HOSE AS 1734870 - Caterpillar

TENSILE STRENGTH 480 MPa (70 KSI)
YIELD STRENGTH 400 MPa (58 KSI)
ELONGATION 22%
IMPACT TOUGHNESS 20 FT LBF @-20F (27J@-18C)Welding parameters will vary due to weldposition and manufacturer of the welding electrode. For 1.3mm (0.052 inch)diameter electrode typical welding parameters should be:
WIRE FEED SPEED VOLTAGE APPROX. AMPERAGE
MIN 200 IMP 24 210
275 IMP 28 250
MAX 325 IPM 29 300Use the direct current electrode positive(DC reverse polarity) setting and remove the slag after every pass.As an alternative process, the SMAW processshall be used with E7018 (ANSI/AWS A5.1) welding electrode. The weld depositedby these electrodes will have the following minimum mechanical properties:
TENSILE STRENGTH 480 MPa (70 KSI)
YIELD STRENGTH 400 MPa (58 KSI)
ELONGATION 22%
IMPACT TOUGHNESS 20 FT LBF @-20F (27J@-18C)These are low hydrogen electrodes and mustbe stored in an electrode oven at 120 degrees C (250 degrees F) when notin use. If the electrodes get damp, scrap or recondition to manufacturer'sspecifications. The following chart relates to the electrode diameter andapproximate current settings for welding:
DIAMETER AMPS
3.2MM (0.125") 1/8" 70-140
4.0MM (0.156") 5/32" 110-180
4.8MM (0.166") 3/16" 190-270Use the direct current electrode positive(DC reverse polarity) polarity setting and remove the slag after everypass. The weld pass shall not exceed two times the electrode diameter.b. Precaution/Pre-cleaning - Clean the areato be welded of oil, grease, paint, and dirt. Attach the welding groundcable directly to the frame assembly. Protect all machined surfaces fromsparks or spatter produced by the welding, chipping, and/or grinding operations.c. Quality/Inspection - The weld shall be freefrom cracks, porosity, undercut, and incomplete fusion. All weld qualityshall conform to ANSI/AWS 14.3. Illustration 2 - View of typical tail castingcrack3. Begin removing crack with the carbon arcgouging method, or grinding. Continue to excavate until the crack is nolong visible to the naked eye. Excavate two inches beyond each end of thecrack and taper.Note: Use 1/4" to 3/8" arc air electrode,and follow manufacturer?s spec for proper machine and air pressure settings.4. Thoroughly clean the area using a soft padgrinder and a solvent dampened cloth. Do not spray solvent/cleaner directlyonto the surface of the repair, as it will fill the crack instead of thedye penetrant.5. Perform dye penetrant inspection to againdetect the crack, which is no longer visible to the naked eye.6. Excavate the crack in the area indicatedby the dye penetrant inspection. Continue to excavate until the crack isagain no long visible to the naked eye. Excavate two inches beyond eachof the crack and taper.7. Repeat Steps 4 through 6 until crack iscompletely removed. Complete crack removal must be verified using dye penetrantinspection.
Note: Mag particle inspection may be usedto define the initial crack. However, once the initial crack has been excavated,it is necessary to use dye penetrant to detect further cracking. Often,the initial crack excavation may be too wide to accommodate the magnetand/or subsequent cracks that run traverse to the first crack may be missedusing mag particle. Dye penetrant will "fan out" and aid in detecting othermulti-directional cracks that may be missed by improper placement of themag particle magnet.Note: Often the majority of the crack willbe subsurface. Illustration 2 shows a tail casting crack prior to repair.Illustration 3 shows the same casting as the crack was excavated. Removingthe entire crack