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Home > Ordnance Documents and other related manuals > > Determining the Welding Method
Automotive Welding Processes, Materials, and Identification
Figure 3. Preparing Engine Block For Welding.

Welding Operations, I
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WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
rods, pistons, valves, and cams are considered unsuitable for
field welding.  The principal reason for this is that these parts
have been previously heat treated to create desirable performance
characteristics (hardness or toughness); welding heat alters or
destroys these characteristics.
c.  Determining the Welding Method.  Automotive equipment such as
trucks,
tanks,
truck-tractors,
and
other
vehicles,
are
constructed from a large variety of metals that are heat treated
under various processes.
The metals used include copper alloys
of various types, carbon and alloy steels, titanium, aluminum,
magnesium, lead, among others.
The principal joining processes
that may be used are oxyacetylene, arc welding, brazing, and
soldering.
Oxyacetylene welding is used for welding of thin
metals and brazing of cast iron parts on automotive equipment,
while soldering is used for repairing such parts as fuel tanks,
radiators,  and  electrical  connections.
This  lesson,  however,
concentrates  on  the  arc  welding  processes  for  repair  of
automotive  equipment.
For  further  information  pertaining  to
oxyacetylene gas welding and soldering, refer to TM 9-237.
The
following subparagraphs describe weldable automotive parts and
the methods of repair.
This listing is an extract.
A more
complete list of repairable parts can be found in Tables B-2 and
B-3 of TM 9-237.
(1) Cast  Iron,  Cast  Steel,  Carbon  Steel,  and  Forgings.
Generally, parts composed of these metals can be repaired by the
same procedure as that used for their assembly or by brazing or
soldering  if  the  joining  equipment  originally  used  is  not
available or suitable for the purpose.
For example, cast iron
and cast steel may be repaired by gas welding, arc welding, or by
brazing.
Parts  or  sections  made  of  carbon  steel  originally
assembled by spot, projection, or flash welding may be repaired
by gas or arc welding.  This same procedure is true of forgings.
(2) Cast Iron Engine Blocks (figure 3, on the following page).
(a) General.
Engine  blocks  may  be  repaired  by  welding  or
brazing in the field only under extreme emergency conditions and
if a replacement block is not available.
Welding or brazing of
engine blocks is limited to those areas described below:
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