AWS C7.4-C7.4M:2017 pdf download.Process Specification and Operator Qualification for Laser Beam Welding
This specification covers the preparation, the process control, and quality control requirements for laser beam welding. Welding equipment includes Gas Lasers (CO,) and Solid-State Lasers (Nd:YAG. Yh:YAG, Nd:Glass, Diode.
Ruby. Disk and Fiber) in pulsed, continuous wave (CW), and quasi-continuous wave (QCW) output as defined in AWS A3 .OM/A3 .0, Stcmdard Welding Terms and Definitions.
Tutorial information regarding techniques of welding or details of equipment setup or operation is beyond the scope of this specification. For more information on this subject and recommended practices. refer to the latest published version of AWS C7.2, Recommended Practices for Laser Welding. Cutting, amid Allied Processes.
1.1.1 Materials. This specification covers all major engineering alloys including:
(1) Ferrous Alloys (e.g.. Carbon steels, stainless steels, etc.);1
(2) Nonferrous Alloys (e.g.. Alloys of Al, Ni, Ti, etc. and Super-alloys)
(3) Heat-Resisting and Refractory Metal Alloys (e.g.. Alloys of Mo. Ta, W. etc.);
(4) Other Alloys (e.g., Be and Cu alloys, precious metals);
(5) Nonmetals (Plastics, polymers. etc.).
1.1.2 Qualification Categories. There are three categories to which welds may be qualified: Class A, B, or C. Classification levels are intended to delineate inspection level and process control. Examples of acceptance criteria, which may be applied to the classification levels. are presented in Annex D.
1.1.2.1 Class A—Critical Applications. Critical weldments include those where a failure ot any portion of a weidment would cause loss of system, loss of major component, loss of control, unintentional release of critical stores, such as fuel or cargo, or endangerment of personnel.
1.1.2.2 Class B—Semicritical Applications. Semicritical weidments include those where a failure of any portion of a weldment would reduce the overall efficiency of the system, but loss of the system or endangerment of personnel would not he experienced.
1.1.2.3 Class C—Noncritical Applications. Noncritical weldments include those where a failure of any portion of a weldrnent would not affect the efficiency of the system or endanger personnel.
1.2 Units of Measure. This standard makes use of both U.S. Customary Units and the International System of Units (SI). The latter are shown within brackets I ] or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore, each systeni must be used independently.
1.3 Safety. Safety and health issues and concerns are beyond the scope of this standard: some safety and health information is provided, but such issues are not fully addressed herein.
Safety and health information is available from the following sources:
American Welding Society:
(1) ANSI Z49. 1, Safety iii Welding, Culling, and Allied Pmcesses
(2) AWS Safety and Health Fact Sheets
(3) Other saiCty and health information on the AWS website.AWS C7.4-C7.4M pdf download.