| 摘要 |
PROBLEM TO BE SOLVED: To provide a forged piece body for a nozzle piece for gas pressure welding, which has a new structure by which a prescribed range including the butt pressure welding surface parts of reinforcing bars to be subjected to gas pressure welding and its vicinity, can be surely heated, a new manufacturing method for the nozzle piece for gas pressure welding using the forged piece body, and a burner for gas pressure welding, which uses the nozzle piece. SOLUTION: This forged piece body 2 is used as a nozzle piece for gas pressure welding, which is constituted as follows, nozzle parts 32, 32 for a reinforcing bar axial center position, are arranged on the upper and lower sides of a center nozzle part 31 arranged in the center by the nozzle surface forming part 3 of a piece main body forming a gas supply path forming part 4 on the backside of the nozzle surface forming part 3. On the left and right of the center nozzle part 31 and the nozzle parts 32, 32 for each reinforcing bar axial center, nozzle parts 33, 33 ... for corresponding to a reinforcing bar diameter are arranged respectively, and groove parts 34, 34 ... for air supply are provided, which have been arranged lengthwise and crosswise around each nozzle surface and have been formed so that the groove parts become communicating shapes up to the outer periphery edge of the piece main body, and on nozzle surfaces, guide recess parts 35, 35 ... for piercing a gas hole are provided.
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