MIL-T-62110 Trucks, Maintenance: With Rotating Hydraulic Derrick, 32,000 To 44,500 Gvw, 4X2, 4X4, 6X4, And 6X6, CommercialThis specification covers maintenance trucks with a rotating and telescoping hydraulic derrick. Vehicles procured under this specification are commercial items which are warranted by the manufacturer as specified in acquisition documents.

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MIL-T-6211OG

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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