Section 000-0010
SM 2172 10-02
1
Welding
WARNINGS
Before any welding is done on a machine
equipped with any electronic systems,
disconnect the following (if applicable) in this
order: Battery earth cable, battery supply
cable, alternator earth cables, alternator supply
cables and electrical connections at the engine
ECM, transmission ECU, body control lever,
hydraulics ECU and cab bulkhead to avoid
damage to electrical components. Turn off
battery master switch to isolate the batteries
before disconnecting any components.
After welding connect all of the above in the
reverse order.
Before any welding is done ensure all paint has
been removed from the area to be welded.
Failure to do so may result in hazardous fumes
being given off from the paint.
Note:
Always fasten the welding machines ground
cable to the piece/frame being welded if possible.
Electric arc welding is recommended for all welded
frame repairs. Since the nature and extent of damage
to the frame cannot be predetermined, no definite
repair procedure can be established. As a general rule
however, if parts are twisted, bent or pulled apart, or a
frame is bent or out of alignment, no welding should be
done until the parts are straightened or realigned.
Successfully welded repairs will depend to a great
extent upon the use of the proper equipment, materials
and the ability of the welder. The Customer Support
Department can be consulted regarding the feasibility
of welding repairs.
WARNING
Welding and flame cutting cadmium plated
metals produce odourless fumes which are
toxic. Recommended industrial hygiene
practice for protection of the welding operator
from the cadmium fumes and metallic oxides
requires enclosure ventilation specifically
designed for the welding process. A
respiratory protective device such as the
M.S.A. 'Gasfoe' respirator with G.M.A. cartridge
will provide protection against cadmium,
fumes and metallic oxides. The 'Gasfoe'
respirator has been approved by the U.S.
Bureau of Mines: Approval number 23B-10,
and is designed to protect against gases,
vapours, and/or metal fumes.
Note:
The current from the welding rod always follows
the path of least resistance. If, for example, the ground
clamp is attached to the rear frame when welding is
performed on the front frame, the current must pass a
frame connection to return to the welding machine.
Since the pivot coupling offers the least resistance but
not a sound electrical connection, small electric arcs
may be set up across the moving parts which may
cause welding blotches on their wearing surfaces and
increase the wear rate of these components.
General Welding Procedure
The following general procedure should be used for
the repair of defects outwith the vicinity of alloy steel
castings.
1. Completely ARC-AIR gouge or grind out the crack
until sound metal is reached. If ARC-AIR method is
employed, pre-heat area to 100° C (212° F), measure
3 - 4" either side of repair prior to gouging. On
completion of gouging grind to remove thin carbon
layer.
2. Apply dye-penetrant check to ensure crack has
been completely removed.
GENERAL INFORMATION - Welding Procedure
Содержание TA30
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