AIA/NAS 991-2012 pdf download RESISTANCE SEAM AND ROLL SPOT WELDING EQUIPMENT 3 PHASE
Purpose
This specification provides a standard for the manufactureperformance，reliability,inspection,and procurement of aseries of standard resistance seam and roll spot weldingmachines. This standard lists minimum requirements and isnot to limit design advances.
Classification
The machines shall be of the following types, sizes andclasses.
Class
CircumferentialLongitudinalUniversal
Intended Use
The machines described by this specification are intendedfor use within the aerospace industry for efficiently producing optimum quality roll spot and seam welds on ferrousand non-ferrous alloys.
APPLICABLE SPECIFICATIONS，CODES，AND STANDARDS
The latest revision of the following specifications,codes,and standardsare included as a portion of this specification. Detail requirements ofthis specification shall override any contradictory portions of thefollowing specifications， codes，and standards.
American Welding Society (AWS) Standards
Resistance Welding Manufacturer’s Association (RWMA) Standards。(3.2)Electronic Industries Association (EIA) Standards for ElectronioComponents。(3.3.2)Wiring and
The Joint Industrial Council (JIC) Hydraulic and PneumaticStandards for Industrial Equipment(3.6)
National Electrical Manufacturer’s Association (NEMA) Standards。(35American Society of Mechanical Engineers (ASME) Boiler and PressureVessel Code，Section VIII。(3.10)
Military Specification MIL-W-6858 Welding Resistance: Aluminum,Magnesium，Non-Hardening Steels or Alloys，Nickel Alloys，HeatResisting Alloysand Titanium; Spot and Seam。(3.2) (4331)
National Aerospace Standard (NAS) 938，Machine Axis and MotionNomenclature.(3.3.2.5)
National Aerospace Standard 953，Numerical Control Systems(Reference 0nly)。(3.3.2.5)
National Aerospace Standard 955，Interchangeable Perforated TapeStandards Variable Block Format for Numerically Controlled Equipment(3.3.2.5)
National Electrical Code (NEC)。(3.5
Occupational Safety and Health Standards，Part 1910 of ChapterXVII of Title 29 of the Code of Federal Regulations。 Ref:Occupational Safety and Health Act (OSHA) – 1970。(3.8)State and Iocal Safety and Electrical Codes。(3.5) (3.8)2.13
REQUTREMENTS
3Design
The manufacturer has the choice of configuration and thefunctional operation of the machine,except where specificallystated in this specification.
AIA/NAS 991-2012 pdf download
PS:Thank you for your support!
