AIA/NAS 976-2012 pdf download ELECTRON BEAM WELDING MACHINE – HIGH VACUUM
1. 0 SCOPE
1. 1 Purpose This specification provides a standard for manufacture, performance, inspection, reliability and procurement of an Electron Beam high-vacuum welding system exclusive of weld positioners, weld manipulators and other mechani- cal tooling devices. This standard lists minimum require- ments and is not limited to design advancements.
Classification
This machine is a completely self-contained generalpurpose Electron Beam welding facility.
Electron Beam – High Vacuum
Movable Gun
Fixed Gun
Movable Gun and Workpiece
Size
Chamber size and power ratings shall be that which is applicable to customer requirements.
Class
Precision
aISE
The welding systems described by this specification areintended for use in the aerospace manufacturing industryand provides a means for joining together a wide rangeof materials and material thickness. These include,butare not limited to, refractory and reactive metals,ceramics，dissimilar materials，steels,and non-ferrousmetal alloys.
APPLICABLE SPECIFICATIONS，CODES AND STANDARDS
The latest revision of the following specifications, codes, andDetailstandards are included as a portion of this specification.requirements listed in this specification shall override any contra-dictory portions of the following specifications, codes, and standards.
The National Electrical Manufacturers Association (IEMAStandards for Electrical Apparatus and Equipment.(3.5)
The Electronic Industries Association (EIA) ConstructionStandards，RS281.
National Aerospace Standard 938，Machine Axis and MotionNomenclature，as applicable.
National Aerospace Standard 953，Numerical ControlSystem (standard practice),as applicable.
National Aerospace Standard 955，Interchangeable Perfo-rated Tape Standards,Variable Block Format，NumericallyControlled Equipment, as applicable.
National Aerospace Standard 968，Interchangeable DigitalMagnetic Tape Standards ， Variable Block，Word AddressFormat,Contouring and Contouring/Positioning Equipment,as applicable.
National Aerospace Standard 969，Interchangeable DigitalMagnetic Tape Cartridge – for Numerically ControlledMachines，as applicable.
MIL-C-45662，Calibration of Standards
Glossary of Manufacturing Equipment Terms，NAS 972.(8.1)
Occupational Safety 占 Health Standard Part 1910 of ChapterXVII of Title 29 of the Code of Federal Regulations(Occupational Safety Health Act (OSHA) – 1970)。(3.8).
Design
The general shape and arrangement of the Electron Beamwelding machine,control cabinets and associated componentsshall provide the necessary functions with accessibility,minimum space and neatness.The manufacturer has thechoice of configuration and the functional operation of themachine,except where specifically stated in this specification.
Size
The vacuum chamber configuration and size shall be indicatedby the manufacturer. The usable working area shall bespecified by the customer.
Machine Sub-Assemblies
Positioning Mechanism
When the gun and/or the workpiece are movable for the pur-pose of positioning and welding, the positioning mechanismsshall be controlled from outside the chamber. These controlsshall bemounted in a location easily accessible to theoperator while observing the welding
When a movable gun is specified it shall provide sufficientcable and accessory for using the gun in a 90° tilt about theaxis of travel up to the horizontal position. This adjustmentshall be applicable over the entire span of travel.
Positioning mechanism for gun or workpiece shall be zerobacklash type and shall be capable of manual or mechanizedmovement for alignment of beam center line to weld position.
AIA/NAS 976-2012 pdf download
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