COVER 1653853 - Caterpillar

Illustration 1.
Service Plate [10.0 mm (.39 in) thick].(A) R 430.0 mm (16.90 in).(B) R 330.0 mm (13.00 in). (C) 120.0 mm (4.70 in).(D) 100.0 mm (3.90 in).(E) 100.0 mm (3.90 in).All dimensions are 3.0 mm (.12 in).2. Read the weld instructions which follow after Illustration 2. Weld the fabricated service plates to the blade beams of the circle assembly using a continuous 8.0 mm (.30 in) fillet weld. Keep the weld 10.0 mm (.40 in) from the edge of the blade beam. Do not weld the ends. See Illustration 2.
Illustration 2.
Circle assembly with service plates on blade beams. Use 8.0 mm (.30 in) fillet weld. No weld on ends depicted with arrows. Keep weld 10.0 mm (.40 in) from edges. Refer to Service Magazine, SEPD0385; October 6, 1997; Page 44; "Proper Welding Procedure on Machines and Engines With Electronic Controls".Welding Requirements
Protect yourself and others; read and understand this warning. Fumes and gases can be dangerous to your health. Ultraviolet rays from the weld arc can injure eyes and burn skin. Electric shock can kill.
Read and understand the manufacturer's instructions and your employer's safety practices. Keep your head out of the fumes. Use ventilation, exhaust at the arc, or both, to keep fumes and gases from your breathing zone and the general area. Wear correct eye, ear and body protection. Do not touch live electrical parts.
Refer to American National Standard Z49.1 "Safety in Welding and Cutting" published by the American Welding Society, 2501 N.W. 7th Street, Miami, Florida 33125.
Refer to OSHA Safety and Health Standards, 29 CRF 1910, available from the U.S. Department of Labor, Washington, D.C. 20408.
Welding operator personal protection should be provided to assure that the total weld fume in the operator's breathing zone does not exceed OSHA limits.All repair welding operators must be qualified for groove and fillet welding, as outlined in the current ANSI/AWS D14.3. The qualification will be for the SMAW (Shielded Metal Arc Welding) process in the vertical welding positions. The welding operator must also have used this welding process during the last six months or be re-certified for this process before welding. Documentation must be maintained of the weld operators qualifications. The alternate process for this repair could be FCAW (Flux Cored Arc Welding).
The area to be welded and the surrounding area must be at a minimum temperature of 16°C (60°F) before and during all welding.
Since weld distortion is a possibility, minimizing the heat into the surrounding area is important.The SMAW process shall be used with E7018 (ANSI/AWS A5.5) welding electrode. These are low hydrogen electrodes and must be stored in a electrode oven at 121°C (250°F) when not in use. If the electrodes get damp, scrap or recondition them to the manufacturer's specifications.
The weld deposited by these electrodes will have the following minimum mechanical properties:
* 500 MPa (72 KSI) Tensile Strength* 420 MPa (60 KSI) Yield Strength* 22% elongation in 50 mm (2 inch)* 27 J (20 lb ft) Notch Toughness at -29°C (-20°F)The following chart relates to the electrodes