FIELD: metallurgy.
SUBSTANCE: solidifying polymer resin is applied on pipe to facilitate formation of attached solidified or partially solidified polymer layer on pipe. Powder form of glue composition is applied on still hot polymer layer; composition melts and forms film attached to polymer. On still hot glue there is applied powder form of poly-olefine which melts, generates film attached to glue and forms coating on base of powder. Upon formation of coating on base of powder the pipe is cooled from inside. External poly-olefine coating is attached to coating on base of powder and pipe is cooled to temperature of environment.
EFFECT: lack of interstices, cavities and micro-holes in coating adjacent to bead weld.
20 cl, 3 ex, 2 tbl, 17 dwg
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