WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
operation of components.
All protrusions should be ground down
flush before reinforcing plates are applied.
Reinforcement
plates should be approximately the same thickness as the frame
section and the width sufficient to bring the weld flush with the
top and bottom sections of the channel. It should be noted that
the welded ends of the plates produce heat affected areas of
decreased strength across the back and legs of the channel.
(b) Front Axles.
Front axles are made of heat treated alloy
drop forgings.
Repairs by welding should not be made on these
axles except as a temporary measure under extreme emergency
conditions.
(c) Rear Axle Housings.
These components are made of welded
pressed steel or malleable cast iron or cast steel. The pressed
steel and cast steel housings can be arc welded.
The malleable
iron housings should be repaired by brazing; although, they can
be welded if extreme precautions are maintained. Castings should
be kept clean in the vicinity of the weld.
(d) Drive Shafts.
Drive shafts are usually made of medium
carbon steel seamless tubing and are readily weldable by either
arc or gas welding.
(e) Machined Alloy Steel Parts.
These type parts such as
crankshafts, connecting rods, gears, and axle drive shafts are
not generally repaired by welding because the heat of welding
will impair the metal qualities produced by previous heat
treatment.
(f) Radiators. Radiators can be repaired with an oxyacetylene
welding torch containing a proper tip, common 50-50 solder, and
flux. The oxyacetylene flame should be adjusted to give a slight
carburizing mixture.
The areas around the leaks in the copper
tubes should be thoroughly cleaned, preferably with a 5 percent
solution of hydrochloric acid, and tinned before the joint is
made in order to ensure a tight joint. For leaks between copper
and cast iron, the surface of the iron should be pickled before
the repair is made. Pickling the surface of the iron is done by
applying a 5 percent hydrochloric acid solution to it at the
joint and heating it until thoroughly cleaned.
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