Abstract Duplex stainless steel has been widely applied to industry. In this paper, nondestructive testing, chemical composition analysis, metallographic hardness test, and scanning electron microscope were used study the causes of crack in butt joint girth weld pipe flange. Both flange are duplex S31803. Through it was judged that a crystalline crack, generated welding process, which related p...

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 ...

Abstract Based on the accumulation situation of anti-spatter spray in actual manufacturing, butt joints are implemented to analyze state changes two types and their effect arc stability, molten pool fluidity, weld performance. The results show that fluidity water-based is significantly better than oil-based welding process, resulting a large near suppression position. This causes strong fluctua...

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 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 ...

Microplasma welding is a less expensive alternative to laser welding in dental technology. The aim of the study was to highlight discontinuities present in the microplasma welded joints of dental base metal alloys by visual analysis. Five base metal alloys designated for fixed prostheses manufacture were selected for the experiments. Using these plates, preliminary tests were conducted by micro...