This task covers:
b. Nondestructive Testing
TM 9-237, MIL-STD-410, MIL-I-6870, MIL-STD-6866
Welding and brazing operations produce heat, toxic fumes, radiation, metal slag,
and carbon particles. Welding and brazing goggles with properly tinted lenses are
required. Also, gloves, apron, and welding boots are required or injury to
personnel may result.
Welding and brazing processes may be used to repair cracks in steel parts such as brackets, panels, and light framework;
however, the time required, the difficulty of working with the metal, and the chance of embrittlement and subsequent
failure make such repairs of questionable value. Hence, welding and brazing should only be attempted when replacement
parts are not available. Since the semitrailer is designed to carry greatly concentrated loads, most of the structure
requires specialized welding procedures. Any personnel performing repair welding on the semitrailer must be properly
trained and certified to conduct all phases of the welding procedure. After any welding, an inspection must be conducted.
Fluorescent penetrant may cause injury to personnel. Avoid skin contact. In case
of skin contact, wash with warm water and soap.
Fluorescent penetrant inspection. A fluorescent penetrant inspection must be performed on metallic components
which have been welded. After fluorescent penetrant has been applied and a pattern has developed, any
evidence of cracks is cause for rejection. This inspection should be performed on parts as prescribed in MIL-I-
6870 by operators and inspectors certified in accordance with MIL-STD-410, with equipment according to MIL-