5-6. GENERAL WELDING MAINTENANCE.
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 stand
point, 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.
Weldment Points. Thoroughly inspect all weldments for cracks, chips or other damage. Areas include the
front and rear ISO locks, flatrack floor joints and wall, tiedown rings and the hookbar. Inspect welds for
acceptable crack length limits using the following guidelines.
A-Frame Interface (1). This area includes the A-Frame channel to main rail interface, the top and
outboard wrapper plates, and the front wrapper plate and gussets. Solid welds in this area are necessary
to ensure safe loading and unloading of the flatrack. A crack should be repaired before it has reached
two in. (5 cm). The combined length of multiple cracks at any one location should not exceed four in.
Hookbar (2). These welds are located at the base of the hookbar casting on the A-Frame of the flatrack.
These welds secure the hookbar 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 one inch (2 cm) in
length. The combined length of multiple cracks at this location should not exceed 1 1/2 in. (4 cm).
Corner Fitting and Adjacent Structure (3). The corner fittings of the flatrack are used for transportation.
They may be used to secure the flatrack to a trailer, container or another flatrack. Due to the high loads
that these fittings can see in a transport mode, the crack should be repaired before reaching 1/2 inch
(1 cm) in length. The combined length of multiple cracks at any one location should not exceed 1/2 inch
(1 cm). This applies to cracks present in the adjoining structure also.