Coating method for pipe having weld bead

Details Coating method for pipe having weld bead Coating method for pipe having weld bead

2007-02-22

2011-10-18

Nguyen, Khanh P (Department: 1746)

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

C156S279000, C156S244270, C156S244120, C156S244130, C156S324400, C156S498000, C427S180000, C427S410000, C427S318000, C427S424000, C427S425000, C427S195000, C427S292000, C427S426000

Reexamination Certificate

active

08038829

ABSTRACT:
Method of coating pipe having a raised weld bead. Curable resin polymer is applied to the pipe and allowed to bond to form a cured or partially cured polymer layer on the pipe. Powder form adhesive composition is applied on the polymer layer while hot, with fusion into a film bonding to the polymer. Powder form polyolefin is applied to the adhesive while hot with fusion into a film bonding to the adhesive to form a powder-based coating. Following forming of the powder-based coating, the pipe is cooled from the inside. An outer polyolefin covering is bonded to the powder-based coating and the pipe cooled to ambient temperature. This procedure can avoid voids, cavities or pinholes forming in the coating adjacent the weld bead.

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