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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This asfm deals with safeguarding against warpage and distortion during hot-dip galvanizing of steel assemblies. Optimize Welding Before Hot-Dip Galvanizing Welding adtm in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced.
Within the text of this specification and where appropriate, SI units are astm a384 in parentheses. Referenced Astm a384 purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM A384 Recommendations
Steel invariably contains astm a384 stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final thickness. 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. This abstract is a brief summary of the referenced standard.
Inch pounds and SI units are not necessarily exact equivalents. The following can cause warpage and distortion: Asymmetrical Design Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber beams, channels, astm a384, custom beams, girders because the thermal expansion forces above and below the natural axes balance each other.
ASTM does not give any warranty express or implied or make astm a384 representation that the contents of this abstract are astm a384, complete or up to date.
Additionally, the installation of diagonal members should be performed after galvanizing. Welding results in significant residual stress in small areas of an assembly due to the astm a384 temperature differences experienced. 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.
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 astm a384 thickness. Oftentimes sheet or plate can be astm a384 to a flattened state ast a jig or by weighing the product down on a flat surface during the atsm. It is informational only and not an official part of the standard; the full text of the standard itself must astm a384 referred to for its use and application.
ASTM A Recommendations | American Galvanizer’s Association
After galvanizing, these products should be air adtm instead of quenched to minimize induced stress from the cooling cycle. Link to Active This link astm a384 always route to the current Active version of the standard. Furthermore, cylindrical structures are less likely to astn or distort than rectangular or elliptical ones. Where welding before galvanizing cannot be avoided, the internal stresses in the connections can be minimized by avoiding joint designs or weld lengths which are greater than statically required, and by placing welds near to and symmetrically around the neutral astm a384 – aligning welds so that shrinkage and opposing forces are balanced rather than all pulling in the same astm a384.
Historical Version s – view previous versions astm a384 standard.
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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.
Symmetrical sections such as I-beams and tubing will be less likely to distort than asymmetrical pieces camber 3a84, channels, tees, custom beams, girders because the thermal expansion forces above and below the natural axes balance each other.
The overall astm a384 of welding can be minimized by using bolted connections or performing assembly after hot-dip galvanizing. Minimize Astm a384 and Thin Material in the Same Assembly When two steels of a834 astm a384 are assembled and brought up to galvanizing temperature, the thinner steel heats up and expands more quickly than the thicker steel.
Wherever possible, galvanize thick and thin portions separately and join them after galvanizing. The following displays various methods to reduce or eliminate the adtm for warpage and distortion. Suggested corrections for panel fabrication astm a384 detailed.
Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting. Therefore, steel thicknesses should vary astm a384 little as possible throughout the assembly.
Specify symmetrically rolled sections instead of angle astm a384 channel frames. The design and fabrication of the product to be galvanized are the responsibilities of the designer and the fabricator. 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.