AWS C3.3:2008 pdf download.Recommended Practices for the Design, Manufacture,and Examination of Critical Brazed Components
1. Scope
These recommended practices encompass those proce-dures that should be followed in the design, manufacture,and examination of brazed joints for critical components in order to assure their reliability in service.
The procedures recommended represent the best current practice and are necessary to the control of brazed joint quality. These practices are applicable to all products and brazing processes. Whenever any or some of these prac-tices are omitted when producing critical components,the omission should be the result of a rational decision,not the result of a lack of knowledge of the best practice.This document is divided into clauses addressing mate-rials, design, manufacturing, and examination. These clauses are followed by Annex A, which presents a list of informative references; Annex B, which presents sample specifications that are intended as guides for the prepara-tion of the user 's documents; Annex C, which presents a discussion of brazing risk management; Annex D, which presents a table relating to the quantification of the scope and magnitude of braze induced discontinuities; Annex E, which presents systematic criteria for design of brazed components; and Annex F, which presents guidelines for the preparation of inquiries for AWS technical committees.
Procedures for the protection of the safety and health of those performing brazing and related operations are of great importance. Among the potential hazards to be considered are exposure to fumes and gases, radiation,and tox ic materials. Safety and health issues may not be fully addressed by this standard. Users of this standard should consult ANSI Z49.1, Safety in Welding, Cutting,and Allied Processes, applicable federal, state, and local regulations and other relevant documents concerning safety and health issues not addressed herein. Additional information on safety and health is included in the Amer-ican Welding Society Brazing Handbook.
5. Design
5.1 Basic Considerations. Reliability requires deliberate steps during the design phase to assure the effective con-trol of quality. Quality control procedures must not be afterthoughts that are specified once the design is final-ized, they should be developed concurrently with the design and verified as appropriate. Consideration should be given to the practical aspects of brazing, the charac-teristics of the filler and base materials involved, and the limitations of the inspection procedures.AWS C3.3 pdf download.