This standard is issued under the fixed designation A/AM; the number 1 This practice is under the jurisdiction of ASTM Committee A05 on Metallic-. In all cases only the current version of the standard as published by ASTM is to be considered the official document. Designation: A – 76 (Reapproved ) . ASTM A – A M – 02 – Download as PDF File .pdf), Text File .txt) or read online.
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In welding any intermediate lengths along one side of a common member, care should be taken to prevent warpage of the common member due to the application of high heat on the same side at various intervals along its length. A34 precautions to fabricate properly and prepare the material for galvanizing to prevent embrittlement are described in Practice A Historical Version s – view previous qstm of standard. A number in parentheses indicates the year of last reapproval.
The design and fabrication of the product to be galvanized are the responsibilities of the designer and the fabricator. Last previous edition A – After galvanizing, these products should be air cooled instead of quenched to minimize induced stress from the cooling cycle.
Optimize Welding Before Hot-Dip Galvanizing Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced.
If the angie steel frame and sheets are punched prior to galvanizing the recommended procedurethe use of drift pins to bring the holes into alignment should be avoided as far as possible at the time the sheets and frame are assembled.
All efforts should be made to keep the stresses in the construction as low as possible right from the beginning to enable the steel to absorb the internal stresses completely. This abstract is a brief summary of the referenced standard. Channels and other nonsymmetrical sections should be avoided for the framework of a sheet metal assembly that is to be hot-dip galvanized whenever it is possible to use symmetrical shapes or sections.
Originally published as A – 55 T. Oftentimes sheet or plate can be returned to a flattened state using a jig or by weighing the product down on a flat surface during the cool-down. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Within the text of this specification and where appropriate, SI units are shown in parentheses. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM A384 Recommendations
Practice ASTM A provides guidance on safeguarding against warpage and distortion for optimum hot-dip galvanizing and shall be complied with in both design and fabrication. In nearly every case, regardless of size, channels require straightening after galvanizing.
Suggested corrections for panel fabrication are detailed. Inch pounds and SI units are not necessarily exact equivalents.
ASTM A Recommendations | American Galvanizer’s Association
The following can cause warpage and distortion: Where excessive cold working or tight bend radii cannot be avoided, the product should be stress relieved per the guidelines provided within ASTM A, Section 6.
A – 76 Reapproved Asm Practice for Safeguarding Against Warpage and Distortion During Hot-Dip Galvanizing of Steel Assemblies’ This standard is issued under the fixed designation A ; the number immediately foliowing the designation indicates the year of original adoption or, in the case of revision, the year of last revision.
Furthermore, cylindrical structures are less likely to warp or distort than rectangular or elliptical ones. A superscript epsilon E indicates an editorial change since the last revision or reapproval. Factors in Warpage and Distortion 3.
Suggested Corrections for Panel Fabrication 4. This specification deals with safeguarding against warpage asttm distortion during hot-dip galvanizing of steel assemblies. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. The following displays various methods to reduce or eliminate the potential for warpage and distortion. These rivets can be countersunk or flat head if the protruding head of the ordinary button or round head rivet is objectionable.
Wherever possible, galvanize thick and thin portions separately and join them after galvanizing. The overall amount of welding can be minimized by using bolted connections or performing assembly after hot-dip galvanizing. Specify symmetrically rolled sections instead of angle or channel frames. Thls stendard Is subject to revision at any tlme by the responsible technical commHtee and must be reviewed every five years and H not revised, either reapproved or withdrawn.
It is recommended that welding procedures be carried astmm in conformancewith the pertinent specificationsof the American Welding Society. This is not true of an I-beam, pipe, H-column, or any other section that is symmetrical about both its major axes. Therefore, steel thicknesses should vary as little as possible throughout the assembly. Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced.
It is informational only and not an official part of the standard; the full text of asfm standard itself must be referred to for its use and application. Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final thickness.