POLYMERIC REDUCTION MATERIAL FOR GAS PRESSURE WELDING AND GAS PRESSURE WELDING METHOD

WIPO Patent Application WO/2022/123971

A1

[Problem] To provide a polymeric reduction material for gas pressure welding with which, even if propane gas having a lower thermal power than acetylene gas is used to perform gas pressure welding of reinforcing bars or the like, the generation of residue in a pressure welded part can be suppressed and sufficiently strong pressure welding can be achieved, while enabling heating with a standard flame from an initial heating stage such that sufficient thermal power can be obtained. [Solution] A polymeric reduction material A1 for gas pressure welding comprises: a cap body 1 which is a bottomed cylindrical body that is made of a thermoplastic resin and that can be externally fitted to a pressure welding-side end part of a material to be pressure welded; an air blocking ring 2 that is provided integrally with the bottom part 12 of the cap body 1, and that is made of a thermosetting resin and has a required diameter; and a reduction sheet 3 that is made of a thermoplastic resin and has the same diameter as or a larger diameter than the air blocking ring 2, which is sandwiched between the reduction sheet 3 and the bottom part 12 of the cap body 1. A reduction ring 5 made of a polyimide resin is wound around the outer circumferential portion of a layered part of the reduction sheet 3.

MURAYOSHI SEIYU (JP)

PCT/JP2021/040664

June 16, 2022

November 04, 2021

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MURAYOSHI GAS PRESSURE WELDING IND CO LTD (JP)

B23K20/00; B23K20/14

JP2011177780A	2011-09-15
JP2010155271A	2010-07-15
JP2012110936A	2012-06-14
JP2003010983A	2003-01-15

ARIYOSHI Shuichiro et al. (JP)

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