Thin AZ31 magnesium alloy sheets, i.e., 2 mm thick, are welded by Friction Stir Welding (FSW) in butt joint configuration using gap width up to 1.15 mm. All welds present good surface finishing and no internal defects, except for the weld produced maximum width. A reduction of thickness within Zone is seen with increase width, leading a 8.5%. Microstructure Vickers hardness investigations revea...

The fatigue resistance of welded connections made high strength steel (HSS) is one the most important topics for application HSS in construction sector. One challenging issues how to predict life structures with complex geometry based on test results from relatively simple coupon specimens. However, there are generally pre-existing residual stresses specimens during tests, and these vary greatl...

In this paper, the numerical implicit gradient approach already validated for steel welded joints is also used aluminium joints. Some peculiarities of are discussed and a general fatigue scatter band arc has been proposed. The analysed experimental data taken from literature range simple butt-welded with thickness 2 mm up to extruded I-beam length about m. obtained SN behaviour an inverse slope...

There are a wide range of important applications for metal tube materials in various fields. The production process of high-frequency longitudinally welded pipe includes first using a roller to coil the long steel strips of a certain size into a cylinder shape, and then join them by heating the steel materials at the welding edge with a high-frequency welding machine — Fig. 1. The processes inc...

all the producing and assembling processes exert residual stress on the pieces that may lead to structural failure. therefore, calculating the residual stress in such structures has been common in recent years. in this article, distribution of temperature and residual stress resulting from arc welding in three-pass butt joint in p91 austenitic stainless steel pipes is calculated and estimated u...

In the AiF-FOSTA research project P1020 [1], a new design model for welded joints was developed. this context, small scale test on flat tensile specimens designed, with help of which various influences strength and ductility welds were investigated. Furthermore, extensive tests carried out overlap joints, cruciform double fillet as well partially fully penetrated butt joints. This done to calib...

The development of adaptive and intelligent clamping devices allows for the reduction rejects defects based on weld discontinuities in laser-beam welding. utilization fixture-integrated sensors actuators is a new approach, realizing that enable in-process data acquisition time-dependent adjustment process conditions workpiece position by means closed-loop control. present work focused sensor ac...

In this work, local properties such as hardness and fatigue crack grow rate in the heat-affected zone of four laser-welded butt joints thin high-strength low-alloy steel were examined, so to explain predict lives at high stress levels through fracture mechanics approach. The different welded series presented a similar growth fusion zones, but lower than base metal due higher bainitic–martensiti...