Dye penetrant examination.

TM 5-5420-279-23

(d)

Inspection: Apply to the repaired weld the same inspection requirements as

the original weld.

(10) Unacceptable welds: The entire length of all welds is to be visually examined and to

be free from the following defects:

(a)

Cracks - crater, transverse, longitudinal, edge.

(b)

Insufficient weld size, (i.e., below 1/32 in (0.79mm) below nominal size

quoted)

(c)

Continuous/local undercut in a length of weld in excess of 10% of parent metal

thickness.

(d)

Reinforcement in excess of 40% of the specified profile.

(e)

Incomplete penetration of butt welds made from one side.

(f)

The depth of any root concavity or shrinkage groove in butt welds shall not

exceed 1/4 in (6.35mm) but at no point should the weld be thinner than the parent

metal thickness.

(g)

Burn through (or melt through).

Dye penetrant examination.

Before starting the dye penetrant examination the surface to be inspected must be absolutely

clean. Contaminants may be removed by the use of a solvent (Section 4 Table 4-1, Item 7) or

wire brushing. The following procedures then apply:

(1)

Application of dye penetrant:

WARNING

DANGEROUS CHEMICALS. AVOID CONTACT WITH SKIN AND EYES. DO NOT

INHALE AND USE ONLY IN CONDITIONS OF ADEQUATE VENTILATION.

PROTECTIVE CLOTHING, INCLUDING IMPERVIOUS GLOVES AND EYESHIELDS

SHOULD BE WORN. PENETRANT IS EXTREMELY FLAMMABLE. NO SMOKING,

NAKED FLAMES OR SPARKS ARE TO BE PERMITTED. IN CASE OF SKIN

CONTACT WASH THOROUGHLY WITH SOAP AND WATER, FOR EYE CONTACT

RINSE THOROUGHLY WITH CLEAN WATER AND SEEK MEDICAL ADVICE.

(a)

Apply a coat of penetrant (Section 4 Table 4-1, Item 16) by brush or spraying

onto the surface to be checked.

NOTE

Ensure that the component temperature is between 0oC and 40oC (32oF and 104oF).

(b)

Allow a contact time of 10-30 minutes after penetrant application.

(2)

Removal of dye penetrant: Remove excess surface penetrant by applying water from

a low pressure hand spray gun and rubbing with lint free cloth.

Appendix K Page 16