Understanding EN ISO 13920-BF: General Tolerances for Welded Constructions
Compliance with EN ISO 13920-BF is verified using standard workshop tools such as steel straightedges, tape measures, and vernier callipers. It is important to note that this standard covers dimensional accuracy, not weld quality (like cracks or porosity), which is instead governed by ISO 5817. IS0 13920 - iTeh Standards en iso 13920-bf
2. Reduced Drawing Clutter By stating "General Tolerances ISO 13920-BD" in the title block, engineers do not need to dimension every tolerance on every view. This makes drawings cleaner and easier to read. Understanding EN ISO 13920-BF: General Tolerances for Welded
BF is widely considered the "standard workshop accuracy" class. It is the "Goldilocks" zone for general mechanical engineering—tight enough to ensure parts align during assembly but loose enough to be achieved by a skilled welder without specialized jigs or constant measurement. Practical Application ISO 13920:2016 - Welding - General tolerances for
Benefits and Advantages
| Parameter | Requirement | |-----------|--------------| | Weld type | Butt weld, single V, or U with backing | | Backing location | Root side | | Backing material | Steel, ceramic, or permanent (specified separately) | | Dimensional tolerance | Class C (medium) or Class D (coarse) per EN ISO 13920 | | Inspection | Visual after backing, then after final weld |