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|  MIL-B-53090(ME)
3.17.1 Identification marking. The Ml MCBS shall be identified in accordance with MIL-P-514,
type III, composition C or type III, grade A, class 1 material, (see table I, examination schedule). In
addition to the information required, the plate shall be marked with the following:
US
NSN 2590-01-230-8862
3.18 Welders and welding.
3.18.1 Welding. The surfaces of parts to be welded shall be free from rust, oxides, scale, paint,
grease, or other foreign matter. Weldment shall be of homogeneous appearance and form without
spattering or other irregularities, complying with the size, configuration, and other dimensional
requirements to develop the full strength of the parts joined by the welds. No cracks of any type are
permitted. Welds shall transmit stress without permanent deformation or failure when the parts connected
by the weld are subjected to proof and service loadings. All arc welding and welding procedures shall be in
accordance with ASME Boiler and Pressure Vessel Code Section IX, AWS D1.1 or AWS D1.2 as
appropriate, (see table I, examination schedule).
3.18.2 Welders. Before assigning any welder to welder or welding operator work covered by this
specification, the contractor shall obtain certification that the welder has passed qualification tests as
prescribed by one of the following listed codes for the materials joined and the type of welding operation to
be performed and that such qualification is effective as defined by the particular code:
AWS D1. 1 Structural Welding Code - Steel
AWS D1.2 Structural Welding Code - Aluminum
ASME Boiler and Pressure Vessel Code, Section IX, Welding and Brazing Qualifications.
Contractors who rake only horizontal welds need not to qualify welders for "all position welding". In the
event of evidence of poor welds, the Government reserves the right to require retesting of any welder or
welding operator. The test results shall be made available for review by the contracting officer or the
contracting officer's representative, (see table I, examination schedule).
3.19 Transportability. The Ml MCBS shall be capable of being transported by military or commercial
trailers, trains, vessels, aircraft and can withstand the impact forces encountered in shipment without
damage or permanent deformation. The mine clearing blade shall be equipped with tiedown, and slinging
provisions. The MCBS shall not be transported mounted on the Ml series main battle tank (i.e., it will
always be shipped dismounted).
3.19.1 Tiedown provisions. The tiedown provisions shall conform to MIL-STD-209, class 2 or 3,
type II equipment and to MIL-STD-1791 for equipment restraint criteria. The tiedown provisions shall
satisfactorily complete the pull testing as specified without weld failure, permanent deformation, cracking,
loosening, or breaking of the provision or its connecting structural components, (see table I, examination
schedule).
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