CAGE 4S6408 - Caterpillar

All grease, paint, and foreign objects must be removed before welding. Any of these materials will discharge gas which will cause porosity in the weld deposit. Water and rust will cause hydrogen embrittlement. Hydrogen embrittlement causes cracks in the weld deposit.Remove foreign objects with a wire brush, a buffer, or a grinder. Shot blasting the appropriate areas will also remove foreign material.Remove any oil or grease with a Caterpillar approved solvent.Welding on Machines and Engines with Electronic Controls
Proper welding procedures are necessary in order to avoid damage to the electronic controls and to the bearings. The following steps should be followed in order to weld on a machine or an engine with electronic controls.Note: If you are welding on a work tool, Caterpillar recommends removing the work tool from the host machine before welding.
Turn off the engine.
Turn the battery disconnect switch to the OFF position. If there is not a battery disconnect switch, then remove the negative battery cable at the battery.
Clamp the ground cable from the welder to the component that will be welded. Place the clamp as close as possible to the weld. Make sure that the electrical path from the ground cable to the component does not go through any bearing. Use this procedure in order to reduce the possibility of damage to the following components:
Bearings of the drive train
Hydraulic components
Electrical components
Other components of the machine
Do NOT use electrical components (ECM or sensors) or electronic component grounding points for grounding the welder.
Protect any wiring harnesses from the debris which is created from welding. Protect any wiring harnesses from the splatter which is created from welding.Installation Procedure
Use ASTM A572 Grade 42 or 50 steel, or equivalent steel with a minimum of 290 MPa (42000 psi) yield strength.Note: All areas must be free of rust, clean and free of paint prior to any welding operation.Note: It is not recommended to use stick welding (SMAW) near the foot casting due to higher carbon content.Note: Use LB-26 (AWS E7016 or AWS E7018) Electrodes or equivalent electrodes. Basic welding wire ESAB OK tubrod 15.00 with a 1.2 mm (0.05 inch) diameter can also be used. The basic welding wire must be the equivalent to AWS A5.20 E71T-5 with negative polarity. The welding wire must be protected with CO2 or Argon/CO2 80/20 gas.
Illustration 1 g01943582
(5) Tack weld
Illustration 2 g01943608
No gap between block and plate
Place a tack weld (5) at the center of the block on each of the two longest opposite sides. See Illustration 1.
Make sure that there is no gap between the block and the plate. See Illustration 2.
Illustration 3 g01943624
(1) Weld (2) Weld (3) Weld (4) Weld
Illustration 4 g01943628
Weld 30 mm (1.18 inch) beyond the edge of the block.
Illustration 5 g01943629
(6) Flare welds in order to avoid undercut at corners of the block.
Start weld (1) 5 mm (0.20 inch) to 10 mm (0.40 inch) away from the tack weld. Refer to Illustration 3 and Illustration 4. The weld should be a 7 mm (0.28 inch) fillet on the block. This tapers to a 3