AWS C3.9M-C3.9 pdf free download

AWS C3.9M-C3.9 pdf free download.Resistance Brazing.
AWS A3.O, Standard Welding Terms and Definitions, Including Terms for Adhesive Bonding, Brazing, Solder1 ,1g. Thermal Cutting, and Thermal Spraying. provides the basis for terminology used herein.
For the purposes of this document, the following terms and definitions apply:
braze joint. The total area, as defined by the engineering drawing, of the faying surfaces to be joined by brazing and the fillets that form at the edges of that area.
braze joint proper. The total area, as defined by the engineering drawing, of the faying surfaces to be joined by brazing, excluding any fillets that form at the edges of that area.
brazing procedure specification (BPS). A document specifying the required brazing variables for a specific application.
brazing symbol. The symbol on the engineering drawing designating the location, class, and configuration of the brazed joint. Such symbols shall he in accordance with AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examination.
joint dimensions. The joint length is the greater of the two dimensions of the joint parallel to the faying stir- faces. The joint width is the lesser of these two dimensions of the joint. The clearance between the faying surfaces is the third dimension to he considered.
lack of bond. A condition in a brazed joint where although brazing filler metal is present between the laying surfaces, the filler metal does not adhere or form a metallurgical bond with the base metal. It most commonly occurs when brazing filler metal is preplaced between contaminated faying surfaces.
Organization Having Quality Responsibility. The organization responsible to the end user of the product for the quality of the product and its suitability for the intended use. This organization is usually the manufacturer and marketer of the final product in commercial business and the prime contractor in government procurement. Although such organizations may subcontract brazing and related operations to others, they cannot delegate the ultimate responsibility for the service suitability of the product to these subcontractors.
surface porosity. A roughened or spongy appearance or open pores on the surface of the brazed fillet. Such pores arc not sharply linear or crack-like in shape. Surface porosity is confined to the fillet and does not progress into the brazed joint proper.
void. Any area of the braze joint proper that is not completely filled with brazing filler material.
4. Classification of Brazed Joints
4.1 Method of Classification. Resistance brazed joints are classified in this specification based on two criteria:
the design requirements and the consequences of their failure. It is the responsibility of the Organization Has’ing Quality Responsibility to evaluate these or other factors and assign the proper classification. This classification controls which inspection methods and design limits are required.
4.2 Class A Joints. Class A joints are those joints subjected to high stresses, cyclic stresses, or both, the failure of which could result in significant risk to persons or property, or in significant operational failure.
4.3 Class B Joints. Class B joints are those joints subjected to low or moderate stresses, cyclic stresses, or both, the failure of which could result in significant risk to persons or property, or in significant operational failure.
4.4 Class C Joints. Class C joints are those joints subjected to low or moderate stresses, cyclic stresses, or both, the failure of which would have no significant detrimental effect.AWS C3.9M-C3.9 pdf download.