„The testing chamber, and the staff's approach and willingness beyond requirements — I can only recommend them.“
Tomáš Matús
Google review
Weld Measurement
In our materials laboratory we provide comprehensive analysis of welds – from sample preparation through hardness measurement to dimensional inspection and mechanical properties. We help reveal the quality, durability and accuracy of welds, which form the basis of structures, machines and critical components. With us you gain the certainty that your welds meet the highest technical requirements.
-
Over 30 years of experiencein the supply & service of testing technology
-
Warranty & post-warranty servicefor our own and competitors' equipment
-
Training of your employeesto increase their expertise
-
Accredited laboratoriesfor external tests and calibrations
Evaluation of welds
Welds can be evaluated in several ways depending on which properties we want to verify. The basic one is visual inspection, which serves to reveal surface defects. Mechanical tests are also used, such as tensile and bend tests, which verify the strength and ductility of the joint. Hardness tests help to determine changes in properties in the area of the weld and the heat-affected zone. Using optical methods, such as macroscopic and microscopic analysis of a section, the internal structure of the weld can be observed and its dimensions accurately measured at the same time. Together, these methods provide a comprehensive picture of the quality of the welded joint.
Metallographic preparation of welds
This includes cutting out and, if necessary, mounting the sample, followed by grinding and polishing the surface. A sample prepared in this way is suitable for microscopic analysis of the weld structure, the heat-affected zone and the base material, or for hardness evaluation.
Hardness measurement of welds
It is carried out using the Vickers or Brinell method on a carefully prepared sample surface. Hardness is measured in various areas – in the weld metal, the heat-affected zone and the base material – so that it is possible to assess the changes caused by the welding process. This method enables fast and accurate evaluation of the mechanical properties of the weld, identification of changes in the material and comparison of different welding technologies.
Optical inspection and dimensional inspection of welds
Microscopic evaluation of a weld serves for a detailed assessment of the internal structure of the weld metal, the heat-affected zone and the base material. Observed, for example, are the size and shape of grains, uniformity of structure, the presence of phases or possible defects such as cracks or inclusions that are not visible to the naked eye.
This analysis may also include dimensional inspection of the weld, in which, for example, the height and width of the weld, the size of the penetration or the bevel angle are measured. This information helps to verify whether the weld was made according to requirements and whether it has the corresponding mechanical properties.
Mechanical tests of welds
Mechanical tests of welds, specifically tensile and bend tests, serve to verify the strength and ductility of a welded joint. In the tensile test the sample is loaded in tension until rupture and the tensile strength, yield strength, elongation and location of fracture are evaluated. The bend test verifies the resistance of the weld to plastic deformation by bending the sample over a mandrel, while observing the formation of cracks or other defects. Both methods are essential for assessing weld quality in structural applications.
We'll be happy to advise you.
Ing. Radek Lovětínský
Head of the testing laboratory
What we test for you
We carry out comprehensive evaluation of welds, which includes hardness measurement in the area of the weld metal and heat-affected zone, optical inspection of sections with assessment of the internal structure and precise measurement of the weld dimensions, and also mechanical tests such as tensile and bend tests, which verify the strength, ductility and overall quality of the welded joint.
Scope of tests
- Hardness measurement of welds using the Vickers and Brinell method
- Optical inspection and dimensional inspection of welds
- Mechanical tests of welds
What We Test for You
Hardness measurement of welds
Test according to standard ČSN EN ISO 9015-2 for samples with high hardness gradients.
Weld dimensions
Measurement of the dimensions of welds according to your internal specifications and standards.
Which standards we test for you
When testing welds, a whole range of technical standards is applied, which set out precise requirements for carrying out individual tests, sample preparation, measurement conditions and the method of evaluating the results. These standards cover both mechanical tests, such as tensile and bend tests, as well as hardness tests and optical analyses. They ensure uniformity and repeatability of results across different laboratories and manufacturers and are key to assessing the quality of welded joints in accordance with requirements for the safety and reliability of structures.
