The assessment of beneficial effects of weld geometry modification methods is considered in this paper. Since all these methods significantly increaese weld toe radius, its influence on stress concentration factors is analised. The dependance of theoretical stress concentration factors vs. weld toe radius was determined by using both finite element analisys and photoelasicity method for various...

Weld overlay of piping was first used as a method to repair components of simple configurations which were known to contain cracking. An adequate ultrasonic examination of these geometries can be achieved by using a few conventional search units. Currently the application of pre-emptive weld overlays as a mitigation technique and/or to improve the examination surface condition for more complex ...

To evaluate the fatigue life of Q420C steel welded joints, tests were performed on butt-welded cross-butt-welded joints and cross-fillet-welded joints. The strength S-N curves fitted. Then formation development cracks analyzed by fracture morphology. properties compared with literature data standard curves. results showed that test three types roughly above Moreover, joint was significantly hig...

The use of 7000 aluminum alloys has an important role in future lightweight structures the field mobility due to low density and high strength. However, these can only be fusion welded a limited extent because welding defects rarely prevented. For this reason, investigations are carried out identify most suitable parameters for two processes: laser beam magnetic pulse welding. Herein, is succes...

This study is focused on the performance evaluation of flash-butt-welded rail joints concerning their mechanical strength and fatigue life. Residual stresses created in heat-affected zone were measured effects welding process notch sensitivity behavior weld region experimentally assessed. Aiming at clarifying physical phenomenon behind flash-butt welding, nonlinear transient thermomechanical fi...

Weld residual stress and fracture behavior of 316L electron beam weldments, which are particular interest in power generation industry, were investigated this work. Two butt-weld joints manufactured stainless steel plates 6 mm 25.4 thicknesses. Three complementary methods used to measure the three orthogonal components weld coupons, tests conducted on single edge notched bending specimens extra...

The anisotropic, heterogeneous and coarse granular structures of austenitic stainless steel welds lead to important disturbances of the ultrasonic propagation: beam skewing and splitting, attenuation, backscattering and spurious echoes. These disturbances have been studied by EDF R&D for a few years in order to improve the ultrasonic NDT in nuclear applications. In particular, a methodology for...

The welding task in double-hulled structures in shipyards and in steel-frame structures is hazardous and difficult due to the toxic gas and limited workspace. Therefore, many efforts have been undertaken for automation. The main challenge for automation is the development of a simple and robust seamtracking algorithm that can be applied to a portable welding robot that operates under irregular ...