au. Truck Sides, Pressed- or Structural-Steel.
Latitudinal running boards-welding of
No welding permitted.
cracks and fractures permitted up to 50 percent of
sectional area of complete section.
av. Uncoupling Levers
. No welding
Running Boards, Aluminum. No welding of
cracks or fractures permitted.
aw. Wedges, Journal Bearing. AAR standard
drop-forged or cast-steel wedges removed from service
ak. Running Boards, Steel (Tank Cars Only).
because they have reached the limit of wear may be
Only welding of cracks or fractures in running board
reclaimed by reforging or fusion welding and restored to
sections permitted, except to restore original
Wedges thus reclaimed will be
construction weld or if over running board support.
classified as new. Journal bearing wedges may also be
Welding in connection with splicing of running board
reclaimed by machining or grinding provided-
sections over body bolsters, center sills, and cross
supports for purpose of renewing sections at these
Original top contour of wedge is
formed to 50-inch radius.
Sheets, Body or Roof. No restrictions.
Nominal thickness of crown is not
reduced more than 3/32 inch.
am. Sill Steps and Their Supports. No welding
Lengths over contract surfaces are
restored to nominal dimensions if reduced more than
Shaft, Brake. No welding permitted.
1/16 inch. Wedges thus reclaimed will be classified as
Stakes. No restrictions.
Spring, Planks. No restrictions except that,
ax. Wheels, Brake.
No welding of cracks or
where thickness is reduced to less than 1/4 inch owing
to corrosion, spring planks must not be welded. Spring
plank must be removed for welding.
aq. Tanks of Tank Cars. Welding of any kind is
not permitted on tanks of tank cars unless the shop
performing such welding is certified by the AAR. For
20-6. Welding Regulations for Couplers and Cast
welding repairs to tanks of riveted or welded
construction, all applicable requirements of currently
effective DOT Regulations for Transportation of
Explosives and other Dangerous Articles, and Appendix
Welding is permitted for couplers and cast steel yokes
R, AAR Specifications for Tank Cars must be fully
under the following regulations:
complied with before cars are restored to service.
Welding practices permitted under these
ar. Top Chord Angles of Open-Top Cars. No
regulations are confined to couplers and yokes made of
grade B carbon steel. The work must be done only
as. Transom Truck (the Crossmember of Each
under expert supervision and only at reclamation plants
Side of Bolsters Which Tires the Side Frames Together).
where facilities such as heat treating furnaces using
May be welded in place by removing truck from
pyrometers (preferably recording pyrometers) and other
underneath the car body.
essential safeguards are provided, so that quality and
uniformity of results may be assured. All existing rules
Truck Sides, Cast Steel. Building up worn
and restrictions with respect to welding of couplers and
surfaces and welding cracks within certain areas or
yokes remain in full force except as herein modified.
welding performed on other parts extending from frame
members, such as tie strap lugs on Andrews type side
Cracks In couplers and cast steel yokes are
frames, where the weld is over 1 inch from the frame
welded by the electric process, using a shielded arc
member, is permissible on side frames of U-section
design manufactured (as indicated by foundry marks) in
Cracks in couplers must be prepared for
1926 or before. The material remaining in the part to be
built up must be equal to 60 percent of the original
that the welding can all be done from the outside.
section, or the area of the crack must be less than 40
percent of the total area through the section at the point
Cracks in yokes, if both sides of the
fractured member can be worked upon, should be
prohibited. Brake hanger bracket repairs or renewals
may be performed, however, as outlined in z above.
done from both sides. If only one side can be worked