BRACKET 4923334 - Caterpillar

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View of detail A
(A) Subframe
(B) Weld treatment areas
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Weld treatment area location (top view of detail A)
(B) Weld treatment areas
(C) 485 10 mm (19.1 0.4 inch)
(D) 350 10 mm (13.8 0.4 inch)Treat the weld in the identified treatment areas shown in Illustrations 5, 6, and 7. Extending the treatment out of this area is acceptable. This area defines the minimum requirement. Follow the instructions in either Section "Toe Grinding Instructions" or "Needle Peening Instructions" to complete the subframe weld treatment.Toe Grinding Instructions
Toe grinding, besides removing minor imperfections, will improve fatigue strength of the weldment by 30%. Care should be taken not to overheat the ground surface until the surface becomes discolored. Avoid leaving deep grinding marks that can act as stress concentrators.
Inspect the weld in weld treatment area (B). Repair the weld prior to toe grinding if any visible discontinuity of the weld is shown.
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Typical view of carbide cutter
Use a grinder with a carbide cutter head with a minimum working diameter of 6 mm (0.24 inch) in order to ensure that the minimum toe radius is maintained.Note: Only steel carbide cutters are permitted for toe grinding. Abrasive grinding disc, stones, wheels, or cutters shall not be used.
Locate the weld toe treatment area (B) and choose a starting point from either end, refer to Illustration 7
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Toe grinder position
(E) 45 degree to 65 degree angle
Position the grinder at approximately 45 degree to 65 degree angle to the weld toe while splitting the included angle between the base metal and the weld. Refer to Illustration 9.
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Grind requirements
(F) 0.5 mm (0.02 inch) Minimum Depth
(G) Grind area
(H) Weld
The minimum depth of grinding shall be greater than 0.5 mm (0.02 inch) below the weld toe to base plate interface or until all traces of the original weld toe have disappeared, but no greater than a maximum of 2 mm (0.08 inch) grinding depth. Refer to Illustration 10.
The depth of the grind should be gradual along the length of the weld until the required depth and radius are achieved.
Use an undercut gauge capable of measuring 0.5 mm (0.02 inch) undercut in order to measure the grind depth.
Repeat Steps 1 to 7 on the opposite weld treatment area (B).
Inspect the grind area to ensure that no defects are present.
Prime and paint weld areas.Needle Peening Instructions
Note: Needle peening should not be done if the temperature is below 5° C (41° F).
Inspect the weld in weld treatment area (B). Repair the weld prior to needle peening if any visible discontinuity of the weld is shown.
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Example of a needle peening tool
(M) Needle peening tool
Use needle peening tool (M) with 3 mm (0.12 inch) diameter needles and radius ends. Refer to Illustration 11.
Set the air pressure between 550 kPa (80 psi) and 690 kPa (100 psi).
Locate the weld toe treatment area (B) and choose a starting point from either end, refer to Illustration 7
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Needle peening position
(L) Weld toe
(M) Needle peening tool
Begin peening weld toe using a tool angle as shown