JP2010089104A - Annular body for gas pressure welding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an annular body for gas pressure welding, which serves to safely perform gas pressure welding operation while stabilizing joining strength, and which is obtained at low manufacturing cost. <P>SOLUTION: An annular body 1 is formed in nearly the same shape as the end face w of two steel materials W to be joined and with nearly the same material as the steel materials W, and is of a structure in which a degassing means 2 is provided in the annular body 1. Also, as the annular body 1, it is made by cutting nearly one round portion from a material formed in a shape of a coil spring, and is desirably made to have a degassing means 2 for which a gap is provided in the joining part of the annulus. Further, it is desirable that the cross sectional shape of the annular body 1 is one of a circle, a square, and a lozenge and that the degassing means 2 is one of a slit 21, a hole 22, and a notch 23. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is used when two steel materials such as rebars and rails used in construction sites and civil engineering sites are gas-welded, and in particular, Japanese Patent Application No. 2001-194204 (Patent No. 2001-194204). 3629224) and the like.

  Conventionally, when two steel materials, such as circles and strips, are opposed to each other by gas pressure welding, an annular body that is substantially the same shape as the end surface and annularly formed from the same steel material is sandwiched between the end surfaces to be joined. The idea to be used is the one proposed by the inventor in Japanese Patent Application No. 2001-194204.

However, in Japanese Patent Application No. 2001-194204, since a synthetic resin sheet for wrapping the joint surface in a synthetic resin atmosphere is placed inside the ring body, the sealed space where the synthetic resin is gasified is pressed. In addition, the air inside is appropriately pushed out and removed, and the close contact of the space portion is completed. However, there was a case where a loud sound was generated at this time and a part of the ring body was cut out and jumped out. Therefore, there is a problem in that there is a risk of danger during the gas pressure welding operation and there is a case where a good joint surface may not be obtained.
Japanese Patent Application No. 2001-194204

  An object of the present invention is to provide an annular body for gas pressure welding in which gas pressure welding work can be performed safely and the bonding strength can be stabilized.

  Another object of the present invention is to provide a gas pressure welding ring that can be manufactured at low cost.

  The present invention has been made to solve the above problems, that is, the ring main body is formed of the same shape as the end faces of two opposing steel materials and the same steel material, and the gas is released from the ring main body. The structure is provided with means. The ring body may be formed by cutting approximately one turn from a material formed in the shape of a coil spring, and a gas venting means provided with a gap between the rings. The cross-sectional shape of the ring body is preferably one of a circle, a square, and a rhombus, and the gas venting means is preferably one of a cut, a hole, and a notch groove.

  A ring body (1) is formed of substantially the same shape as the end face (w) of the steel material (W) and substantially the same material as the steel material (W) as in claim 1, and a gas venting means is provided in the ring body (1). (2) is provided, and when this is gas-welded, the ring body (1) is sandwiched between the end faces (w) of the two steel materials (W) to be joined, and a synthetic resin sheet is provided for initial heating. Thereafter, when the synthetic resin sheet for wrapping the joint surface in a synthetic resin atmosphere is pressed into the gasified space, the internal air is appropriately and reliably pushed out by the gas venting means (2) and removed. Thus, the close contact of the space can be reliably completed. For this reason, there is no risk of generating a loud sound when pressing and adhering to a conventional space portion, and there is no risk of part of the ring body (1) jumping out and gas pressure welding work is performed safely. In addition, the bonding strength can be stabilized.

  As in claim 2, the ring body (1) is made by cutting approximately one round from the material formed in the shape of a coil spring, and is provided with a gap (s) at the ring joining portion to provide a gas venting means (2 ), The manufacturing cost can be reduced and the gas venting means (2) can be provided very easily.

  When the cross-sectional shape of the ring main body (1) is formed in a circular shape as shown in claim 3, the portion in contact with the end face (w) is a curved surface, so that the close contact with the end face (w) is faster than the plane, By speeding up the sealing of the space portion, it is possible to suppress the intrusion of oxygen from the outside to a minimum, and the joining result is good. Further, when the cross-sectional shape is formed in a quadrangular shape, the ring body (1) can be easily obtained simply by cutting a cylindrical material that matches the outer shape of a steel material (W) such as a reinforcing bar to a predetermined thickness. . Furthermore, if the cross-sectional shape is formed in a rhombus, the peripheral edges on both sides melt faster than the circular shape to secure a space portion, so there is no risk of air almost flowing from the outer periphery, and the synthetic resin is gasified, A gas advantageous for pressure welding can be filled, and a good joint surface can be formed.

  By making the gas venting means (2) into a cut (21) as shown in claim 4, when the gasified space is pressed and brought into close contact, the internal air is appropriately extruded from the cut (21). As a result, it is possible to surely come out and complete the close contact of the space portion with certainty, and it is possible to easily and accurately provide the cut (21). Moreover, when the gas venting means (2) is made into a hole (22) or a notch groove (23), the gas inside the space is pressed and brought into close contact with the gas in the same manner as the cut (21). As a result of being properly extruded from the cut (21), it can be reliably removed, and the close contact of the space can be reliably completed.

