FATIGUE PERFORMANCE OF REPAIRING WELDS AND RESIDUAL STRESS RELIEVING FOR CORNER WELD WITH WELD DEFECTS

Weld defect formation in rail thermite welds

A previously developed heat transfer model is used to study the influence of welding parameters on weld defect development in thermite welds. Weld defect formation maps are constructed from a series of heat transfer simulations. For the current normal rail thermite welding conditions, it is found that shrinkage cavity formation can be avoided but cold-lap and centre-line defects are likely to o...

I / RESIDUAL STRESS DISTRIBUTION IN FeAl WELD OVERLAY ON STEEL

Neutron diffraction was used to measure the residual stress distribution in an FeAl weld overlay on steel. It was found that the residual stresses accumulated during welding were essentially removed by the post-weld heat treatment that was applied to the specimen; most residual stresses in the specimen developed during cooling following the post-weld heat treatment. The experimental data were c...

The Physics of Weld Bead Defects

Examination of Weld Defects by Computed Tomography

Ispitivanje grešaka zavara kompjutorskom tomografi jom. Ispitivane su greške u zavarenom spoju niskougljičnog čelika S235JR debljine 6 mm zavarenog MAG postupkom. Uzorak koji sadrži greške naljepljivanja i pore je ispitivan kompjutorskom tomografi jom KT. Programskom analizom tomografa je određena veličina i pozicija grešaka naljepljivanja kao i dimenzije i raspored pratećih pora u zavarenom sp...

In situ monitoring of weld transformations to control weld residual stresses

The level of residual stresses generated in fusion welds has been a major area of interest for many years. For steels, a major influence on the final state of stress is through martensitic transformation. This is because the martensitic transformation is accompanied by significant shear and volume strains. One way to mitigate the development of residual stress is by controlling the onset of the...