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|  MIL-T-62110G
and metal handling marks, rust, scale, and cracks. All metal and plastic materials used shall be
free from delamination defects, and shall be prime material. Defective components or parts and
assemblies which have been modified to overcome deficiencies shall not be furnished.
3.21.1 Welding. Adequate preparation of metal prior to welding of the body, turret,
digger, and components shall be provided. The surface of parts to be welded shall be free of
rust, scale, paint, grease, and other foreign matter. Welding rods 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) Welds which are ground flush with metal
(b) Slug or plug welding on load bearing members
(c) Undersize fillet welds, overlaps, inadequate fusion and penetration, undercutting of
weldments and vertical down welding
(d) Unremoved slag and spatter
(e) Cracks
(f) 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 3.22.3
and 3.22.4.
3.21.2 Workmanship specimens. Workmanship specimens shall be prepared by the
manufacturer of the subframe and derrick 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 2 inches of each layer of
weld metal exposed. Approval specimens shall be retained at the contractor's plant.
3.21.3 Welding procedure. The welding procedure shall be recorded prior to production
of any weldment, but no procedure qualification other than workmanship specimens shall be
required.
3.21.4 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
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