Free Engineering Tool
Weld Quality Levels — ISO 5817
Check if a measured weld imperfection meets ISO 5817 quality level B, C, or D. Select imperfection type and enter the measured value.
Acceptance Check
ISO 5817 Acceptance Limits (Simplified)
| Imperfection | Level D | Level C | Level B |
|---|---|---|---|
| Undercut | ≤1.0 mm | ≤0.5 mm | ≤0.5 mm |
| Excess reinforcement (butt) | ≤2.0 mm | ≤1.5 mm | ≤1.0 mm |
| Linear misalignment | ≤1.5 mm | ≤1.0 mm | ≤0.5 mm |
| Single pore | ≤4.0 mm | ≤2.5 mm | ≤1.5 mm |
| Incomplete penetration | ≤1.0 mm | Not permitted | Not permitted |
| Cracks | Not permitted at any level | ||
These are simplified values for plate thickness 3–30 mm. Actual limits per ISO 5817 depend on plate thickness and may include percentage-based criteria.
Nikolai Shelkovenko
Nikolai Shelkovenko is a vibration analysis engineer and the founder and CEO of Vibromera. For more than 15 years he has balanced rotating equipment in the field rather than on a test bench: mulchers, industrial fans, crushers, centrifuges, shafts and spindles. That work is what the Balanset instruments grew out of — they were designed as a tool a specialist can carry to the machine and use alone, on site, not as laboratory equipment. Vibromera was founded in 2017 and has been based in Porto, Portugal, since 2023. Development, assembly and support of the Balanset line all happen here. The flagship instrument is the Balanset-1A, a portable analyser for single- and two-plane balancing and for vibration diagnostics. Nikolai is personally involved in customer support, in working through difficult balancing cases and in the development of the software. He works with customers worldwide, in any language.
