MIL-DTL-32505
6.3 Weldability. The Army Research Lab has conducted testing and found that Class I, AA7017 and
[To be determined Class II, AA7020] alloys can be welded and demonstrate good shock resistance
when tested with the method described in the Ground Combat Vehicle Welding Code, TACOM
Drawing 19207-12472301. However, 19207-12472301 does not currently address these alloys.
Appendix A provides the additional details to permit welding qualification for armor applications.
The fabricator performing welding on these alloys for armor applications is responsible for
developing and qualifying welding procedures in accordance with 19207-12472301. Appendix A
contains the supplemental information for the welding code. The thickness of the weldments
specified in the contract or drawing will determine the proofing projectile and striking velocity in
accordance with Appendix A. Tests have demonstrated that material covered by this specification
is weldable to itself and other weldable 7000, 5000, and 6000 series alloys using a 5000 series filler
metal. It is not weldable to 2000 series alloys by conventional welding techniques. Any deviations
from these conditions should be demonstrated prior to acceptance by the procuring activity.
6.4 Weld wire. Butt joints were successfully welded with AA5556 weld wire for Class I (AA7017)
when tested with the required proofing projectile per the Ground Combat Vehicle Welding Code
19207-12472301. For Class II (AA7020) flat weldments (butt joints) (to be determined) weld wire
was successfully used in welding the plates for proof testing (see 1.2).
6.5 Density. The density of AA7017 is 0.09971 lb/in3 (2.76 g/cm3). The density of AA7020 is
0.10043 lb/in3 (2.78 g/cm3).
6.6 Metric units. When metric divisions are required, units for inch, foot, foot-pounds, feet per
second, and pounds per square inch may be converted to the metric equivalent by multiplying them
by the following conversion factors:
English
Multiply by
Equals
Metric SI unit
inch
0.0254
=
meter (m)
foot
0.3048
=
meter (m)
pound
0.4536
=
kilogram (kg)
foot-lb
1.3558
=
joule (j)
feet/second
0.3048
=
meter per second (m/s)
pounds/sq. inch
0.00689
=
Mega Pascal (MPa)
gram (g) per cubic
pound/cubic inch
27.6799
=
centimeter (cm)
6.7 Subject term (key word) listing.
Ballistic testing
Caliber .30 AP M2
Caliber .50 AP M2
Caliber .50 FSP
M1114 HMMWV
Military vehicles
Stress corrosion
14.5-mm API
20-mm FSP
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