Here is the core of what you’ll find inside the DIN 8570 B PDF. The standard defines three quality levels for weld imperfections:
| Quality Level | Stringency | Typical application | | --- | --- | --- | | B (High) | Very strict | Dynamic loads, fatigue-critical components, pressure equipment. | | C (Medium) | Standard general fabrication | Static loads, structural steelwork, machinery frames. | | D (Low) | Least strict | Non-critical supports, temporary structures, repair welding. | din 8570 b pdf
Key imperfections limited by quality level B: Here is the core of what you’ll find
If your drawing calls out “DIN 8570-B,” the inspector will use the smallest allowable limits for most defects. If your drawing calls out “DIN 8570-B,” the
If you are implementing a new quality management system (e.g., ISO 3834 for welding), you should adopt ISO 5817. However, the DIN 8570 B PDF remains a useful historical reference because:
For new designs, always use ISO 5817. But keep a copy of DIN 8570-B on hand for maintenance and repair of older structures.
If all imperfections are within limits → weld accepted. If any exceed limits → repair (grind, re-weld, etc.) and re-inspect.