FIELD: thermite welding by means of portable devices of leads of electrochemical protection to main gas- and oil pipelines, grounding leads to large-size constructions.
SUBSTANCE: crucible-mold includes reaction chamber, pouring gate chamber with gate and lid. Thermite mixture and copper membrane are arranged inside crucible-mold. Apparatus is in the form of one-piece, non-detachable and sealed article for disposable use and it is provided with electric igniter. Crucible-mold is made of refractory ceramics on base of high-alumina cement and powdered graphite. Thermite mixture is used as compacted charge containing in upper part layer of easily ignited transition charge. Electric igniter is in the form of thin Nichrome conductor coated with easily ignited composition and it includes two electric wire leads for connecting with actuating ignition device.
EFFECT: lowered labor consumption, improved operating efficiency and safety of welding process, enhanced stability of welding quality.
5 cl, 1 dwg, 1 tbl
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