Accession Number:

AD0002593

Title:

Test of 3 in/50 AA Projectiles with Copper Welded-Overlay Rotating Bands

Descriptive Note:

Final rept.

Corporate Author:

NAVAL WEAPONS LAB DAHLGREN VA

Personal Author(s):

• Rischall, H.

Report Date:

1953-02-01

Pagination or Media Count:

44.0

Abstract:

Tests were conducted to compare the metallurgical and physical properties and the ballistic performances of the 3-in.50-cal Mk 33 Mod O AA projectiles with Cu welded-overlay bands I and standard Mk 33 Mod O projectiles II. At proof or service pressure, I had better band engraving upon firing from a new gun however, in a worn gun at service pressure, II showed slightly better band engraving. Both bands failed at proof pressure in a worn gun. The cavity deformation under the band was greater for I. Hard globules of steel in the Cu of I came from the 4.5 to 8.5 Fe which the bands picked up from the projectile during welding. These hard spots would increase gun wear. Range firing results of I and II were about equal. Bore and flight-safety tests on I fired from new and old guns were satisfactory.

Descriptors:

• *EXTERIOR BALLISTICS
• *ANTIAIRCRAFT AMMUNITION
• *ROTATING BANDS
• FIRING TESTS(ORDNANCE)
• DEFORMATION
• SPHERES
• STEEL
• WEAR
• PRESSURE
• AVIATION SAFETY
• RANGES(FACILITIES)
• WELDING
• METALLURGY

Subject Categories:

• Ammunition and Explosives

Distribution Statement:

APPROVED FOR PUBLIC RELEASE