around filled with a powdered mix of the desired alloys and turned over to seal the same and provide a cored wire with the above ranges of elements in the process of the present invention it is not necessary to heat the substrate prior to the spraying process nor is it necessary to subject the coated substrate with further treatment in an oven by adjusting the voltage a granular surface can be obtained which has been found to further improve wear as opposed to a completely smooth surface while not wishing to be bound by any theory it is believed that the granulated surface tends to hold dirt as the ground engaging tool passes through the ground and to cause a great deal of the work to be absorbed by particles held in the rough surface the presence of up to 3 of fluoride tends to intensify the arc and thereby induces the viscosity and surface tension of the molten metal another method has been discovered which tends to retain a ground engaging tool such as a disc in a perpetually sharp condition returning to the drawing it can be seen that one side of the substrate which is a ground engaging harrow disc has been coated to the edge thereof the other side has not been coated thus when the harrow disc is used the uncoated side of the cutting edge wears away faster than the coating in this way.