surface area to effect a welding bond of the liquified metal to the metal surface area or substrate may be used for example welding oxy fuel guns or arc or plasma spray systems may be employed by the present invention the most preferred method of application of the abrasive metal material is an arc spray system the abrasive material is loaded into an arc spray gun as a continuous wire feed the gun heats the wire with an electric arc to a temperature which liquifies the wire then under air pressure sprays it onto the target metal surface areas to produce a strong weld bond example of such arc spray gun is a hobart tafa model 9000 electric drive arc spray system hobart tafa technologies inc concord n h the model 9000 gun may be either a hand held or machine mounted unit this allows for maximum versatility the arc spray gun can reproduce optimum spray patterns for each composition of wire and thus produce the highest quality coating with the highest density and bond strength the use of small diameter wire such as about 1 mm to 2 mm provides a more uniform particle distribution in the spray pattern the spray pattern shape can be varied by adjusting the nozzle positioner insert and can be made fine or coarse by adjusting the air pressure.