Hardfacing Selection Simplified - 5/23/2012
In order to recommend the proper choice of hardfacing material for welding and joining applications, it is crucial to understand the environment to which the piece is exposed during operation. Dave Kiilunen, metallurgist and vice president at Cor-Met Inc. offers guidance on selecting hardfacing materials for shielded metal arc welding (SMAW) and flux-cored arc welding (FCAW) processes in his article "Determining The Correct Hardfacing Product." The article appears in the Spring 2012 issue of Welding & Gases Today, the leading magazine for the gases and welding equipment industry.
Hardfacing is the addition of a wear-resistant coating to a surface to resist abrasion, impact, erosion, galling or cavitation. Available forms of hardfacing are covered electrodes, cored wire, solid wire, cast rods and powders. These hardfacing materials can be applied by many welding processes.
In order to make recommendations to customers, gases and welding salespeople must consider factors such as application, wear resistance and cost. Cost is always a consideration of the alloy used for hardfacing. Kiilunen asks, "How long does it really have to last? Many applications can be rewelded multiple times during the life of the part. It may be a once and done. Generally the greater the wear resistance, the higher priced the product is due to a greater amount of alloy in the hardfacing product."
The application for hardfacing could involve a fabrication or joining operation. Kiilunen points out that there are weld-overlayed sheets of chrome carbide for abrasion resistance that can be cut to form a fan, bucket, chute or other processing equipment.
To learn more about selecting a hardfacing material, read "Determining The Correct Hardfacing Product" at Welding & Gases Today Online
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