AWS B2.2/B2.2M PDF

This specification provides the requirements for qualification of Brazing Procedure Specifications (BPSs). This specification also provides requirements for the performance qualification of brazers and brazing operators. This specification is intended for use where referenced by a product standard or contract document.

Employers shall be responsible for the brazing done by their organization, including the use of qualified brazing procedures, qualified brazers, and qualified brazing operators. It is the Employer's responsibility to assure that Brazing Procedure Specifications meet any additional requirements of the Referencing Document. Each Employer shall maintain the applicable Brazing Procedure Specifications, Brazing Procedure Qualification Records (BPQRs), and Brazing Performance Qualification Records during the period of their use.

When not otherwise specified by the Referencing Document, the edition of this specification to be used shall be established in accordance with the following: (1) editions may be used at any time after the effective date of issue; (2) the latest edition of this document should be used for new contracts; (3) editions established by contract date may be used during the entire term of the contract, or the provisions of later editions may be used when agreed upon by the contracting parties.

This document is intended primarily for use with the following brazing processes:

(1) Torch Brazing (TB)

(2) Furnace Brazing (FB)

(3) Induction Brazing (IB)

(4) Resistance Brazing (RB)

(5) Dip Brazing (DB)

(6) Infrared Brazing (IRB)

(7) Diffusion Brazing (DFB)

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

Safety and health issues and 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, and applicable federal, state, and local regulations.

Base Metals. The grouping of base metals by Base Metal Number (BM No.) in Table B.1 has been made on the basis of metallurgical compatibility, chemical composition, and brazeability to decrease the number of required brazing qualifications. The grouping does not imply that base metals may be indiscriminately substituted within the same BM No. without consideration of their applicability. For some materials or combinations of materials, additional tests may be required by the procuring activity, the Referencing Document, or the design engineer.

Base metals are identified by their American Society for Testing and Materials (ASTM), American Bureau of Shipping (ABS), or Unified Numbering System (UNS) designations. Cross reference specifications, listed in the Unified Numbering System for Metals and Alloys opposite a given UNS No., are included in the same BM No. group as the given UNS No. An American Society of Mechanical Engineers (ASME) designation, which is the same as an ASTM designation preceded by the letter S, is included in the same BM No. group.

Eight categories are included as follows:

(1) Ferrous metals (BM Nos. 100 through 180)

(2) Aluminum and aluminum alloys (BM Nos. 200 through 220)

(3) Copper and copper alloys (BM Nos. 300 through 360)

(4) Nickel and nickel alloys (BM Nos. 400 through 420)

(5) Titanium and titanium alloys (BM No. 500)

(6) Zirconium and zirconium alloys (BM No. 600)

(7) Magnesium alloys (BM No. 700)

(8) Cobalt alloys (BM No. 800)

Filler Metals. The grouping of filler metals by Filler Metal Number (FM No.) in Table C.1 has been made on the basis of chemical composition to decrease the number of required brazing qualifications. The grouping does not imply that filler metals may be indiscriminately substituted within the same FM No. without consideration of their applicability. AWS A5.8/A5.8M, Specification for Filler Metals for Brazing and Braze Welding, provides detailed requirements and general applicability of filler metals.

Filler metals other than those listed in AWS A5.8/5.8M may be used provided such filler metal meets the qualification requirements of this specification. For such filler metals, the term "special" shall be listed on the BPS and BPQR in lieu of an FM No.