  FIG. 1 and FIG. 2 are diagrams showing an embodiment of the present invention, which will be described based on this figure. (1) has a circular cross-sectional shape, is substantially the same shape as the end faces (w) of two steel materials (W) facing each other and gas-welded, and is formed in an annular shape with the same steel material (W). The thickness of the ring main body (1) varies depending on the size of the steel material (W), but is generally preferably 2 mm to 5 mm. Further, the cross-sectional shape of the ring body (1) may be a quadrangle or rhombus shown in FIG. The cross-sectional shape of the ring body (1) may be a triangle. (2) is a gas venting means provided in the ring body (1), and the gas vent means (2) is preferably provided with a cut (21), a hole (22) or a notch groove (23) (FIG. 3). FIG. 4). Further, as the notch groove (23), a V groove as shown in FIG. 3C or a U-shaped groove as shown in FIG.

  Next, in the case where the product of the present invention is manufactured, the case of manufacturing the product of the present invention, particularly for use in a steel material (W) of rebar will be described. First, an iron wire having a wire diameter corresponding to the size of the steel material (W) is prepared, and is formed by being wound in a coil spring shape so as to be approximately the same size as the outer shape of the steel material (W). About one round is cut from the coil spring, and it is flattened as shown in FIGS. At this time, a gap (s) is provided at the ring joining portion to form the degassing means (2). The gap (s) at this time is preferably in the range of 0.2 mm to 1.5 mm. In particular, it is preferably around 0.3 mm. Moreover, since the said ring main body (1) is used for steel materials (W) of complicated shapes, such as a rail, when manufacturing this invention product, steel materials (W), such as a rail, are annealed, After removing the inside of the steel material (W) while leaving the periphery, the steel material (W) may be cut to a predetermined thickness, or may be manufactured by making a dedicated mold. At this time, a cut (21) is provided in the ring body (1), or a hole (22) is formed, or a notch groove (23) is provided to provide a gas venting means (2).

  Next, a method for attaching the product of the present invention will be described with reference to FIG. First, in the case of (a), the ring holding member used in Japanese Patent Application No. 2008-259430 is used and the product of the present invention is attached. The product of the present invention may be put in, and sandwiched between the end faces (w) of two opposing steel materials (W). In the case of (b) to (d), in the same manner as in Japanese Patent Application No. 2001-194204, the product of the present invention is sandwiched between the end faces (w) of two opposing steel materials (W) and synthesized inside the product of the present invention. A resin sheet may be put in and attached.

  Next, the operation of the present invention will be described with reference to FIG. In Japanese Patent Application Nos. 2001-194204 and 2008-259430, during the initial heating, the outer peripheral edge of the ring body (1) melts and comes into close contact with the outer periphery of the end faces (w), and the synthetic resin burns before that. The gas space is filled with gas as shown in FIGS. 5 (a) and 5 (b) to prevent the oxide composition of the end face (w). If the product of the present invention is used when the internal air is pushed out by pressing, the gas escapes appropriately as shown by the dotted arrows in FIGS. 5A and 5B when the space is pressed. Thus, the gas in the space can be completed and contact can be completed as shown in FIG. For this reason, there is no generation of loud sound that may have occurred in the past, or a part of the ring main body (1) is not cut out. Therefore, if the product of the present invention is used, the gas pressure welding operation can be performed safely and the bonding strength can be stabilized.

  The product of the present invention can sufficiently cope with not only gas pressure welding but also a high frequency induction heating method.

It is a front view which shows embodiment of this invention. It is a top view of FIG. It is explanatory drawing which shows the gas venting means of this embodiment. It is explanatory drawing which shows the attachment state of this invention product. It is explanatory drawing which shows the effect | action of this invention.

Explanation of symbols

1 Ring body 2 Gas venting means
21 breaks
22 holes
23 Notch groove W Steel w End face s Space

Claims (4)

  When the two steel materials (W) are opposed to each other and gas pressure-welded, they are used by being sandwiched between the end surfaces (w) to be joined, and have substantially the same shape as the end surfaces (w) and the steel materials (W A ring body for gas pressure welding characterized in that a ring main body (1) is formed of substantially the same material as that of) and a gas venting means (2) is provided on the ring main body (1).   The ring body (1) is made by cutting approximately one turn from a material formed in the shape of a coil spring, and is provided with the degassing means (2) by providing a gap (s) at the ring joining point. The ring for gas pressure welding according to claim 1.   The annular body for gas pressure welding according to claim 1 or 2, wherein a cross-sectional shape of the ring body (1) is one of a circle, a square, and a rhombus. The gas pressure welding ring according to claim 1, wherein the gas venting means (2) is one of a cut (21), a hole (22), and a notch groove (23).