Depending on the use of the workpiece to be hardfaced, the weld metal shall meet the most varied demands. These can be cited as follows:

  1. Hardness in the As-Welded Condition
  2. Red Hardness under Thermal Loads
  3. Resistance to Metal-to-Metal Wear
  4. Abrasion Resistance to Frictional and Grinding Wear
  5. Impact Strength
  6. Corrosion Resistance
  7. Resistance to Scaling

In some cases, more than one of these modes of load may occur simultaneously, so that the weld metal must posses the respective properties. Hence, a conscientious selection of the proper weld metal will be a must. Of course, there doesn't exist a weld metal possessing all these properties in full measure. Nevertheless, in most cases it will be possible to find a satisfactory compromise in practice.