Accession Number : AD0901523

Title :   Laser Welding Precision Miniature Assemblies.

Descriptive Note : Final technical rept. 1 Jun 71-29 Feb 72,

Corporate Author : GRUMMAN AEROSPACE CORP BETHPAGE NY

Personal Author(s) : Kloepper, David

Report Date : MAR 1972

Pagination or Media Count : 63

Abstract : The program objective was to demonstrate laser welding capabilities by fabricating precision miniature null-point calorimeter slugs to be used and/or evaluated by the Air Force Materials Laboratory in calibration of the Air Force Flight Dynamics Laboratory's 50-megawatt arc-jet test facility. The state-of-the-art of null-point calorimeter fabrication and laser welding is reviewed. Parameters for welding 0.0005- to 0.002-in.-thick chromel-alumel thermocouple wires to thin copper sheets were optimized using appropriate fixturing. 1/16-in.-diameter OFHC copper slugs were drilled with 0.012-in.-diameter flatbottom holes to extreme tolerances. Ultraminiature sheathed thermocouple assemblies with 0.0008-in.-diameter wires were laser welded to the interior of the slug cavity by a melt-through technique. Eight finished calorimeter slugs were delivered to AFML. Advantages of the process include ease of fabrication, strength and reliability of joint, and cost savings. (Author)

Descriptors :   *LASERS), (*WELDING, CALORIMETERS, THERMOCOUPLES, COPPER, SHEETS, WIRE, NICKEL ALLOYS, CHROMIUM ALLOYS, ALUMINUM ALLOYS, MANGANESE ALLOYS, SILICON, PRECISION FINISHING, MINIATURE ELECTRICAL EQUIPMENT.

Subject Categories : Lasers and Masers
      Fabrication Metallurgy
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE