What is overlay welding?
A weld overlay is a type of cladding that uses a welding process to melt a material onto the surface of another, different material. The weld overlay layer is added as a cost-effective means to increase the base material’s corrosion-resistance or mechanical properties.
What is hard facing overlay?
Weld Overlay (WOL), also known as cladding, hardfacing, weld cladding, or weld overlay cladding, is a process where one or more metals are joined together via welding to the surface of a base metal as a layer.
What is difference between overlay and cladding?
Weld overlay is a welding process. It’s a process where you apply wear-resistant materials onto the parent component. Cladding is a process where you would apply a different, tougher material than the base metal or surface. Cladding’s main purpose is to act as a protective cover to the base metal.
What is hard surfacing in welding?
Hardfacing is a metalworking process where harder or tougher material is applied to a base metal. It is welded to the base material, and generally takes the form of specialized electrodes for arc welding or filler rod for oxyacetylene and gas tungsten arc welding welding.
What is CRA material?
A corrosion-resistant alloy (CRA) is an alloy consisting of metals such as: Chrome. Stainless steel.
What is a metal overlay?
This process is used to join one or more metals together by welding a thin stainless steel or nickel-base alloy layer to the surface of a backing material in order to create a stronger composite product. …
What is the advantage of hard facing?
Benefits of hardfacing include: reduced downtime, inventory and maintenance cost, increased plant availability and productivity, and a good number of service life extensions through timely reparatio service life extensions through timely reparation.
What is the benefit of hard facing?
In addition to extending the life of new and worn components, hardfacing lessens the need for replacement parts, increases the operation efficiency by reducing both downtime and overall costs, and allows for the use of a less expensive base metal.
How is hard facing done?
Hardfacing is the deposition of thick coatings of hard, wear-resistant materials on a worn or new component surface that is subject to wear in service. Thermal spraying, spray-fuse and welding processes are generally used to apply the hardfacing layer.
What is CRA overlay?
The CRA overlay process is the deposition of corrosion-resistant alloys through welding. You can accomplish it by using or utilizing different welding processes, which may include: Submerged Arc Welding (SAW) Metal Inert Gas Welding (MIG)