What is hardfacing, and where is it used?

• A. Welding a wear-resistant overlay on surfaces exposed to abrasion or wear to extend life.
• B. Applying paint to metallic surfaces.
• C. Increasing the weld thickness without wear resistance.
• D. Grinding to remove wear.

Answer: (A)

Hardfacing means welding a hard, wear-resistant material onto a base surface to create a protective overlay. This overlay is placed on surfaces that endure abrasion, erosion, or impact so the component lasts longer in service. The hardfacing material is typically a specialized alloy—such as chromium carbide, tungsten carbide, or nickel- and cobalt-based alloys—applied by welding processes like shielded metal arc welding, gas metal arc welding, or flux-cored welding. You’ll see it on parts such as crusher liners, chute lips, excavator bucket edges, and other wear-prone areas of heavy equipment. The goal is to provide a durable surface that resists wear while preserving the original base material, unlike simply painting or increasing weld thickness without adding wear resistance, or performing grinding as a repair step.