As one of techniques to improve a penetration depth in gas tungsten arc welding, it has been proposed that carbon dioxide is applied as shielding using double torch. Two types gases can flow independently the torch: inner and outer gas. The purpose this study was clarification behavior establish guideline for controlling oxygen contamination which affects toughness welded part formed by welding...

TORCH is a large-area time-of-flight (ToF) detector, proposed for the Upgrade-II of LHCb experiment. It will provide charged hadron identification over 2–20 GeV/c momentum range, given 9.5 m flight distance from LHC interaction point. To achieve this level performance, 15 ps timing resolution per track required. A prototype module having 1250×660×10 mm3 fused-silica radiator plate and equipped ...

Abstract In a DC plasma spray torch, the plasma-forming gas is most intensively heated and accelerated at cathode arc attachment due to very high electric current density this location. A proper prediction of is, therefore, essential for understanding jet formation operation. However, numerical studies mostly deal with transferred arcs or conventional torches tapered cathodes. study, 3D time-de...