1 WEAR-ARC™
Covered Electrodes
Introduction Surfacing
is the application of wear-resistant alloys to metal parts subject to destructive
wear caused by abrasion,
impact, compression, heat, or corrosion. The Wear-Arc electrodes are designed
for manual arc welding
for surfacing parts. Two types of overlay alloys are recommended to correct destructive
wear patterns:
Buildup Alloys
Because hardsurfacing alloys are limited
by maximum thickness of deposit, badly worn parts must be built
up prior to depositing the wear-resistant
material. Wear-Arc 3 IP, Nickel Manganese, and WH are designed
for buildup applications.
These alloys possess good deformation
resistance and provide a strong bond with the base metal. This
helps to prevent roll-over or spalling
and provides a sound base for hardsurfacing. Hardsurfacing
Alloys Hardsurfacing
alloys are designed to provide maximum resistance to specific wear factors or
combination of wear
factors. The performance of these alloys is in direct relation to the amount of
carbide forming elements present
in combination with carbon. The carbon reacts with the carbide forming elements—chromium,
tungsten, molybdenum, etc.—creating
hard carbides from which the overlay material derives its wear
resistance. These carbides are evenly
distributed in a matrix and as the ratio of carbides to matrix increases,
abrasion resistance increases and toughness
or ductility decreases. The
chart on the following page shows the relative impact resistance or “ductility”
and the abrasion or wear resistance
of the Wear-Arc line.
