Title:
PRESSURE WELDING JIG FOR REINFORCING BARS
Document Type and Number:
WIPO Patent Application WO/2021/054187
Kind Code:
A1
Abstract:
[Problem] To make it possible, when pressure-welding reinforcing bars, to perform the pressure welding efficiently at a low cost while ensuring reliability of the welding strength between the reinforcing bars and minimizing an increase in the outside diameter of the weld part. [Solution] In a reinforcing bar pressure welding operation, a method is used in which: after a heating step for butting, against each other, mutually facing connection-side end parts of two reinforcing bars B, B held in a coaxial manner and applying heat, and immediately before a pressure-welding step, a C-shaped outside-diameter-restricting part 2 of a pressure-contact jig 1 is fitted around one of the reinforcing bars B from the side of the reinforcing bar B; in the pressure-welding step, welding is performed while restricting an increase in diameter of the weld part at which the two reinforcing bars B, B are welded, with the outside-diameter-restricting part 2 of the pressure-contact jig 1 having been made to slide in the axial direction and being held on the radially outer side of the connection-side end parts of the two reinforcing bars B, B; and after the end of the pressure-welding step, the outside-diameter-restricting part 2 of the pressure-contact jig 1 is made to slide in reverse and detached to the side of one of the reinforcing bars B. It is thereby made possible to perform the pressure welding operation efficiently at a low cost while ensuring reliability of the welding strength between the connected reinforcing bars B, B and minimizing an increase in the outside diameter of the weld part.
Inventors:
HAYASHI NARIYUKI (JP)
Application Number:
PCT/JP2020/033845
Publication Date:
March 25, 2021
Filing Date:
September 07, 2020
Export Citation:
Assignee:
HAYASHI NARIYUKI (JP)
I F PLANNING INC (JP)
I F PLANNING INC (JP)
International Classes:
B23K20/00; E04G21/12
Foreign References:
JP2013066927A | 2013-04-18 | |||
JPH10175080A | 1998-06-30 |
Attorney, Agent or Firm:
TSUTADA, Masato et al. (JP)
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