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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Minimize Thick and Thin Material in the Same Assembly When two steels of different thicknesses are assembled and brought up to galvanizing temperature, the thinner steel heats up and expands more quickly than the thicker steel. Aa384 welding before galvanizing cannot be sstm, the internal stresses in the connections can be minimized by avoiding joint designs or weld lengths which are astm a384 than astm a384 required, and by placing welds near to and symmetrically around the neutral axis – aligning welds so that shrinkage and opposing forces are balanced rather than all pulling in the same direction.
The following displays various methods to reduce astm a384 eliminate the potential for warpage and distortion.
ASTM A _图文_百度文库
The design and fabrication of the product to be galvanized are the responsibilities of the designer and the fabricator. Avoid Susceptible Thin Sheet Astm a384 Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, astm a384 sheet to the final thickness.
Oftentimes sheet or plate can be returned to astm a384 flattened state using a38 jig or by weighing the product down on a flat surface during the cool-down. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM A Recommendations | American Galvanizer’s Association
Astm a384 Welding Before Hot-Dip Astm a384 Welding results adtm significant residual stress in small areas of an assembly due to the extreme temperature differences experienced. Therefore, steel thicknesses should vary as little as possible throughout the assembly. Link to Active This link will always route to the current Active version of the standard. The following can cause warpage and distortion: Inch pounds and SI units are not necessarily exact equivalents. When two steels of different thicknesses are assembled and brought up to galvanizing temperature, the thinner steel heats up and expands more quickly than the thicker astm a384.
Astm a384 is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Within the text of this specification and astm a384 appropriate, SI units are shown in parentheses.
The overall amount of astm a384 can be minimized by using bolted connections or performing assembly after hot-dip galvanizing. Historical Version s – view previous versions of standard. This abstract is a brief summary of the referenced standard.
ASTM A384 Recommendations
Suggested corrections for panel fabrication are detailed. Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final astm a384.
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. Astm a384 does not give any warranty express astm a384 implied or make any representation that the contents of this abstract are accurate, complete or up to date. Wherever possible, galvanize thick and thin portions separately and join them after galvanizing.
After galvanizing, these products should be air cooled instead of quenched to minimize induced stress from the cooling cycle. Additionally, the installation of diagonal members should be performed after galvanizing. All efforts should be made to keep the stresses in the construction as low as possible right from astm a384 beginning to enable the steel to absorb the internal stresses astm a384.
Furthermore, cylindrical structures are less likely to warp or distort than rectangular or elliptical ones. Asymmetrical Design Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber beams, channels, tees, custom beams, girders because the thermal expansion forces astm a384 and below the natural axes balance each other.
Standard: ASTM A384
Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber beams, channels, tees, custom beams, girders because the thermal astm a384 forces above and below the natural axes balance each astm a384. Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced. This specification deals with safeguarding against warpage and distortion astm a384 hot-dip galvanizing of steel assemblies.
Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. Specify symmetrically rolled sections instead of angle or channel frames.
Where excessive cold working or tight bend radii cannot be avoided, the product should be stress relieved per the guidelines a3844 within ASTM A, Astm a384 6.