TM 5-3990-264-13&P
0017
GENERAL WELDING MAINTENANCE
WARNING
CARC paint contains isocyanate (HDI) which is highly irritating to skin and respiratory system.
High concentrations of HDI can produce symptoms of itching and reddening of skin, a burning
sensation in throat and nose and watering of the eyes. In extreme concentrations, HDI can
cause cough, shortness of breath, pain during respiration, increased sputum production, and
chest tightness. The following precautions must be taken whenever using CARC paint:
ALWAYS use air line respirators when using CARC paint unless air sampling shows
exposure to be below standards. Use chemical cartridge respirator if air sampling is below
standards. Failure to comply may result in serious injury or death to personnel.
DO NOT use CARC paint without adequate ventilation. Failure to comply may result in
serious injury or death to personnel.
NEVER weld or cut CARC-coated materials. Failure to comply may result in serious injury
or death to personnel.
DO NOT grind or sand painted equipment without high-efficiency air purifying respirators
in use. Failure to comply may result in serious injury or death to personnel.
BE AWARE of CARC paint exposure symptoms; symptoms can occur a few days after
initial exposure. Seek medical help immediately if symptoms are detected. Failure to
comply may result in serious injury or death to personnel.
NOTE
When weldment cracks are discovered, it is recommended that they be repaired at the
next service interval to prevent the length of the crack from increasing and to minimize
repair. The following inspection procedures are to be considered as guidelines only. Any
cracks discovered during inspections considered more significant, especially from a
safety standpoint, should be referred to the supervisor for weld repair decisions. This
would include cracks identified in any main structural areas (A-Frame and main rail
flanges) and cracks that have opened and could lengthen rapidly during loading/
unloading operations.
Refer to TC 9-237 for welding theory and application.
Weldment Points
Thoroughly inspect all weldments for cracks, chips or other damage. Areas include the left and right locking tabs,
stanchion pockets, A-Frame interface, cross members, main rails, corner fittings, and the bail bar. Inspect welds for
acceptable crack length limits using the following guidelines.
1.
A-FRAME INTERFACE (Figure 1 Item 1). This area includes the A-Frame channel to main rail interface, the
inboard and outboard wrapper plates, and the front angle plates. Solid welds in this area are necessary to
ensure safe loading and unloading of the IBC. A crack should be repaired before it has reached 2 inches (5.08
cm). The combined length of multiple cracks at any one location should not exceed 4 inches (10.16 cm).
2.
BAIL BAR (Figure 1, Item 2). These welds are located at the base of the bail bar casting on the A-Frame of
the IBC. These welds secure the bail bar to the structure and are subjected to a significant portion of the total
load during loading and unloading operations. Cracks should be repaired prior to reaching 1 inch (2.54 cm) in
length. The combined length of multiple cracks at this location should not exceed 1 1/2 inches (3.81 cm).
0017-4
03/15/2011Rel(1.8)root(maintwp)wpno(M06000)
