About the Welding Institute

Institut za varilstvo d.o.o. (the Welding Institute) has been the Slovenian institution for research, education, testing and certification in materials joining since 1952. It operates in Ljubljana and Maribor, is an independent body for the certification of personnel, products and services, and carries out education, training, supervision and research.

What does the Welding Institute do?

Education

Welding specialisations, welder training, NDT courses and seminars. We have been running welding specialisations in south-east Europe since 1952.

Certification

Personnel, welders, procedures, companies to EN 1090 and ISO 3834, pressure equipment. Certification is carried out by the independent unit VARcert.

Laboratory

Accredited destructive and non-destructive testing of welds, chemical analysis and measurements in the field.

Supervision

Supervision of welding work on steel structures, pipelines, energy installations and railway vehicles.

Research

Research and development projects for industry in welding.

Accreditations

Accreditations, authorisations and notified body NB 2042.

We live in the age of the new technologies of the fourth industrial revolution, which demands intensive shifts in the thinking and actions of individuals and companies. Welding has become a high-tech activity that needs a broader base of knowledge, one that goes beyond the limits of basic skills and techniques but still builds on the foundations of knowledge gained over thousands of years and on a common goal: perfect joints.

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Who is who: the Institute, VARcert, SDVT and ANB?

Institut za varilstvo d.o.o. (the Welding Institute) is a limited liability company that carries out education, testing, supervision and research.
VARcert is the independent and autonomous organisational unit of the Institute for certification.
SDVT (the Slovenian Welding Society) issues IIW and EWF diplomas on behalf of the international organisations; it is also ANB Slovenia.
IIW (the International Institute of Welding) and EWF (the European Welding Federation) set the guidelines for the education of welding personnel.

The Institute is authorised by IIW, EWF and SDVT to run education and training programmes for international and European welding coordination personnel (certificate no. 07 of 6 September 2016).

Founded	1952
Headquarters	Ptujska ulica 19, 1000 Ljubljana; Maribor unit, Zagrebška cesta 90
Director	dr.-Ing. Miro Uran
Experts	25 certification experts regularly work with more than 600 companies; more than 40 experts from industry and three Slovenian universities take part in the lectures
Accreditations and authorisations	LP-003, CO-003, CP-011 (Slovenian Accreditation), EU notified body NB 2042, authorisations from IIW, EWF and SDVT
Facts	machine-readable summary

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Frequently asked questions

When was the Welding Institute founded?

In 1952.

Where does the Welding Institute operate?

In Ljubljana (Ptujska ulica 19) and Maribor (Zagrebška cesta 90).

What is VARcert?

The independent and autonomous organisational unit of the Welding Institute that carries out certification.

What accreditations does the Institute have?

LP-003 (testing), CO-003 (certification of personnel) and CP-011 (certification of products, processes and services) from Slovenian Accreditation, and it is EU notified body NB 2042 for pressure equipment.

Who issues the IWE, IWT or IWS diploma?

The Slovenian Welding Society (SDVT) on behalf of the IIW. The Institute runs the programmes as an authorised education body.

How do I contact you?

Call +386 1 28 09 400, write to info@i-var.si or use the enquiry form. We will direct you to the right contact person.

Last updated: 2 November 2026