AWS D17.2/D17.2M pdf free download

AWS D17.2/D17.2M pdf free download.Resistance Welding for Aerospace Applications.
2. Normative References
The documents listed below are referenced within this publication and are mandatory to the extent specified herein. For undated references, the latest edition of the referenced standard shall apply. For dated references, subsequent amendments to. or revisions ofany of these publications do not apply.
AWS A3.OM/A3.O, Standard Vlding Terms and Definitions, Including Terms for Adhesive Bonding, Brazing,
Soldering, Thermal Cutting, and Thermal Spraying.
AWS A2.4, Standard Symbols for L4lding, Brazing, and Nondestructive Examination. NAS 410, NAS Certification & Qualification of Nondestructive Test Personnel.
3. Terms and Definitions
AWS A3.OM/A3.O, Standard Vlding Terms and Definitions, provides the basis for terms and definitions used herein. However, the following terms and definitions are included below to accommodate usage specific to this document.
close-spaced spot welds. Spot welds on sheet placed less than two diameters apart (Q, as defined in Table 11), center to center. Such proximity may require more power than other spot welds.
coring. Incipient melting adjacent to the nugget.
Engineering Authority. The contracting agency or corporation that acts for and in behalf of the customer on all matters within the scope of this standard. The Engineering Authority has responsibility for the structural integrity or maintenance of airworthiness of the hardware and compliance with all contract documents.
fabricator. The organization responsible for producing weldments that satisfy the design and contract requirements. foil. A material having thickness of 0.008 in [0.2 mm] or less.
metallographic section. A transverse cut on the diameter of a spot weld or across a seam weld, or a longitudinal cut down the center of a seam weld, polished down to near the center of the weld and etched to accentuate the metallographic structure.
nugget. The weld (fused) metal joining the parts in spot, seam, or projection welds.
peel test. A mechanical test in which the corners (or sides) of seam or spot welded foil or sheet members are gripped and pulled apart to determine if the joint fails by delamination, by fracture of a cleaved surface, or by tearing of a button (plug) out of the parent material. Delamination, in contrast to fracture, is a sign of no fusion between the two adjacent members. A button or plug. which is pulled out of the removed member, is not necessarily equal in size to the cast nugget underlying it.
penetration. The extent of the nugget (fusion zone) into the thickness of a joined member.
production witness specimen. Test coupon welded using production setup and destructively tested to provide data on the quality of production welds.
resistance weld size. The diameter of a spot weld nugget or the width of a seam weld nugget measured at the plane of the faying surfaces.
sheet. A material having thickness. for the purpose of this specification, of more than 0.008 in through 0.250 in [0.20 mm through 6.35 mm].
welding conditions. All circumstances surrounding the making of a given weld, including material, configuration, material preparation, electrode shape, machine number, and all weld parameters. Weld conditions that are relevant require documentation. A suggested form for documentation is found in Annex A.
welding parameters. Machine settings or adjustments, such as, but not limited to, weld current, weld time, and electrode force.AWS D17.2/D17.2M  pdf download.