Laser Welding Precision Miniature Assemblies.

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Abstract:

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

Author(s):
Kloepper, David
Author Organization(s):
GRUMMAN AEROSPACE CORP BETHPAGE NY
Descriptive Note:
Final technical rept. 1 Jun 71-29 Feb 72,
Pagination:
0063

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
AFML-TR-72-49
Contract/Grant Number(s):
F33615-71-C-1554
Project Number(s):
AF-835-1
Monitor Series:
TR-72-49
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
*LASERS), (*WELDING, CALORIMETERS, THERMOCOUPLES, COPPER, SHEETS, WIRE, NICKEL ALLOYS, CHROMIUM ALLOYS, ALUMINUM ALLOYS, MANGANESE ALLOYS, SILICON, PRECISION FINISHING, MINIATURE ELECTRICAL EQUIPMENT
Field(s)/Group(s):
Lasers and Masers, Fabrication Metallurgy, Test Facilities, Equipment and Methods
Keyword(s):
COPPER ALLOY OFHC, *LASER WELDING, NICKEL ALLOY ALUMEL CHROMEL, NULL POINT CALORIMETERS, SLUG WELDING
Report Date:
1972 Mar 01