MIL-HDBK-1890(AT)
4.4.2 Resistance (RW) welds. Welds resulting from these processes should conform to the following:
a. The centerline of the material overlap should be the centerline of the spot or seam weld.
b. The spot and seam welds should be aligned within 0.060 in. of the centerline.
c. Seam welds should terminate within 0.120 in. of the ends of the weld run. d. The surface imperfections of welds should be in accordance with the limits stated in table V.
e. There should be no evidence of arc or oxyfuel gas weld methods in association with resistance welding.
f. Cracks, porosity and voids, metal expulsion between sheets and surface flashes should be in accordance with the limits stated in table VI (see also
MIL-W-6858).
g. When the nugget size is not specified in the engineering drawing, the minimum nugget size should be in accordance with MIL-W-6858.
h. A maximum of 5 gap areas between indentations circumferential weld joints should be permitted provided no individual gap exceeds 0.060 in. and
the cumulative total of all gaps per joint does not exceed 0.250 in.
4.5 Rejection. Parts containing discontinuities or defects exceeding the permissible limits of the applicable specification, drawing, standard, or directive should be separated from the acceptable material, appropriately identified as discrepant, and submitted for review as may be provided in the contract. Weld rework which will restore weld areas to meet all engineering drawing requirements should only be done with concurrence of the acquisition. Care should be exercised to insure that the parent metal is not removed during the rework operations. All weld rework should be inspected in accordance with the applicable guidelines of 4.2.
4.6 Marking. Parts which conform satisfactorily to applicable inspection requirements should be marked in a manner and location harmless to the part that will preclude removal, smearing, or obliteration by subsequent handling. When processing which would remove identification is planned, the applicable symbol should be affixed to the records accompanying the parts. Impression stamping should be used where permitted. When applicable parts should be marked by etching, suitable etchants and application methods should be employed. Etching methods other than fluid etching may be used. Where etching or impression stamping is not appropriate, identification may be accomplished by dying. Other means of identification such as tagging may be applied to completely ground and polished parts for which construction, finish or functional requirement preclude the use of etching, stamping, or dyeing.
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