Non-destructive & destructive testing – standard-compliant and quickly documented.
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Welding
Schematic representation of a weld seam
Fig. Permissible limits DIN EN ISO 5817:2014-06
We inspect weld seams of all kinds – non-destructively (NDT) and destructively – and provide fast, standard-compliant test reports for your quality assurance. Our personnel are industry- and material-specifically qualified for welded joints and work according to DIN EN 1090.
We pay special attention to the heat-affected zone (HAZ), as this is often where weaknesses occur that are critical for the quality of the welded joint.
Need help classifying welding imperfections? See our overview of weld seam defects (ISO 5817) including defect groups and acceptance levels.
Methods for Weld Seam Inspection
NDT & destructive tests for weld seams
Zeros GmbH is an independent testing laboratory for destructive and non-destructive materials testing. We support companies from incoming inspection to series release – including digital test reports and full traceability.
We operate under accreditation to DIN EN ISO/IEC 17025 (quality management for laboratories). See our current accreditation information here.
We are accredited by DAkkS to DIN EN ISO/IEC 17025. This standard ensures that test methods, equipment control, personnel qualification and reporting meet the highest requirements.
An overview of services and scopes is available on our homepage.
Our portfolio covers NDT (UT, RT, MT, PT, VT), mechanical testing (tensile, hardness, Charpy), metallography (microstructure, grain size, coating thickness) and chemical analysis (e.g. OES, XRF). We also provide specimen preparation, documentation and consulting.
Please contact us by email or use the contact option on the website. Share material, standard/specification and quantity – we'll get back to you promptly with a solution.
Typical Weld Seam Defects – Causes & Suitable Testing Methods
| Defect Group | Defect Type | Causes | Detectability |
|---|---|---|---|
| Surface Defects | Cracks | Unfavorable welding parameters, stresses, insufficient pretreatment | UT · RT · MT · PT · VT |
| Volume Defects | Porosity | Inclusions of gases, contamination in the weld pool | UT · RT |
| Volume Defects | Lack of fusion | Insufficient fusion of the weld seam with base material | UT · RT |
| Volume Defects | Slag inclusions | Unremoved slag in the weld pool, poor cleaning | UT · RT |
