If your document says “DIN 8570 B” specifying “Part 1” or “Part 2,” assume Part 2, Quality Level B (weld imperfections).
Official copies of these standards, including the historical DIN versions and current ISO equivalents, are available through authorized distributors: General Tolerances for Welded Structures | PDF - Scribd din 8570 b pdf
Limits for deviations in length and angle. If your document says “DIN 8570 B” specifying