Din 8570 B — Pdf

| Search term | Actually means | | --- | --- | | DIN 8570 B PDF | Weld imperfection tables, strictest quality level (or Form B of Part 2). | | DIN 8570 C PDF | Medium quality level (most common in general fab). | | DIN 8570 Form A | Shape tolerances (angles, straightness) – from Part 1. | | DIN 8570 T1 | Part 1 – Shape deviations. |

If your document says “DIN 8570 B” without specifying “Part 1” or “Part 2,” assume Part 2, Quality Level B (weld imperfections).

Without a clear standard, weld inspection becomes subjective. DIN 8570-B provides numerical limits. Example: "Maximum allowable porosity diameter for quality level B is 0.3 mm." No guesswork. din 8570 b pdf

While we cannot reproduce the entire standard here (copyright protected), any genuine DIN 8570 B PDF will include detailed tables. Below is a summary of typical categories and limits for Quality Level B (strictest):

| Imperfection | Quality Level B Limit | |--------------|------------------------| | Longitudinal crack | Not permitted | | Transverse crack | Not permitted | | Porosity (single pore) | Max. 0.3 mm diameter | | Porosity (cluster) | Max. 2% of weld area | | Undercut | Depth ≤ 0.5 mm | | Excess weld metal (reinforcement) | ≤ 1 mm + 0.1 x weld width | | Incomplete penetration | Not permitted (except by design) | | Concavity (root side) | ≤ 0.5 mm | | Linear misalignment | ≤ 0.2 x plate thickness, max. 2 mm | | Search term | Actually means | |

For quality levels C and D, the limits are more lenient (e.g., larger porosity allowed, deeper undercut permitted).

Send the customer a written deviation request (RFI): Without a clear standard, weld inspection becomes subjective

“DIN 8570 is withdrawn. We propose using ISO 5817:2023, Quality Level C, which provides equivalent limits for all applicable imperfection types. No change in acceptance quality is expected.”

Once signed, you can stop searching for the old PDF.

Many large engineering firms subscribe to IHS Markit, Techstreet, or Perinorm. Ask your QA department.

Many engineering drawings and welding procedure specifications (WPS) explicitly cite DIN 8570-B. If you are fabricating for German or European markets, your customer may require compliance with this standard.