Standards
- ČSN EN ISO 9015-1: Hardness testing of arc welded joints
- ČSN EN ISO 9015-2 Microhardness testing
- ČSN EN ISO 17639 Macroscopic and microscopic examination of welds
- ČSN EN ISO 4136 Transverse tensile test
- ČSN EN ISO 5173 Bend tests
- ČSN EN ISO 5178 Longitudinal tensile test on weld metal in fusion welded joints
How Does It All Work?
-
1
Non-binding inquiry
Tell us your testing requirements (e.g. via the inquiry form, email or phone).
-
2
Consultation & requirements specification
We contact you and clarify the test specification and timeline.
-
3
Price quotation
You receive a structured price quotation from us.
-
4
Ordering
After your order we reserve the date and capacity.
-
5
Delivery of samples
You deliver the samples to us in person or by courier.
-
6
Performing the test
We carry out the test on the reserved date.
-
7
Preparing the test report
After the test we send the test report electronically.
-
8
Follow-up support
We'll gladly go through the test results with you.
Words From Our Clients
„JD Dvořák — a company where the impossible does not exist and where it is not only about work. I am glad to have the honour of working with JD Dvořák.“
Libor Pala
TRL Space Systems s.r.o.
„We have worked with JD Dvořák for a long time in testing, the rental of climatic chambers, and the service and calibration of our equipment. We value the helpfulness and professionalism of the department heads and technicians we are in regular contact with during tests and the work carried out. Our technicians also make use of training in various areas of testing, which provides both an expansion of theoretical knowledge and practical demonstrations.“
Jiri Turek
Google review
„What I greatly appreciate is the personal approach to solving every problem. Whether it concerned specific testing requirements or the need for individual consultation, I was always met with willingness and expert help that led to a smooth and efficient collaboration. For me, JD Dvořák is not only a professional company, but also an excellent partner in research and education.“
„We have worked with JD Dvořák since 2020. Since then we have completed several installations together, and throughout they have provided service and the necessary calibrations, always at the highest professional level. They have also helped us with our special requirements and we can always rely on them. Their approach is not only professional and customer-oriented, but also very human, and the cooperation is always pleasant.“
Jan Špaček
Fresenius Kabi Horatev CZ s.r.o.
„Cooperation with JD Dvořák is at an excellent level, as proven by more than 20 years of trouble-free collaboration.“
Libor Šmíd
TÜV SÜD Czech s.r.o.
„You do good work — thank you for the long-term cooperation.“
Ing. Ivan Vavrík
Bel Power Solutions s.r.o.
„Thank you for the professional cooperation so far. You are a very reliable partner for us.“
Ing. Miloslav Mensinger
Škoda Auto a.s.
Test report
This document contains key information about the tested sample and the course of the test. We provide the report in Czech or English according to your needs.
We issue both an accredited and a non-accredited test report according to customer requirements. The type of report is determined by the chosen testing standard.
- Information about the tested sample
- Place and date of the test
- Equipment used and its calibration status
- Description of the test procedure including laboratory conditions
- Graphical record of the test
- Responsible persons
- Photo documentation of samples before and after the test
Why test with us?
Expertise in the field
Not sure how to test your sample? We'll help. We have years of experience and will recommend the most suitable procedure. And if you already know exactly what you want, we'll be your partner — without unnecessary questions.
Flexibility
Our equipment covers most requirements. If something is missing, thanks to our links with manufacturers of testing technology we can often arrange even specialised equipment outside our laboratory.
Reliability & speed
You can rely on both the equipment and our arrangements. We service and calibrate everything ourselves, so we can react quickly and adapt tests to get you results as soon as possible.
Personal approach
Every job is unique to us. We always try to understand your needs and tailor the service exactly to what you expect.
We'll be happy to advise you.
Ing. Radek Lovětínský
Head of the testing laboratory
Frequently Asked Questions
Most often the tensile and bend tests are used, which verify the strength and ductility of the welded joint.
Hardness tests help to determine changes in properties in the area of the weld and the heat-affected zone, which is important for assessing the quality of the joint.
Most often the Vickers method is used, or Brinell, depending on the material and the required accuracy.
These are optical tests that evaluate the shape, penetration and internal structure of the weld using sections.
Standards ensure uniformity of procedures, accuracy of results and comparability between different laboratories and manufacturers.
Yes, mechanical and hardness tests are destructive, because the sample is damaged or destroyed during testing.
