Application of two-layer shells for formation of common wall is supposed to be prospective for reduction of weight of pipeline structures as well as pressure vessels. Calculation of three single-type pressure vessel structures, having common wall, which is made as two-layer shell, was carried out. At that, analysis was given for applied materials and their combination used for manufacture of internal and external shells of common two-layer wall of three types of pressure vessels considering their strength indices. It is determined that application of the same steel grade in two-layer structure does not result in efficient loading of common wall. Application of material with higher strength characteristics for manufacture of external shell results in efficient loading of their common wall, reduction of its thickness and growth of its internal stresses, i.e. reasonable loading. Considered are the issues of application of mesh-like material for manufacture of external shell as well as usage of high-frequency pressure braze-welding in production of perspective tubular billets, designed for pipelines and high-pressure vessels. Ref. 12, Tables 7, Figures 8.
Considered is the operation of supply system of a single-phase machine for resistance spot welding (RSW) with introducing of scheme of longitudinal compensation of reactive power into the primary circuit of welding transformer. Machines for RSW are characterized by a high consumed power, the significant part of which is a reactive component. This leads to increase in general installed power of working regions and asymmetry of loading phases of supply distribution three-phase mains. It is shown in the work that system with a longitudinal compensator is well interacted with a standard thyristor controller of power of machine and allows keeping a high value of power factor within the range of phase control up to 60°. The application of longitudinal compensation gives technological advantages of spot welding, as the power factor of machine with a compensator depends little on the resistance of welding contact. Therefore the welding of metals in the wide range of specific resistances is possible: from low-carbon steels up to some light alloys and metals with protective coatings. Low cost of additional equipping of existing machines with longitudinal compensator with a simultaneous improvement of their technological properties makes the method of longitudinal compensation challenging for industrial application. 7 Ref., 1 Table, 4 Figures.
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