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Section III. SUPERSTRUCTURE REPAIR
Up
TM-5-5420-205-14 Superstructure Interior Bay Mobile Floating Assault Bridge/Ferry NSN
Next
Refinishing and Repainting cont'd
TM 5-5420-205-14
(Short End Section) Cont'd
Curb crank arms
Steel-ASTM A237, CL.B
Yes
AWS-ASTM
E7000 Series
Male and female end connectors
Steel-ASTM-A441
Yes
AWS-ASTM
E7000 Series
Rotation spline assembly
Steel-ASTM A441
Yes
AWS-ASTM
E7000 Series
c.  Structural bolt replacement should be made with the
b. The aluminum structural riveting used on both
same size and grade of bolts as are used in the original
sections of the end-bay superstructure is of 7277-T4
fabrication. That is, bolt heads with three radial markings
aluminum alloy. These are large 3/4-inch diameter rivets
are Grade 5, and those with six radial markings are of
which are hot-driven. Field replacement of these rivets by
Grade 8 high-strength alloy steel.
repair rivets is, therefore, not recommended. Rivets which
have failed should be replaced by Grade 8, cadmium
6-9.  Interior
Bay
Superstructure
Structural
plated steel bolts, This grade and size of bolts should be
Description
torqued to about 275 foot-pounds to assure structural
The interior bay superstructure is fabricated from the
integrity.
materials listed in Table 6-2 below:
Table 6-2. Interior Bay Superstructure Materials
Welding
Recommended
Item description
Material and alloy
repair
weld filler
recommended
material
Girders
Steel-ASTM A441
Yes
AWS or ASTM
E7000 Series
Male and female end connectors
Steel-ASTM A441
Yes
AWS or ASTM
E7000 Series
Curbs
Steel A441
Yes
AWS or ASTM
E7000 Series
Curb support strut arms
Steel (Ends-ASTM-A441)
Yes
AWS or ASTM
E7000 Series
Curb crank arms
Yes
AWS or ASTM
E7000 Series
Rotation spline assembly
Yes
AWS or ASTM
E7000 Series
welds are highly stressed during MAB bridging and ferrying
6-10. Steel Repair of Superstructures by Welding
operations.
The structural steel used in the superstructure is high-
6-11. Aluminum Repair of Superstructures by Welding
strength low alloy structural steel with a tensile strength of
70,000 psi. Covered low alloy steel arc-welding electrodes
The only aluminum areas of the superstructures, for which
recommended for satisfactory weld repairs are identified as
repairs by welding are recommended, are in the nose
AWS or ASTM E7000 series.  These electrodes are
structure of the tapered section of the end-bay. Refer to
identified in the military number series as "MIL-7000".
the tabulation under "End-Bay Superstructure Structural
These electrodes are manufactured with various covering
Description" for the Alloy identifications and recommended
materials for varying welding positions, and for AC and DC
weld filler materials. Good welding techniques, if utilized in
straight and reverse polarities. To protect against severe
this area, can produce structural repair equivalence if the
weakening of the weld due to hydrogen effects, it is
weld size, penetration, fusion, and absence of porosity are
necessary to assure that the electrode coverings have not
controlled.
absorbed excess moisture during their storage.  Consult
6-12. Refinishing and Repainting
the applicable procedures for the specified welding
a. The MAB transporter superstructure
equipment and material being used.  The repair weld
equipment are painted in accordance with Military
soundness should be verified as the
Specification MIL-T-704., Type B, which uses
6-8

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