Weld Mechanics
Division 9.4
With its expertise and unique testing infrastructure, the Weld Mechanics division is dedicated to the study of the material behaviour, taking into account full-scale components.
The emphasis is on the thermal, mechanical, and corrosive loads of welded components during fabrication and in service.
We evaluate the integrity of welded joints at the component scale as well as on laboratory specimens.
Our research activities focus on quantifying the relationships between material and design.
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Fields of expertise
The reliable welding of high-strength steels - indispensable for the energy transition and the installation and operation of modern wind turbines but also for the distribution of green hydrogen via pipelines - is the focus of our activities. We offer component-specific investigations for resource-saving lightweight engineering - such as the optimization of weld repair strategies or heat treatment procedures.
Modern joining processes often stress all tailored high-performance materials to their limits already during welding or additive manufacturing. Residual stress analysis is therefore a key aspect of our activities. In addition, we characterize the adsorption of hydrogen in metallic materials as well as hydrogen-induced degradation utilizing and improving advanced analyzing tools.
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Main activities
We develop test methods for cold and hot crack evaluation and investigate new alloy concepts for welding filler materials to be able to join innovative materials with high quality.
The focus of our Fatigue and Fracture group is the damage-tolerant calculation of metallic components. We develop experimental methods and models for testing and simulating the behaviour of metallic materials under cyclic loading.
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Range of services/technical equipment
- Large-scale test facilities for component weld, mock-ups and full-scale tests applying (GMA-, GTA-, SAW multi wire welding) under defined restraint
- Varestraint/Transvarestraint and CTW hot cracking tests
- 6-axis robot X-ray diffractometer for residual stress and phase analysis on large-scale components and complex geometries
- Infrared camera, pyrometer
- Conduction and induction furnaces for physical simulation of weld microstructures
- Quenching- and deformation dilatometer
- Submerged arc tandem welding portal
- Optical deformation and strain measurement (DIC)
- TEKKEN, CTS, Implant cold cracking tests
- Carrier gas hot extraction and melt extraction (G8 Galileo, G4 Phoenix) with mass spectrometer or heat conductivity detector for hydrogen concentration (ISO 3690) and determination of effective diffusions coefficients
- Determination of oxygen and nitrogen concentrations in metals
- Permeation experiments (hydrogen transport and adsorption following ISO 17081)
- Electrochemical hydrogen charging
- Laser Induced Breakdown Spectroscopy (LIBS) for in situ analysis of concentration of elements during welding
- Heat treatment under shielding gas
- HCF
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Publications of the division
In the database PUBLICA you will find publications by BAM employees.
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Prof. Dr.-Ing. habil. Thomas Kannengießer
