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Home > Ordnance Documents and other related manuals > > Heat Treated Parts.
Procedure - od165180020
Figure 4. Reinforcing Frame Members

Welding Operations, I
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WELDING OPERATIONS I - OD1651 - LESSON 1/TASK 1
Nonuniform  or  rapid  cooling  will  create  internal  stresses.
Welded engine blocks must be leak tested before placing them back
in operation.  Leak testing procedures are specified in TM 9-237.
(3) Heat Treated Parts.
(a) The  functions  performed  by  certain  parts  in  automotive
equipment  require  heat  treatment  during  their  manufacture.
Welding of these parts should not be attempted unless the repair
shop  is  equipped  with  suitable  heat  treating  equipment  for
handling these parts after welding.
(b) In some cases, alloy steels, or specially treated parts,
may be repaired by using a heat affected zone that is weaker than
the original heat treated part.  In general, where it is possible
to heat treat the parts after welding, they should be annealed
prior to welding them.
Filler metal of the same composition or
properties as the base metal should be used, and the parts heat
treated after welding.
(c) In cases where the part to be welded is in a heat treated
condition, a stainless steel filler rod and the transition bead
welding method may be used as described below:
1 Deposit a layer of stainless steel (25 percent chromium, 20
percent nickel, or modified 18 percent chromium, 8 percent nickel
stainless steel rod) on the surfaces of the broken edges.
2 Weld the prepared edges with mild steel or high strength
filler metal.
Use 11 to 14 percent manganese or high strength
filler metal on the stainless steel layer instead of mild steel
where hardness and toughness are required.  The weld then may be
covered with a layer of hard surfacing metal.
(d) These methods are useful in the field, but should be used
under emergency conditions only.
(4) Wheel Vehicle Components.
(a) Frames.  The repair of frames by welding is not authorized.
Crossmembers  and  horns  for  the  frame  may  be  straightened,
repaired, and reinforced.
A commonly used method of repairing
and strengthening a broken or weakened crossmember or horn is
performed by using reinforcing plates as
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