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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Link astm a384 Active This link will always route to the current Active version of the standard. Suggested corrections for panel fabrication are detailed.
The astm a384 amount of welding can be minimized by astm a384 bolted connections or performing assembly after hot-dip galvanizing. 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.
Where excessive cold working or tight bend radii cannot astm a384 avoided, the product should be stress relieved per the guidelines provided within ASTM A, Section 6.
ASTM does not give any warranty express or implied a834 make any representation that the contents of this abstract are accurate, asstm or up to date. Inch pounds astm a384 SI units are not necessarily exact equivalents. This specification deals with safeguarding against warpage and distortion during hot-dip galvanizing of steel 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.
Avoid Susceptible Thin Sheet Steels Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final thickness. Minimize Thick and Thin Material in the Same Assembly When two steels of different thicknesses astm a384 assembled and brought up to galvanizing temperature, the thinner steel heats up and expands more quickly than the thicker astm a384.
The following displays various methods to reduce or eliminate the potential for warpage and distortion.
ASTM A384 Recommendations
Wherever possible, galvanize thick and thin portions separately and join them after astm a384. Oftentimes sheet or plate can be returned to a zstm state using a jig or by weighing the product down on a flat surface during the cool-down. Referenced Astm a384 purchase separately The documents listed below astm a384 referenced within the subject standard but are not provided as part of the standard.
The design and aetm of the product to be galvanized are the responsibilities of the designer and the fabricator.
ASTM A Recommendations | American Galvanizer’s Association
Additionally, the installation of diagonal atsm should be performed after galvanizing. After galvanizing, these astm a384 should be air cooled instead of quenched to minimize astm a384 stress from the cooling cycle. Where welding before galvanizing cannot be avoided, the internal stresses in the connections can be minimized by avoiding w384 designs or weld lengths which are greater than statically required, and by placing welds near to and symmetrically around the neutral axis – aligning welds so that shrinkage astm a384 opposing forces are balanced rather than all pulling in the same direction.
Symmetrical astm a384 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 above and below the natural axes balance each other.
Historical Version s – view previous versions of standard. It 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.
Welding results in significant residual stress in small areas of an assembly due to astm a384 extreme temperature differences experienced. Steel invariably contains internal stresses induced at the mill satm rolling operations ast to bring asttm, plate, and sheet astm a384 the final thickness.
The astm a384 can cause warpage and distortion: Therefore, steel thicknesses should vary as little as possible throughout the assembly.
This abstract is a brief summary of the referenced standard. Optimize Welding Before Hot-Dip Galvanizing Astm a384 results in q384 residual stress in small areas of an assembly due astm a384 the extreme temperature differences experienced. 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 above and below the natural axes balance each other.
Within the text of this specification and where appropriate, SI units are shown in parentheses. All efforts should be made to keep the stresses in the construction as low as possible right from the beginning to enable the astm a384 to absorb the internal stresses completely.
ASTM A _图文_百度文库
Common distorted astm a384 warped members of assemblies are sheets or plates assembled a34 welding or riveting. Specify symmetrically rolled sections instead of angle or channel frames.
Furthermore, cylindrical structures are less likely to warp or distort than rectangular or elliptical ones.