© 2022 Genesis Attachments, LLC
Genesis GHG 16 - GHG 50 Handling Grapple
26
Build-up and hard-surfacing are welding procedures that protect the parent material of the arms
and keep the tool in good condition. Build-up is the welding procedure that restores the arms to
their original shape and increases the life of the attachment. Hard-surfacing is the welding material
added over the parent material (or build-up material) to create a wear-resistant surface.
Welding should not be performed until the arms are work-hardened. Work-hardening can take up
to 80 hours.
Welding Ground Clamp
Disconnect all battery ground cables or shut off master battery switch, if equipped. Failure
to do so may cause excavator electrical problems, including permanent damage to on
-
board computer systems.
Connect ground clamp as close as possible to the area being welded without allowing cur
-
rent to pass through the pivot pins, cylinder pin, cylinder, swivel, motor or slewing ring.
If you are welding on the frame, connect weld clamp to the frame. If you are welding on the
arms, connect to the arms but not to the cylinder clevis. If needed, weld a piece of steel to
the area for the grounding clamp and cut the piece off when welding is completed.
Welding Rules
Before you begin:
• Wearing an approved respirator, grind the area to clean it and remove all existing hard-
surfacing.
•
Preheat area to 350˚ F (177˚ C). Maintain this temperature throughout the procedure. Do
not exceed 450˚ F interpass temperature.
During welding:
• Always grind and weld with the grain of the material.
• Peen each weld pass to relieve stress and harden the welds.
• Do not undercut the ends of the welds.
After welding maintenance is complete:
• Cover the area with a heat blanket and allow it to cool slowly, approximately eight hours.
• Do not put the attachment into operation until the welds have been allowed to cool.
GENERAL WELDING GUIDELINES
