In this research, the effect of shielded metal arc welding (SMAW) process heat input upon microstructure and development heat-affected zone in dissimilar joint API 5L X80/DS5 2205 steels was investigated by recording thermal cycles with thermocouple implantation perpendicular direction weld line. The filler used (electrode) is DSS 2209. base metals their interfaces at different inputs were usin...

Welding quality control is an important parameter for safe operation of oil and gas pipes, especially for high-strength steel pipes. Size control of welding defect is a bottleneck problem for current pipe construction. As a key part of construction procedure for butt-welding of pipes, pore defects in girth weld is difficult to ignore. A three-dimensional non-linear finite element numerical mode...

Natural gas could become one of the most important and strategic energy source in the years to come, even if the renewable sources growth will play a fundamental role in the “next green power energy”; however natural gas has the chance to assure a continuous and reliable energy supply on a economically viable, long term base span. Potential routes for gas export from giant mid-continental field...

This paper describes research and investigation on programming language used in mobile robot controller development by using mobile communication technologies such as Bluetooth, Infrared, Wireless LAN and Zigbee. We found that most mobile robot controllers have been developed using C/C++. It is because C/C++ has powerful extensions that the unit type information can be added within the language...

Abstract A numerical model of the CentRec® receiver has been developed and validated using measurement data collected during experimental test campaign centrifugal particle system at solar tower Jülich. The used to calculate thermo-optical efficiency a scaled-up 20 MWth for various geometries. cost function deduced was perform techno-economic optimization on an LCOH (levelized heat) basis conce...

This study employs potential-monitoring techniques, cyclic voltammetry tests, alternating current (AC) voltammetry methods, and surface characterization to investigate the AC corrosion of cathodically protected X80 pipeline steel. In a non-passive neutral solution at pH 7.2, a sufficiently negative potential completely protects steel at an AC current density of 100 A/m². In an alkaline solution...

The potentiodynamic polarization test and slow strain rate tensile tests of X80 pipeline steel were performed in 0.5M Na2CO3-1M NaHCO3 solution to study the electrochemical and stress corrosion cracking properties. The results of potentiodynamic polarization test show that there is an obvious stable passive region, about from 0v to 0.8V (SCE), indicating that anodic protection is feasible. The ...