LUBRICATION AR-AUTOMATIC 2542654 - Caterpillar

Use the direct current electrode positive (DC reverse polarity) polarity setting and remove the slag after every pass. The weld pass size shall not exceed two times the electrode diameter.
As an alternate process the FCAW process may be used with E71T-1 (ANSI/A5.20) welding electrode and the manufacturers specified shielding gas (es). The weld deposited by three 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 in) 27 J (20 ft lb) Notch Toughness at -18°C (0°F) This type of electrode has limitations if it is used to carry larger weld pass volumes in the flat welding position. Due to the fast freezing characteristics of this electrode's slag system, there is a chance of trapping evolving gasses in the weld melt. Precaution should be taken by controlling weld pass size.Welding parameters will vary due to weld position and manufacturer of the welding electrode. For 1.30 mm (0.052 in) diameter electrode typical welding parameters should be:
Use the direct current electrode positive (DC reverse polarity) polarity setting and remove the slag after every pass. The weld pass size shall not exceed 8.0 mm (0.31 in) fillet volume.
Clean front shovel of oil, grease, paint, and dirt in the area to be welded. Attach the welding ground cable directly to the area to be welded. Attach the welding ground cable directly to the front shovel. Protect all machined surfaces from sparks or splatter produced by the welding, chipping, and/or grinding operations.
The welds shall be free from cracks, porosity, undercut, and incomplete fusion. All weld quality shall conform to ANSI/AWS D14.3 or Caterpillar Engineering Specification 1E99.
Procedure For Welding Of Plates To 5130 Excavator (Front Shovel)
Illustration 1. Typical view of front shovel bucket.
Illustration 2. Top view of front shovel bucket. Callout 1 designates 110-3143 Plates, Callout 2 designates 131-0492 Wear Plates and Callout 3 designates 131-5634 Wear Plates.
Illustration 3. Side view of outside of front shovel bucket. Callout 4 designates 110-3127 Plates, Callout 5 designates 110-3128 Plates, Callout 6 designates 131-0503 Wear Plate (LH), Callout 7 designates 131-0509 Wear Plate (RH) and Callout 8 designates 131-0507 Arm Plates.
Illustration 4. Weld tolerances for plates on front shovel bucket.
Illustration 5. View of section A-A. Callout 9 designates 110-3146 Plate and Callout 10 designates 131-0508 Wear Plates.
Illustration 6. View of Detail A.
Illustration 7. View of section B-B, inside side view. Callout 11 designates 131-5633 Wear Plates and Callout 12 designates 131-0506 Wear Plates.
Illustration 8. Weld tolerances for section B-B.
Illustration 9. View of Detail B. 1. Weld six 110-3143 Plates (1) and six 131-5634 Wear Plates (3) at locations as shown in Illustration 2, Illustration 5 and Illustration 9 using 8.0 mm (.31 in) fillet weld. Refer to Illustration 2, Illustration 9, Illustration 5, Chart 4 and Chart 5 for weld dimensions and weld tolerances.2. Weld four 131-0492 Wear Plates (2) at locations as shown in Illustration 2, Illustration 5 and Illustration 7 using 15.0 mm (.59 in) fillet weld. Refer to Illustration