How to Repair Cracked Manganese Rolls

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Figure 2-67. Hard-Facing Crusher Roll Shells

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Welding Materials Handbook

Figure 2-69. Repairing Cracked Manganese Crusher Rolls

REBUILDING AND HARD-FACING CRUSHER

ROLL SHELLS (Continued)

3. Weld heavy 4 in. angle iron 1 in. from, and parallel

It is often desirable to stripe only one roll when

to, each side of the crack. Use electrode on page

extremely fine aggregate is being produced. A

1-27 to join angle iron to shell.

transverse deposit of hard metal is applied to the

entire surface of the smooth roll, using welding

4. Drill or bum 1-1/8 in. holes in each angle iron on 6

procedure outlined in the section on roll rebuilding.

in. centers to accommodate 1 in. bolts, Run bolts

The hard metal overlay should not be reapplied until

through angle irons and tighten nuts progressively

most of the previous metal has worn off. Otherwise,

to bring shell together.

severe cracking or spalling may occur.

5. Use electrodes on pages 1-22 or 1-20 to weld

How to Repair Cracked Manganese Rolls

shell. Use weave or oscillating beads to work out

all gas from molten puddle.

The following procedures describe how to repair

cracked manganese rolls (Figure 2-69).

6. Scarf off angle iron and rehard-face where

necessary.

Loosen all wedge bolts and wedges.

7. Secure wedge bolts and wedges.

2. Vee out the crack to provide a 600 angle for

welding. Remove all hard-facing adjacent to

and back about 6 in. from the edges of the

crack.

2-76