AWS C3.4M/C3.4: second edition

This specification presents the minimum fabrication and quality requirements for the torch brazing of materials such as steels, stainless steels, copper, copper alloys, and heat- and corrosion-resistant alloys as well as other materials that can be adequately torch brazed. Note that the torch brazing of aluminum alloys is addressed in AWS C3.7M/C3.7, Specification for Aluminum Brazing.

The purpose of this specification is to standardize torch brazing process requirements and control brazed joint quality for all applications requiring brazed joints of assured quality. This document establishes minimum requirements for processes and products with a minimum of explanatory information so that sources of ambiguity are minimized. It assigns responsibility for the ultimate quality of the brazed product to a single organization and permits that organization to modify requirements if appropriate to the application. It requires proper documentation of any such modifications.

Procedures for the protection of the safety and health of those performing torch brazing and related operations are of great importance. However, safety and health concerns are beyond the scope of this standard and therefore are not fully addressed herein. Safety and health information is available from other sources, including, but not limited to, ANSI Z49.1, Safety in Welding, Cutting, and Allied Processes.

This standard makes use of both the International System of Units (SI) and U.S. Customary Units. The latter are shown in brackets [ ], or in appropriate columns in tables and figures. The measurements may not be exact equivalents; therefore each system must be used independently.