Space : technologies, materials, structures by B E Paton

By B E Paton

content material: machine generated contents: Chapt. 1. house applied sciences are a truth --
chapt. 2. house as a processing surroundings --
chapt. three. Processing experiments below microgravity --
chapt. four. learn of the magnetosphere of earth --
chapt. five. Large-sized constructions in area --
chapt. 6. way forward for house applied sciences --
chapt. 6. way forward for area technologies.

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Explosion welding and cutting will not be considered in detail in this paper. It should only be noted that the common drawback of the above-mentioned methods is the necessity of careful preparation and fit-up of the objects treated and low flexibility of the process. This limits the capabilities and fields of their application in space. They can be used both in the assembly and also in the repair of the space vehicles. Therefore, since 1965 these methods have been investigated comprehensively at the PWI in the flying laboratory and directly in space.

Miami, pp. 12–24. © 2003 Taylor & Francis 42 Space:Technologies, Materials, Structures Figure 1 Scheme of conductance of main electron beam technological processes: a—heating; b— brazing; c—welding; d—cutting; e—coating deposition; 1—electron gun; 2—electron beam; 3—object to be treated; 4—filler wire; 5—crucible with evaporating material; 6—vapour flow; 7—substrate. Figure 2 Typical phenomena caused by main space factors: 1—factors of space environment; 2— weightlessness; 3—high space vacuum; 4—abrupt light-shade boundaries; 5—absence of gravitation; 6—absence of buoyancy forces; 7—weakened convection; 8—increase in activity of surface phenomena; 9—absence of support reaction; 10—high rate of evacuation of gases and vapours; 11— absence of convection heat exchange with environment; 12—good protection of molten metal; 13— presence of operator’s spacesuit; 14—wide temperature range of workpieces treated (150–500 K); 15— forced thermal control; 16—changing solar illuminination; 17—physical-chemical processes.

2003 Taylor & Francis Space Technologies are a Reality 17 Working station in space simulation test chamber. Below, the «anchor», in which the cosmonaut’s feet are fixsed;VHT with an open sample board is fixed on a flap handrail of a fragment of OS «Salyut-7». convenient work station for the operator-welder, providing all requirements to safety. The cosmonaut-welder is standing on a special foot rest-«anchor», his feet are fixed. The control panel, working tool and sample board are easily accessible.

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