What do you know about wear resistant weld overlay steel plate hardness and welding wire

Hardness of wear resistant steel plate welding layer for the Wear Resistant Bi-Metallic Plate

The hardness is affected by the surfacing material and welding process, and the hardness increases with the increase of the cooling rate if the material has good hardenability while maintaining same welding material.

The thermal efficiency of open arc welding has not been reported, but in practice,it is roughly equal to that of the submerged arc welding method. Although it does not need to melt the flux, we still lost a part of heat through radiation.
The welding wire diameter for open arc welding ranges from 2.4mm to 3.2mm, the welding process is very strict with performance of the welding machine as well. The composition of the alloy elements in the deposited metal is generally lower than that of the welding wire, so that the alloy content is limited.