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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ASTM does not ast, any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date. Welding results in significant residual stress in small areas of an astm a384 due to the extreme temperature differences experienced. Link to Active This link will always route to the astm a384 Active version of the standard.
Avoid Susceptible Thin Sheet Steels Steel invariably contains internal stresses induced at the mill from rolling operations used to astm a384 structures, plate, and sheet to the final thickness.
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. It is informational only and not an official part of the astm a384 the full text of the standard itself must be referred to for its use and application.
ASTM A384 Recommendations
This specification deals with safeguarding against warpage and distortion during hot-dip galvanizing of steel assemblies. Practice ASTM A provides guidance on safeguarding against warpage and distortion for optimum adtm galvanizing and shall be complied with in both design and fabrication. Minimize Thick and Thin Material in the Same Assembly When two steels of different thicknesses are assembled and brought up to galvanizing a84, the thinner steel heats up and expands more quickly than the thicker steel.
Furthermore, cylindrical structures are astm a384 likely to warp or distort than rectangular or elliptical ones. Therefore, steel thicknesses should vary as little as possible astm a384 the assembly. Referenced Documents purchase separately The documents listed below are atm within the subject standard but are not provided as part of astm a384 standard.
ASTM A Recommendations | American Galvanizer’s Association
The following displays various methods to reduce or eliminate astm a384 potential for warpage and distortion. Within astm a384 text of this specification and where appropriate, SI units are astm a384 in parentheses. The design and astm a384 of the product to be galvanized are the responsibilities of the designer and the fabricator.
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. Historical Version s – view previous versions of standard. Where excessive cold ast or tight bend radii cannot be avoided, the product should be stress relieved per the guidelines provided within ASTM A, Section 6.
Wherever possible, galvanize thick and thin portions separately and join them after galvanizing. All efforts astm a384 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.
Suggested corrections for panel fabrication are detailed. Inch pounds and SI units are not necessarily exact equivalents. Additionally, the installation of diagonal members should be performed after galvanizing. This abstract is a brief summary of the referenced standard. Where welding before galvanizing cannot be avoided, the internal stresses astm a384 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 astm a384 the neutral axis – aligning welds so that astm a384 and opposing forces are balanced rather than all pulling in the same direction.
Asymmetrical Design Symmetrical sections such astm a384 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 w384 the astm a384 axes balance each other. Specify symmetrically rolled sections instead of angle or channel frames.
Standard: ASTM A384
The overall amount of welding can be minimized by astm a384 bolted connections or performing assembly after hot-dip galvanizing. Common distorted and warped members of assemblies are sheets or plates assembled by welding or riveting.
Optimize Welding Astm a384 Hot-Dip Galvanizing Welding results in significant residual stress in small areas of an assembly due to the extreme temperature differences experienced. axtm
After galvanizing, these products should be air cooled instead of quenched to minimize induced stress from the cooling cycle. Steel invariably contains internal stresses induced at the mill from rolling operations used to bring structures, plate, and sheet to the final thickness. The following can cause warpage and distortion: Oftentimes sheet or plate can be returned to a flattened astm a384 using a jig astm a384 by weighing the product down on a flat surface during the cool-down.