Hardfacing is a process of stacking a metal layer on the surface of a component by welding. It is an important and economical means of manufacturing and repairing in the machinery manufacturing industry. The purpose is to make the surface of the parts to obtain the deposited metal with special properties, such as wear resistance, heat resistance, corrosion resistance and so on.
In order to restore or increase the size of the parts, the alloy used for surfacing can be classified as iron base, nickel base, cobalt base, copper base and tungsten carbide.
The toughness of the iron base surfacing alloy is well matched with the abrasion resistance, and it can meet many different requirements, and the price is low and the variety is more. So the application of the nickel base and cobalt base surfacing materials is mainly used in the situations where the high temperature wear and corrosion are required.
The price of tungsten carbide surfacing material is high, mainly for the serious abrasive wear resistance of the workpiece. At present, surfacing has been widely used for surface strengthening and repair of rollers, wheel rim, crankshaft, tools and moulds.
When the die blade is surfacing, the cobalt base alloy is generally welded to the hot forging die and the hot shear die blade, and the nickel base or nickel based alloy is surfacing with the cold shear die edge.
选用韧性好.价格低的 钢或 钢作基体，在模具工作部分(如刃口)堆焊钴基合金，堆焊厚度为。
We choose the steel with good toughness and low price as the base and weld the cobalt base alloy in the working part of the die, for example, the thickness of the surfacing.
Thermal spraying is the use of heat sources to heat metal or non-metallic materials to the state of melting or semi melting. It is blown into tiny particles (atomization) by high speed airflow (in the spray gun) and sprayed to the surface of the workpiece to form a solid surface processing method for the cover layer.
This method can make the surface of the workpiece obtain various hardness, wear resistance, corrosion resistance, oxidation resistance, lubrication and other special physical and chemical properties. Many materials (metal, ceramics, plastics, cement, gypsum, wood, etc.) can be sprayed on the surface.
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