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DIN 8570 is a German standard (Deutsches Institut für Normung) that specifies permissible limits for weld imperfections in fusion-welded joints. Unlike general welding standards that focus on procedures or material properties, DIN 8570 deals exclusively with quality levels based on visual and dimensional inspection.
on a drawing, you’re looking at the standard for general tolerances in welded structures. Specifically,
The "B" section is the practical tool used daily on shop floors and inspection desks. It assigns three quality levels—B, C, and D—where and D is the lowest (most tolerant).
The standard categorizes linear dimensions into four primary classes:
This article provides a comprehensive overview of the DIN 8570-1 standard, focusing on its application, the tolerance classes, and the significance of "Class B" accuracy. What is DIN 8570-1?
What specific or structures are you fabricating?
You can find documentation and partial tables for these standards on platforms like or technical engineering repositories: DIN 8570-1987 General Tolerances on Scribd . DIN 8570-1 Technical Specification on Scribd .