Welding parameters for pipe joint friction stir welding (FSW) have been identified based on L-9 orthogonal arrays used in the Taguchi Method. Different parameters, such as rotation speed, travel speed and axial force, to produce several quality welded AA6063 butt joints. The reliability of products obtained FSW process can be improved through identification optimum combination parameters. Weld ...

We define an invariant of welded virtual knots from each finite crossed module by considering crossed module invariants of ribbon knotted surfaces which are naturally associated with them. We elucidate that the invariants obtained are non-trivial by calculating explicit examples. We define welded virtual graphs and consider invariants of them defined in a similar way. 2000 Mathematics Subject C...

Abstract A premature pitting corrosion in seam-welded 3-inch L235 steel pipe was reported to occur after 8 years service. This part of a closed ice water cooling system, where the inlet temperature 6 °C and outlet 11 °C. The present work aimed investigate causes this through metallographic investigations. comprised visual examination internal surfaces microstructural examinations perforation re...

Failure investigation was conducted on a bleed air connector of an aircraft engine that developed opening during service. The fabricated tubular structure wherein the flanges were circumferentially welded to bent pipe both ends. and made austenitic stainless steel AISI 321. Fractography study confirmed had failed by fatigue mechanism. Fatigue crack initiated at one weld joints. exact location i...

Steel pipelines in industrial plants consist of different elements, including seamless and/or welded (seam) pipes. Properties pipes, their fracture behaviour, depend on the characteristics both, base metal, and weld metal. In this work, two seam pipes are considered having diameters manufactured P235TR1 steel. Hardness microstructure were examined samples which contained zone, to capture influe...

Abstract There are a lot of welded joints in the shale gas collection pipeline, so failure risk production line is very high. A leak has occurred pipeline dewatering station, and order to find out causes provide technical support for safe transmission, macroscopic analysis, non-destructive testing (X-ray flaw detection), mechanical properties, metallurgical analysis were performed on failed pip...