En Iso 13920-bf |best| -

These define the allowable variation in the overall length of a welded component. For example, a beam with a nominal length of 1000mm might have a tolerance of roughly ± 2mm or ± 3mm depending on specific sub-sections of Class B. 2. Angularity Tolerances (Class B)

For example, a 1,000 mm beam manufactured to Class B may allow a few millimeters of variation in straightness, whereas the same beam in Class A would demand significantly less. A steel plate with a nominal dimension of 2,500 mm and a specified flatness tolerance of Class F would allow a deviation of 6 mm across its length.

is a critical engineering specification that establishes a standardized framework for the general tolerances of welded constructions , explicitly pairing dimensional class B (medium accuracy for linear and angular dimensions) with geometrical class F (standard accuracy for straightness, flatness, and parallelism). This universal quality baseline removes individual engineering drawing clutter while streamlining manufacturing across global supply chains. en iso 13920-bf

The measurement method must be appropriate for the precision required. For Class B tolerances, reliable squares, calipers, and straightedges are generally adequate. In contrast, Class A tolerances often necessitate more expensive instruments like laser measurement systems or coordinate measuring machines (CMMs). Testing methods are defined in the standard, including:

The code is split into two distinct parts that cover different geometric features: B (Linear and Angular Dimensions): These define the allowable variation in the overall

Thus, "EN ISO 13920-BF" signifies that the drawing is governed by the EN ISO 13920 standard. This means that all welded dimensions are to be manufactured to general tolerance (the standard medium precision for lengths and angles), while all applicable shape and position features must adhere to general tolerance Class F (a medium precision for geometry).

Strong, closely spaced tack welds maintain the initial fit-up geometry before the structural passes are laid down. Angularity Tolerances (Class B) For example, a 1,000

EN ISO 13920-BF applies to various industries, including:

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

EN ISO 13920-BF specifies general tolerances for welded constructions and position tolerances for plates. The standard applies to welded constructions made from steel, aluminum, and other metals. The tolerances specified in EN ISO 13920-BF are essential for ensuring that welded products meet the required quality and accuracy standards.

The standard covers the following aspects: