Tests of welded joints
Welding is an important process of joining materials in the production of structures, piping systems, vehicles and many other products. The quality of welding is based on qualified welding personnel and qualified welding procedures. Our laboratory scope of accreditation ensures all the basic destructive testing of welders and welding procedure qualification (WPQR), for example:
- Butt joints of sheets and tubes
- T-butt and fillet joints of sheets and tubes, pipe branch
- Joints of tube in tubesheet
- Resistance spot, seams and projection welds
- Arc stud welds
- Reinforcing steel welds
- Getting started to test plastics welds
We offer a sample form to requirements of tests welds. The form is based on the rules of the standard EN ISO 15614-1 and with minor variation to the specific situation almost covers the entire range of tests. It can be a guide to identify the samples and specify tests. The data in the form header will be written to the test report.
The laboratory is accredited also for ASTM standards and performs testing for qualification according to ASME BPV Code IX.
For the qualification of welders and welding procedures, we cooperate with inspection organizations, in particular:
- DOM ZO 13
- TÜV SÜD Czech, pracoviště Praha, Ústí nad Labem, Plzeň
- Bureau Veritas
- SVV Praha
- Vaněk Welding
And service organizations, in particular:
- AZ Weld Stuchl
- TWS Czech
- Project Welding
During preparing test welds and requiring tests should consider some time-tried experiences.
Hardness test are required only for certain groups of materials, so that must be clearly specify. It must be also noted whether it is single-side (ss) or both-side (bs) weld, because for both-side welds are made three lines of hardness, if fit to thickness of material.
The standard length 350 mm of the welded test plate may not always be sufficient in cases where required tests are beyond the standard specification, for example corrosion tests, combination of process or/and material or/and thickness, impact test under 12 mm thickness, etc.
For impact test shall be given testing temperature, because it is not always possible to determine it from properties of base material and often depends of use of the final product. Interpretation of results for sub-size specimens we comment on website of impact tests.
The standard mandrel diameter for bend tests is 4 x thickness of the specimen. The different mandrel diameter must be specify.
The noted tests represent only a small part of various tests of welds. To specify the tests and required size of test welds (number of tubes), you can contact our specialist.
The price of the tests of welded joint is based on our valid price list.
You must keep in mind, that maximum specimen thickness of the tensile test is 30 mm and for bend test 40 mm. At larger thickness of tested material it will multiply the test number so as to overlap and cover the whole welded thickness.