Non-destructive testing - (VT / PT)Visual & penetrant testing according to DIN EN ISO 9712

Non-destructive testing (NDT) is an indispensable component of the Quality assurance in metal and steel construction.
With modern testing methods Surface defects, pores, cracks or binding defects at an early stage - without damaging the component.

As VT2/PT2-certified tester according to DIN EN ISO 9712 and International Welding Engineer (IWE) I carry out visual and penetration tests and document the results according to standard, reproducible and court-proof.

Test procedure at a glance

Visual inspection (VT according to DIN EN ISO 9712 / 17637)

Visual inspection is the most important non-destructive method for early detection of surface defects.
I check the weld seam geometry, root penetration, penetration notches, distortion, dimensional accuracy and general seam quality.
The assessment is carried out using magnifying glasses, endoscopes, measuring gauges and special lighting.

Typical findings:
- Incomplete weld penetration
- Binding error
- Excessive amplification
- Cracks in the heat-affected zone

Penetrant testing (PT according to DIN EN ISO 9712 / 3452)

The penetration test (penetration test) is used to very fine cracks or pores that are invisible to the naked eye to recognize.
After applying a red or fluorescent penetrant, defects are made visible.

Areas of application:
- Weld seams on stainless steel, aluminium or galvanized steel
- Cast and forged parts
- Sheet metal, beams, brackets, connections

Typical findings:
- Microcracks
- Pores
- Surface defects due to welding distortion or grinding work

Scope of testing and evaluation

I carry out non-destructive testing (NDT) as part of expert reports, quality assurance or production monitoring:

  • Testing of weld seams on building and industrial structures
  • Acceptance tests in steel and plant construction
  • Quality assurance in accordance with EN 1090 / ISO 3834
  • Testing of stainless steel components after surface treatment
  • Testing of welded joints in facades, railings, supporting structures
  • Documentation for operators, courts and certification bodies

Advantages of non-destructive testing

✔️ Fault detection without intervention in the component
✔️ Immediate evaluation on site
✔️ Comparison with standard requirements according to DIN EN ISO 5817 / 10042
✔️ Minimization of rework and downtimes
✔️ Court-proof documentation with photo and test report

Procedure for the audit

  1. Preparation of the surface
    Cleaning, degreasing and visual inspection of the test area.
  2. Test execution (VT / PT)
    Visual inspection or penetration test with certified material.
  3. Evaluation & documentation
    Classification of defects according to DIN EN ISO 5817 / 10042.
  4. Creation of the test report
    Photo documentation, dimensions, evaluation and recommendation.

Standards & regulations

  • DIN EN ISO 9712 - Qualification & certification of personnel for non-destructive testing
  • DIN EN ISO 17637 - Visual inspection of welded joints
  • DIN EN ISO 3452-1 - Penetrant testing
  • DIN EN ISO 5817 / 10042 - Assessment of irregularities
  • DIN EN ISO 3834 - Quality requirements for fusion welding
  • DIN EN 1090-2 - Execution of steel structures

Typical fields of application

  • Steel construction, hall construction, plant construction
  • Welded constructions on stairs, railings, facades
  • Bridge construction and steel structures
  • Stainless steel connections and special constructions
  • Testing of series production parts

Practical examples from expert reports and damage analyses

Contact us

Do you need quality assurance during construction or support with EN 1090 audits?

E-Mail: info@metall-sv.de

Phone: 06131 / 89 39 500

Or use our Contact form.