En Iso 13920-bf [upd]
By adhering to established, recognized tolerances, manufacturers ensure that structures can withstand calculated loads, reducing the risk of structural failure.
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. en iso 13920-bf
"USE STANDARD WELDING TOLERANCES"
EN ISO 13920-BF defines a specific set of "General Tolerances" for welded structures. It is intended to replace specific tolerance indications on technical drawings where high precision is not critical. The classification represents a Medium/Fine tolerance grade, making it the most commonly specified default for structural steel and general machinery welding where aesthetics and fit-up are important, but machining-level precision is not required. The tolerances specified in EN ISO 13920-BF are
Specifically targets "straightness" and "parallelism" to prevent "banana" shaped beams. ISO 13920-BF )
: This letter assigns Tolerance Class B to all linear and angular dimensions, representing a "medium" level of accuracy for workshop manufacturing.
The designation EN ISO 13920-BF a specific set of general tolerances for welded constructions, combining two different accuracy classes defined in the for linear/angular dimensions and for form and position Breakdwon of "BF" When this standard is cited on a drawing (e.g., ISO 13920-BF ), it indicates the following requirements: B (Linear/Angular Dimensions):