Laser Welding Precision Miniature Assemblies.
Final technical rept. 1 Jun 71-29 Feb 72,
GRUMMAN AEROSPACE CORP BETHPAGE NY
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The program objective was to demonstrate laser welding capabilities by fabricating precision miniature null-point calorimeter slugs to be used andor evaluated by the Air Force Materials Laboratory in calibration of the Air Force Flight Dynamics Laboratorys 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. 116-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
- Lasers and Masers
- Fabrication Metallurgy
- Test Facilities, Equipment and Methods