carbon arc welding
81Materials for use in vacuum — are materials showing very low rate of outgassing in vacuum, and, where applicable, tolerant to the bake out temperatures. The requirements grow increasingly stringent with the desired degree of vacuum achievable in the vacuum chamber. The… …
82Lanthanum — (pronEng|ˈlænθənəm) is a chemical element with the symbol La and atomic number 57. Characteristics Lanthanum is a silvery white metallic element that belongs to group 3 of the periodic table and is a lanthanoid. Found in some rare earth minerals …
83Rare earth element — Rare earth ore, shown with a United States penny for size comparison These rare …
84СВАРКА В УГЛЕКИСЛОМ ГАЗЕ — дуговая сварка, при которой в качестве защитного газа используется углекислый газ (Болгарский язык; Български) заваряване в среда от въглероден двуокис (Чешский язык; Čeština) svařování v kysličníku uhličitém (Немецкий язык; Deutsch) Schutzgas… …
85Portal:Chemistry — Wikipedia portals: Culture Geography Health History Mathematics Natural sciences People Philosophy Religion Society Technology …
86Russia — This article is about the current country. For other uses, see Russia (disambiguation). Russian Federation Российская Федерация Rossiyskaya Federatsiya …
87Transformer types — Circuit symbols Transformer with two windings and iron core. Step down or step up transformer. The symbol shows which winding has more turns, but not usually the …
88Caulking — is a process used to seal the seams in wooden boats or ships, and riveted iron or steel ships, in order to make them watertight. The same term also refers to the application of flexible sealing compounds to close up crevices in buildings against… …
89argon — A non explosive, colorless, odorless, tasteless, inert gaseous element used in electric light bulbs, fluorescent tubes, and neon tubes, and as an inert gas shield in arc welding. Atomic symbol Ar, atomic number 18, atomic weight 39.94, melting …
90helium — A colorless, odorless, tasteless, non explosive, and inert gaseous element. It is used in arc welding and gas discharge lasers, as a component of artificial atmospheres, as a refrigerant, as a lifting gas for balloons. Tank sizes available… …
