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 SHOVEL PARTS AND ACCESSORIES
(Continued)
without imposing wear on the base metal between the
hard-facing is applied, alter the pattern as required and
check results against previous application.
beads.
Recommended Alloys:
Another effective hard-facing pattern is the use of
small dots of hard metal alloy spaced close together.
This method produces an effective hard-facing pattern,
For relatively moderate wear, use electrodes on page
while reducing the heat input from the welding
1-25 as a primary choice, and electrodes on page 1-22,
or 1-27 as alternate choices. For extreme abrasion, use
operation. Chance of overheating high grade steel
electrodes on page 1-26 as a primary choice and
used in some buckets is practically eliminated.
electrodes on pages 1-27 or 1-22 as alternate choices.
The dots arc first applied on wide centers, the welder
Skip weld on manganese buckets to avoid
gradually fills in the spaces until the area to be
overheating. Where possible, position for downhand
hard-faced is covered with closely spaced dots of hard
welding.
metal (Figure 2-22).
Wear Plates:
Successful hard-facing patterns are found by trial and
error. What works in one instance may not in another.
Use stainless steel electrodes on page 1-20 to weld
wear plates to worn buckets. For best service life,
Knowing the type of wear encountered, how it is
imposed, and the proper alloy to use, will help to apply
hard-face wear plates as described above.
the most effective bead pattern. Check the service life
received and the wear pattern developed. Next time
2-32
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