ISO 13920 is a standard that specifies general tolerances for linear and angular dimensions and for shape and position of welded structures in four classes, these being based on customary workshop accuracy. The main criterion for the selection of a particular class should be the functional requirements.
If you are looking for a free PDF version of this standard, you may have a hard time finding it online. According to the official website of ISO, the International Organization for Standardization, ISO 13920 is under development and has not been published yet[^1^]. Therefore, any PDF file that claims to be ISO 13920 may be outdated, incomplete, or unauthorized.
However, there are some ways to access the draft version of ISO 13920 or the previous edition of ISO 13920:1996. One option is to use an academic platform such as Academia.edu, where you can find a PDF file uploaded by a user named Limber S[^2^]. However, this file may not be the latest or the most accurate version of the standard, and you should use it at your own risk.
Another option is to use a document sharing website such as Scribd, where you can find a PDF file that contains some information about ISO 13920 BF[^3^]. However, this file may not be the full text of the standard, and you may need to sign up or pay for a subscription to download it.
The best way to get a reliable and official version of ISO 13920 is to purchase it from the ISO website or from an authorized distributor. This way, you can ensure that you are getting the most updated and accurate version of the standard, and that you are supporting the work of ISO and its technical committees.
ISO 13920 is an important standard for the welding industry, as it provides a common framework for specifying and verifying the dimensional accuracy of welded structures. It also helps to reduce the risk of errors, defects, and disputes that may arise from unclear or inconsistent tolerances.
The standard applies to all types of welded structures made of metallic materials, such as steel, aluminum, copper, or titanium. It covers both manual and automatic welding processes, such as arc welding, gas welding, resistance welding, or laser welding. It does not apply to special types of welding, such as explosive welding or friction stir welding.
The standard defines four classes of tolerances: A, B, C, and D. Class A is the most stringent and class D is the least stringent. The choice of class depends on the functional requirements of the welded structure, such as its strength, stiffness, appearance, or service life. The standard also provides tables and figures that show the numerical values of the tolerances for different dimensions and shapes.
ISO 13920 is compatible with other ISO standards related to welding, such as ISO 5817, which specifies the quality levels for imperfections in welds, or ISO 3834, which specifies the quality requirements for fusion welding of metallic materials. The standard also refers to other ISO standards for the definitions and symbols of welding terms, such as ISO 2553 or ISO 4063.
ISO 13920 is intended to be used by all parties involved in the design, fabrication, inspection, and acceptance of welded structures, such as engineers, welders, inspectors, or customers. The standard provides guidance on how to specify the tolerances in the drawings or documents, how to measure the dimensions and angles of the welded structures, and how to evaluate the conformity of the welded structures with the specified tolerances.
ISO 13920 is a voluntary standard that does not impose any legal obligations or liabilities on its users. However, it may be adopted by national or regional regulations or contracts as a reference for the quality and performance of welded structures. Therefore, it is advisable to check the applicable laws and agreements before using the standard. aa16f39245