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|  MIL-T-62518A
* 3.9.1 Welding. Adequate preparation of metal, prior to welding of the body and aerial tower
components, shall be provided. Surface of parts to be welded shall be free of rust, scale, paint,
grease and other foreign matter. Welding rods (electrodes) shall be compatible with the metal
being welded. All critical arc welds shall be magnaflux or dye penetrant inspected. The
following defects shall not be acceptable:
(a)
Slug or plug welding
(b)
Undersize of fillet welds, overlaps, inadequate fusion and penetration, undercutting of
weldments, and vertical down welding
(c)
Unremoved slag and spatter
(d)
Cracks
(e)
Spot, tack, or intermittent welds for strength.
Weld penetration shall be such as to provide transference of maximum design stress through the
base metal juncture. Intermittent welding shall be permissible when in accordance with 3.9.2
through 3.9.3.
3.9.2 Workmanship specimens. Workmanship specimens shall be prepared by the
manufacturer, for the body and aerial tower components, to simulate all welding conditions. The
specimens shall represent the minimum acceptable weld quality and cleaning procedure to be
used in production. Upon submittal of these specimens by the contractor, the quality level and
identification shall be subject to approval by the Government. The specimens shall be prepared
using the welding procedures to be employed in production. Specimens prepared to represent
multiple pass welds shall be made in such a manner as to leave at least two inches of each layer
of weld metal exposed. Approved specimens shall be retained at the contractor's plant.
3.9.3 Welding procedures. The welding procedure shall be recorded prior to production of
any weldment, but no procedure qualification other than workmanship specimens shall be
required.
3.9.4 Factors. The factors listed below which are applicable shall be included in the
recorded welding procedures:
(a)
Joint sketch
(b)
Joint type and preparation
(c)
Base metal type
(d)
Filler metal, size and type
(e)
Position of welding
(f)
Arc-voltage, current range and polarity
(g)
Manual or machine
(h)
Travel speed (machine only)
(i)
Pre-heat and post-heat.
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