CYLINDER HEAD GP 3276910 - 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 8.0 mm (.031 in) fillet volume. Clean the frame of oil, grease, paint, and dirt in the area to be welded. Attach the welding ground cable directly to the area to be welded. 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.
The SMAW process shall be used with E7018 (ANSI/AWS A5.1) welding electrode The weld deposited by these electrodes will have the following minimum mechanical properties:500 MPa (72 KSI) Tensile Strength420 MPa (60 KSI) Yield Strength22% elongation to 50 mm (2 in)27 J (20 ft. lb) Notch Toughness at -29°C (-20°F)These are low hydrogen electrodes and must be stored in an 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 following chart relates to the electrodes diameter and approximate current settings for welding: