JP7398034B1 - Reducing materials for gas pressure welding, tools for processing the same, and gas pressure welding methods - Google Patents

Abstract

[Problem] When attaching a reducing material for gas pressure welding to the tip of a material to be pressure welded such as steel on the stationary side, the gap between the tip surfaces of each material to be pressure welded is narrow. A reducing material for gas pressure welding that makes gas pressure welding work easier by reducing the complexity of gap adjustment work when the gap between the tip surfaces must be set wide. provide. [Solution] A reducing material A1 for gas pressure welding is made of thermoplastic resin and includes a cap body 1a that can be externally fitted onto the tip of the pressure welding side of the material to be pressure welded. A cut edge 120 is provided along the top plate 11 of the cap body 1a with a predetermined thickness and a width that allows it to be fitted into the press-welded material in the circumferential direction, and following the cut edge 120, the remaining thickness of the body 10 is Cut edges 122 and 123 are provided approximately at right angles to the top plate 11 up to the hem end, thereby forming a fitting opening 12. [Selection diagram] Figure 1

Description

The present invention relates to a reducing material for gas pressure welding, a tool for processing the same, and a gas pressure welding method. In detail, when attaching the reducing material for gas pressure welding to the tip of the pressure welded material, it is possible to attach it to the tip of the pressure welded material in a state where the gap between the tip surfaces of each pressure welded material is narrow. Reducing materials for gas pressure welding, tools for processing the gas, and gas welding materials that make it easier to perform gas pressure welding work by reducing the complexity of gap adjustment work when the gap between surfaces must be set wide. Regarding pressure welding method.

For pressure welding of steel materials such as reinforcing bars, two steel materials arranged vertically or horizontally are brought into contact with their end surfaces with a common center axis, and then a predetermined pressure is applied to the movable steel material to reach the upper limit. When the pressure reaches , the area around the abutting part is heated with a gas flame, and when the temperature of the heated part reaches a temperature at which plastic deformation occurs, the pressure welding part deforms thickly and a so-called bump is formed.

Further, in pressure welding of steel materials, in many cases, a reducing agent for gas pressure welding is used in order to achieve stronger pressure welding. A reducing agent for gas pressure welding is used by sandwiching it between the end faces to be joined or disposing it near the end faces when two steel materials are faced to each other and gas pressure welded, and is used, for example, as shown in Patent Document 1. There is a ``ring body holding member with a built-in ring body for gas pressure welding''.

This ring body holding member includes a ring body that has substantially the same shape as the end face, is made of substantially the same material as steel, and has a gas vent, a protrusion portion that has a ring installation space on the bottom side in which the ring body is accommodated, and A holding container made of synthetic resin has a convex portion for connecting and attaching in contact with the outer shape of the steel material, and a lid body made of synthetic resin that is attached to the ring body installation space of the holding container and stops the rotation of the ring body. Be prepared.

The conventional ring body holding member has this configuration, and by stopping the rotation of the ring body with a lid inside the holding container, the position of the gas venting part can be reliably set at a predetermined position, and the ring body can be fixed. This makes it possible to perform the setting work on the edge of the steel material extremely easily and safely.

Japanese Patent Application Publication No. 2011-177780

However, as shown in Fig. 1, etc., this ring holding member has a holding container made of a thin synthetic resin sheet and is lightweight as a whole, so it is difficult to use when working outdoors. A sudden strong wind may cause it to come off the tip of the steel material and be blown away. Alternatively, when an operator works around the abutting portion of the steel material, the operator may accidentally catch the glove on the ring holding member and take it off.

Specifically, conventionally, when press-welding steel materials using a ring holding member, first the gap between the tip surfaces of the steel material on the fixed side and the steel material on the movable side is adjusted using the holding container of the ring body holding member. The distance is set to be equal to the height so that it can pass through. When setting the ring body holding member, insert the ring body holding member through the gap between the tip surfaces of each steel member, attach it to the tip of the steel member on the fixed side, and insert the ring body holding member in order to sandwich the bottom of the ring body holding member. The hydraulic cylinder of the pressure welding machine brings the tip end surface of the movable steel material closer to the tip end surface of the fixed steel material.

However, at this timing, if the wind blows strongly or if the worker touches it, the ring holding member may come off the tip of the steel material, pass through the gap, and fall. In this case, even after the ring holding member passes through the gap, the steel on the movable side moves toward the steel on the fixed side, so its tip surface hits the tip surface of the steel on the fixed side, and there is no gap between the tip surfaces. Become.

In order to reattach the ring holding member to the tip of the steel on the fixed side, move the steel on the movable side from the position where it is in contact with the tip of the steel on the fixed side to its original position again. The ring body holding member must be passed through the gap in the tip, and the steel material must be temporarily fixed in that position. The task of ensuring a gap between the tip surfaces of each steel material is a very time-consuming and troublesome task, especially when the gap is large, which increases the workload.

The present invention was devised in view of the above points, and when attaching the reducing material for gas pressure welding (ring body holding member) to the tip of the material to be pressure welded (steel material), the tip of each material to be pressure welded (steel material) By making it possible to attach the material to be pressure welded to the tip with a narrow gap between the surfaces, it reduces the complexity of adjusting the gap when the gap between the tip surfaces must be set wide. It is an object of the present invention to provide a reducing material for gas pressure welding, a tool for processing the same, and a gas pressure welding method that can easily perform gas pressure welding work.

[1] In order to achieve the above object, the present invention includes a resin cap body that can be externally fitted onto the tip of the pressure welded material, and the body of the cap body is provided with the pressure welded material. This is a reducing material for gas pressure welding that has a fitting opening that can be fitted from the side.

The resin cap body can be externally fitted onto the tip of a press-welded material such as a steel material. Since the cap body has a certain degree of deformability and flexibility, it can be easily attached to the material to be pressed by external fitting, and if the dimensions are set appropriately, it will remain in that state even after attachment. It is possible to maintain

In addition, since the body of the cap body is formed with a fitting opening that can be fitted into the material to be pressure welded from the side, the reducing material for gas pressure welding can be used even if the gap at the tip of the material to be pressure welded is narrow. It can be attached to the pressure welded material by fitting it from the side. Note that even if the gap at the tip of the pressure-welded material is wide, it can be attached to the tip and used as a reducing agent.

[2] In the reducing material for gas pressure welding of the present invention, the fitting opening portion has a cut edge with a width that allows it to be fitted from the side into the material to be pressure welded in the circumferential direction with a predetermined thickness along the top of the cap body. Continuing from the cut edge, a cut edge is formed in the remaining thickness of the body at a predetermined angle to the top or in a predetermined shape up to the hem end. It can also be configured.

In this case, the reducing material for gas pressure welding should cover the thickness of the top if the end face (pressure contact surface) on the pressure welding side of each material to be pressure welded is at least as open as the thickness of the top of the cap body. Insert it into the gap between the tip faces of each material to be pressure welded, and fit the fitting opening formed by the cut edge, which extends from the part along the top to the bottom end, into the side surface of the tip of the material to be pressure welded. , it can be attached to the tip of the material to be pressure welded. At this time, the reducing material for gas pressure welding can be installed by simply widening the gap to a width equivalent to the thickness of the top of the cap body, which is significantly thinner than the entire thickness of the cap body.

[3] In order to achieve the above object, the present invention includes a resin cap body that can be externally fitted onto the tip of the pressure welded material, and a detachable cap body is provided on the body of the cap body. The line of weakness is a reducing material for gas pressure welding, which is provided so as to be able to form a fitting opening that can be fitted into the pressure welding material from the side.

The resin cap body can be externally fitted onto the tip end of the pressure-welded material such as steel material on the pressure-welding side. Since the cap body has a certain degree of deformability and flexibility, it can be easily attached to the material to be pressed by external fitting, and if the dimensions are set appropriately, it will remain in that state even after attachment. It is possible to maintain

In addition, the body of the cap body is provided with a line of weakness that can be cut off to form a fitting opening that can be fitted from the side into the material to be pressure-welded. By removing it, a fitting opening can be formed. As a result, unlike the original form, the reducing material for gas pressure welding has a fitting opening in the body, so it can have the same effect as the reducing material for gas pressure welding described in [1] above.

[4] In the reducing material for gas pressure welding of the present invention, the line of weakness has a width that allows it to be fitted into the material to be pressure welded from the side in a circumferential direction along the top of the cap body with a predetermined thickness, and continues therefrom. The remaining thickness of the body may be provided at a predetermined angle with respect to the top or in a predetermined shape up to the hem end.

In this case, the line of weakness should have a width that allows it to be fitted into the pressure-welded material in the circumferential direction at a predetermined thickness along the top of the cap body, and then in the remaining thickness of the body. It is provided so that it is possible to form a fitting opening portion which is cut out at a predetermined angle or in a predetermined shape up to the end of the hem.

As a result, if you separate the part of the predetermined thickness along the top of the line of weakness and the remaining thickness of the body and remove the unnecessary part, it will fit from the part along the top to the end of the hem of the body. An entrance portion can be formed. As a result, unlike the original form, the reducing material for gas pressure welding has a fitting opening in the body, so it can have the same effect as the reducing material for gas pressure welding described in [1] above.

[5] In the reducing material for gas pressure welding of the present invention, the line of weakness has a width that allows it to be fitted into the material to be pressure welded from the side in the circumferential direction with a predetermined thickness substantially parallel to the top of the cap body, It is also possible to have a substantially T-shaped configuration that connects to the middle part and can be cut off to the end of the hem to form an opening/closing opening that can open and close the trunk.

In this case, the line of weakness is approximately parallel to the top of the cap body, has a predetermined thickness, has a width that allows it to be fitted into the press-welded material in the circumferential direction, and connects to the middle part of the line, and is cut off to the bottom end. The body is provided in a substantially T-shape capable of forming an opening/closing opening for opening and closing the body.

As a result, in the reducing material for gas pressure welding of the present invention, a part of a predetermined thickness parallel to the top of the line of weakness and a part that connects to the middle part and can be separated up to the bottom end are separated. By opening the two formed opening/closing pieces outward or inward, an opening/closing opening can be formed from the part along the top to the hem end of the trunk, unlike the original form.

In the gas pressure welding method using this reducing material for gas pressure welding, an opening/closing piece is opened to form an opening/closing opening in the cap body. Then, insert the thick part of the top into the gap between the tip surfaces of the materials to be pressure welded. Along with this, the opening/closing opening that extends from the part along the top to the end of the hem can be fitted into the side of the tip of the pressure welded material on the fixed side, so the top can be dropped into the tip of the pressure welded material. If so, it can be installed.

[6] The reducing material for gas pressure welding of the present invention includes a second cap body made of resin that can be externally fitted onto the tip of the material to be pressure welded, and the second cap body has a body that It may also be configured such that it is stacked on the cap body in a state where at least a portion of the fitting opening portion is closed.

In this case, the reducing material for gas pressure welding is provided with a second cap body made of resin that can be externally fitted onto the tip of the pressure welded material, and the second cap body has a body portion that is connected to the above-mentioned fitting body. It has a structure in which it is stacked on the cap body so as to close at least a portion of the inlet.

First, the reducing material for gas pressure welding should not be used in its double structure if the tip surfaces of the pressure welded materials are narrower than the height of the cap body. Before sandwiching the top of the cap body of the reducing material for gas pressure welding between the tip surfaces of each material to be pressure welded, that is, when the gap is wide, when placing the reducing material for gas pressure welding on the tip of the material to be pressure welded, take two steps. It can be covered with a heavy structure. As a result, even if some wind blows before the top of the cap body is pinched, the reducing material for gas pressure welding will come off the tip of the material to be pressure welded due to the action of the deep body of the second cap body. Hateful.

If the reducing material for gas pressure welding does not come off by the time the top of the cap body of the reducing material for gas pressure welding is pinched between the tip surfaces of each material to be pressure welded, then It can be used as a reducing material as is. In addition, since the top of the cap body of the reducing material for gas pressure welding is also double-layered, a positive effect on the effectiveness as a reducing material can be expected.

In addition, if the reducing material for gas pressure welding has come off before the top of the cap body of the reducing material for gas pressure welding is pinched between the tip surfaces of each material to be pressure welded, the second reducing material for gas pressure welding that has come off should be removed. A reducing material for gas pressure welding having a fitting opening in the cap body is removed from the cap body, and only this reducing material for gas pressure welding is used as a reducing material. The action at that time is the same as that of the reducing material for gas pressure welding in [1] above, so it will be referred to here and the explanation will be omitted.

Note that the second cap body can be used as a single reducing material for gas pressure welding even after removing the reducing material for gas pressure welding that has a fitting opening in the cap body, so it can be used, for example, as a regular bottomed cylinder. It can also be reused as a reducing material for gas pressure welding, or as a part of this double-structured reducing material for gas pressure welding.

[7] The reducing material for gas pressure welding of the present invention has a structure including a ring body made of resin or metal that is provided on the top of the cap body and melts at a higher temperature than the resin material forming the top. You can also.

In this case, a ring body made of resin or metal is provided on the top of the cap body and melts at a higher temperature than the resin material that makes up the top, so it is heated with a gas flame during pressure welding work. As a result, the top of the resin cap body first melts and burns.

Then, inside the ring body, which has not yet melted, in the small gap between the tip surfaces of the welded material, the top part melts in a very short time, burns, and further vaporizes, causing the volume to rapidly increase. As the pressure increases, the air that was in the gap inside the ring body is pushed out under high pressure, and the oxygen in the air combines with the carbon in the polymer to become carbon dioxide gas, suppressing oxidation around the pressure welding part. Ru.

In addition, while the ring body is not melted, air infiltration into the gap inside the ring body is blocked, and oxidation within the gap is suppressed, causing an oxide film to form on the tip surface on the pressure welding side. This can be prevented from occurring.

As described above, the reducing material for gas pressure welding provides sufficient thermal power when using natural gas, propane gas, hydrogen gas, etc., which have lower thermal power than acetylene gas, when performing gas pressure welding of materials to be pressure welded. Even if heated with a standard flame from the initial heating stage as shown in FIG.

[8] In order to achieve the above-mentioned object, the present invention processes the body of a resin cap body that can be externally fitted onto the tip of the material to be pressure welded, so that the side surface of the material to be pressure welded is attached to the cap body. A processing tool for forming a fitting opening into which the socket can be fitted, the tool includes a base member having a receiver, and a rocking tool that urges the base member to close toward the base member with a spring at one end. It includes a movably attached seesaw member, a cutting blade of a predetermined shape that cuts out the insertion opening provided on the seesaw member, and a blade groove provided on the receiver in which the cutting blade fits. It is a processing tool.

The processing tool of the present invention opens one end of the seesaw member provided with the cutting blade, and connects the body of the resin cap body to the receiver of the base member inserted inside the cap body and the outside of the body. One end of the seesaw member located at is closed using the biasing force of the spring. As a result, the body of the cap body is cut by the cutting blade, and the cutting blade fits into the blade groove.

If the trunk is not sufficiently cut, the receiver of the base member and one end of the seesaw member are pressed in a direction toward each other, and the cutting blade cuts the trunk and fits into the blade groove. Thereby, the body part of the cap body can be cut to produce a reducing material for gas pressure welding in which the body part is provided with a fitting opening.

[9] In order to achieve the above object, the present invention provides a pressure-welded material whose distal end surface is disposed facing the distal end surface of the other pressure-welded material with a predetermined gap therebetween, and which is provided with a step of externally fitting and attaching a resin cap body having a large height to the tip of the one pressure welding material by fitting it from the side of the one pressure welding material; This is a gas pressure welding method comprising the step of abutting the tip surfaces of the one pressure welding material and the other pressure welding material against each other in the attached state and heating them.

According to the gas pressure welding method of the present invention, a resin cap body having a height greater than the gap is attached to one pressure welding material that is disposed facing the tip end face of the other pressure welding material with a predetermined gap in between. Since it is fitted from the side surface of one of the pressure-welded materials, even if the gap is narrower than the height of the cap body, it can be externally fitted and attached to the tip of one of the pressure-welded materials.

As a result, for example, when reinstalling (reinstalling) the reducing material for gas pressure welding in the gap between the tip surfaces of each material to be pressure welded, the gap between the tip surfaces of each material to be pressure welded, such as steel, can be widened and complicated adjustments can be made. There is no need to do this, and the reducing material for gas pressure welding can be attached from the side of the material to be pressure welded, which greatly reduces the complexity of the work, making gas pressure welding work easier as a result. .

By abutting and heating the tip surfaces of one material to be pressure-welded and the other material to be pressure-welded, firm pressure welding can be performed while suppressing the formation of an oxide film on the tip surfaces. In other words, the top of the resin cap body melts in a very short time in the small gap between the tip surfaces of each pressure welding material, burns, and further vaporizes, resulting in a rapid increase in volume. As a result, the air is pushed out under high pressure, and the oxygen in the air combines with the carbon of the polymer to become carbon dioxide gas, suppressing oxidation around the pressure welding part.

[10] In the gas pressure welding method of the present invention, in order to enable the cap body to be fitted from the side surface of the one material to be pressure welded, a fitting opening is provided in the body of the cap body prior to the mounting step. The method may also include a step of forming a section.

In this case, a fitting opening is formed in the body of the cap body prior to the mounting process so that the cap body can be fitted from the side of one of the materials to be pressure welded. Since it is possible to prepare in advance a reducing material for gas pressure welding having a cap body having a fitting opening portion that matches the shape of the material to be pressure welded, the pressure welding work can be performed efficiently.

The present invention makes it possible to attach the reducing material for gas pressure welding to the tip of the pressure welded material when the gap between the tip surfaces of each pressure welded material is narrow. , a reducing material for gas pressure welding and a tool for its processing, which allows gas pressure welding work to be easily performed by reducing the complexity of gap adjustment work when the gap between the tip surfaces must be set wide. and gas pressure welding method.

It is an explanatory view showing an embodiment of type A of the reducing material for gas pressure welding according to the present invention. FIG. 2 is an explanatory diagram showing a B-type embodiment of the reducing material for gas pressure welding according to the present invention. FIG. 2 is an explanatory diagram showing a C type embodiment of the reducing material for gas pressure welding according to the present invention. FIG. 3 is an explanatory diagram showing one method of mounting an A type embodiment of the reducing material for gas pressure welding. FIG. 3 is an explanatory diagram showing one method of mounting a B-type embodiment of the reducing material for gas pressure welding. It is an explanatory view showing a method of mounting a C type embodiment of a reducing material for gas pressure welding. FIG. 3 is an explanatory diagram showing a modification of the reducing material for gas pressure welding, in which (a) is a perspective view of the reducing material for gas pressure welding, and (b) is a sectional view taken along line AA of the reducing material for gas pressure welding. An embodiment of the processing tool of the present invention is shown, with (a) being a perspective view and (b) being a longitudinal sectional view. FIG. 7A is an explanatory cross-sectional view showing how to use the processing tool, and FIG. 3B is an explanatory view showing a cutting line in the cap body.

Embodiments of the present invention will be described in further detail with reference to FIGS. 1 to 9. In the following description of the reducing material for gas pressure welding, it will be divided into three types (A, B, and C). Type A has a fitting opening in advance, Type B has a line of weakness so that a fitting opening and an opening/closing opening can be formed, and Type C has a fitting opening in advance. It is made by stacking a bottomed cylindrical cap body.

(A type)
The reducing material A1 for gas pressure welding shown in FIG. 1(a) has a cap body 1a. The cap body 1a is made of a sheet made of polystyrene resin, which is a thermoplastic resin. The body part 10 (cylindrical part) of the cap body 1a is machined from a cylindrical base with a slightly wider hem, and as shown in FIG. 1(a), the upper end is closed with a circular top plate 11. There is.

In addition, a cutting edge 120 is provided in the circumferential direction along the top plate 11 so as to have a predetermined thickness on the body portion 10, and has a width that can be fitted into a pressurized material 91 (see FIGS. 4 to 6), which will be described later. It is being The thick portion formed by the cutting edge 120 and the top plate 11 has a partially cylindrical shape, and this portion also serves as a fitting portion 121 that prevents falling off when externally fitted onto the tip of the press-welded material 91.

Continuing from both ends of the cut edge 120, cut edges 122 and 123 are provided in the remaining thickness (height) portion of the body 10, respectively, in a direction approximately perpendicular to the top plate 11, so that the cut edge is A letter-shaped fitting opening 12 is formed. A flange portion 13 having a slightly larger diameter is provided at the hem portion of the cap body 1a over the entire length.

Note that the central angle between the cutting edge 122 and the cutting edge 123 (opening angle of the fitting port 12) in a plan view of the reducing material A1 for gas pressure welding is 150° in this embodiment, but it is not limited to this. isn't it. The central angle only needs to be able to fit at least the cutting edge portion of the fitting opening 12 into the pressurized material 91, and is preferably an angle smaller than 180° so that the state can be maintained after fitting. (See Figure 1(b)).

The reducing material A2 for gas pressure welding shown in FIG. 1(c) has a cap body 1c. The cap body 1c is made of a sheet made of polystyrene resin, which is a thermoplastic resin. The body portion 10c of the cap body 1c is machined from a cylindrical base with a slightly wider hem, and its upper end is covered with a circular top plate 11 as shown in FIG. 1(c).

Further, the body portion 10c is provided with a cut edge 124 in the circumferential direction along the top plate 11 so as to have a predetermined thickness and have a width that can be fitted into a pressurized material 91, which will be described later. The thick portion formed by the cutting edge 124 and the top plate 11 has a partially cylindrical shape, and this portion also serves as a fitting portion 125 that prevents falling off when externally fitted onto the tip of the press-welded material 91.

Subsequently to both ends of the cutting edges 124, symmetrical substantially S-shaped cutting edges 126 and 127 are provided in the remaining thickness (height) portion of the body 10c, respectively, with respect to the top plate 11. A fitting opening portion 12c is formed therein. A flange portion 13 having a slightly larger diameter is provided at the hem portion of the cap body 1c over the entire length. Note that the substantially S-shaped cut edges 126 and 127 have a structure in which the side closer to the hem protrudes in a direction that narrows the fitting portion 12c, and holding portions 128 and 129 are formed.

(effect)
Here, with reference to FIG. 1(a) and FIG. 4, a gas pressure welding method and operation using the above-mentioned reducing material A1 for gas pressure welding, which is one of A type, will be explained.

The cap body 1a of the reducing material A1 for gas pressure welding can be externally fitted onto the tip of the pressure welding side (pressure surface 910 side) of the material 91 to be pressure welded such as steel material. The cap body 1a is made of thermoplastic resin and has a predetermined deformability and flexibility, so that it can be easily attached to the tip of the pressure-welded material 91 by external fitting. It is possible to maintain this state afterward.

The pressurized material 91 (and 92 described below) is made of steel such as deformed reinforcing bars and round steel, such as deformed steel bars (SD295A, SD295B, SD345, SD390, SD490) specified by steel bars for reinforced concrete (JIS G3112), In addition to round steel (SR235, SR295) or high-strength reinforcing bars (USD385A, USD385B, USD980), it is also possible to use stainless steel reinforcing bars with increased durability and corrosion resistance (SUS316, SUS304, etc.).

When performing gas pressure welding of the pressure welding materials 91 and 92, first, the pressure welding material 91 on the fixed side is held vertically at a predetermined height using a fixed clamp (not shown). Further, the pressurized member 92 on the movable side is held vertically by a movable clamp (not shown). Note that the press-welded materials 91 and 92 are adjusted so that their center lines are on the same straight line, and the press-contact surfaces 910 and 920 of the press-welded materials 91 and 92 are set at appropriate intervals. Note that the press-welding work may be performed while holding the press-welded materials 91 and 92 in a horizontal direction.

The cap body 1a of the reducing material A1 for gas pressure welding has a fitting opening 12 formed at the cut edge from the part along the top plate 11 to the hem end in the body part 10, so that the parts to be welded under pressure 91, 92 can be welded under pressure. If the pressure contact surfaces 910 and 920 are open to at least the same extent as the thickness of the top of the cap body 1a, it can be attached to the tip of the fixed side pressure contact member 91.

That is, first, the thick portion of the top is inserted horizontally into the gap between the pressure contact surfaces 910 and 920 of the pressure contact materials 91 and 92. Note that the top part may be tilted or inserted in an inclined direction instead of horizontally. Along with this, the fitting opening 12 that extends from the part along the top to the bottom edge is fitted into the side surface of the tip of the press-welded material 91 on the fixed side, so that when the top is dropped onto the press-welded surface 910, the It can be attached to the tip of the pressure contact material 91 (see FIG. 4(a)). Note that this installation by dropping means that the pressure contact surface 910 is not only located above the insertion opening 12 (closer to the top of the insertion opening 12 or at the top), but also located below the insertion opening 12. It may also be done as follows.

With the reducing material A1 for gas pressure welding attached as described above, the pressure welding material 92 is lowered, and the top plate 11 of the cap body 1a is sandwiched between the pressure contact surfaces 910 and 920. By being heated together with the pressure-welded materials 91 and 92 by a gas flame, it is possible to firmly perform pressure-welding while suppressing the formation of an oxide film on the pressure-welding surfaces 910 and 920.

In other words, the top part of the thermoplastic resin cap body melts in a very short time in the small gap between the tip surfaces of each pressure welding material, burns, and further vaporizes, causing the volume to rapidly increase. As the pressure increases, the air is pushed out at a high pressure, and the oxygen in the air combines with the carbon of the polymer to become carbon dioxide gas, suppressing oxidation around the pressure welding part.

Further, according to the reducing material A1 for gas pressure welding, for example, if the reducing material A1 for gas pressure welding comes off before closing the pressure welding surfaces 910 and 920 of each material to be pressure welded, the reducing material A1 for gas pressure welding must be reinstalled. Although necessary, there is no need to make complicated adjustments by widening the gap between the pressure contact surfaces 910 and 920 of the pressure contact materials 91 and 92 (see FIG. 4(a)).

If the cap body is not provided with a fitting opening like the reducing material D for gas pressure welding shown in FIG. 4(b), in order to insert the reducing material D for gas pressure welding into the gap, It must be adjusted to be at least a height h higher than the pressure contact surface 910 shown in a). The task of securing a gap between the pressure contact surfaces 910 and 920 of the pressure contact materials 91 and 92 is a very time-consuming and troublesome task, especially when the gap is large and increases the work load.

On the other hand, with the reducing material A1 for gas pressure welding, the reducing material A1 for gas pressure welding can be used simply by spreading it into a gap with a width equivalent to the thickness of the top of the cap body 1a, which is significantly thinner than the entire thickness of the cap body 1a. It becomes possible to install A1. As a result, the complexity of the work can be greatly reduced, and as a result, the gas pressure welding work can be performed easily.

Note that when the reducing material A2 for gas pressure welding is attached to the material 91 to be pressure welded, the holding parts 128 and 129 grip the material 91 to be pressure welded so as to wrap around the material 91 slightly, so that the reducing material A2 for gas pressure welding does not come off. Excellent holding power. The other functions are the same as those of the reducing agent A1 for gas pressure welding, so the explanation will be omitted here.

(B type)
The reducing material B1 for gas pressure welding shown in FIG. 2(a) has a cap body 2a. The cap body 2a is made of a sheet made of polystyrene resin, which is a thermoplastic resin. The body 20a of the cap body 2a has a cylindrical shape with a slightly wider bottom, and its upper end is covered with a circular top plate 21 in FIG. 2(a).

The body portion 20a is provided with a line of weakness 22a that can be separated by tearing. The line of weakness 22a has a perforation 220 in the circumferential direction along the top plate 21 so as to have a predetermined thickness, and has a width that can be fitted into the press-welded material 91. The thick part formed by the perforation 220 and the top plate 21 has a partially cylindrical shape, and this part also prevents it from falling off when it is externally fitted onto the tip of the press-welded material 91 after separating the separation piece 200, which will be described later. This becomes a fitting part 221.

Continuing from both ends of the perforation 220, perforations 222 and 223 are formed in a U-shape in the remaining thickness (height) portion of the body 20a in a direction approximately perpendicular to the top plate 21 up to the hem end. It is formed in At both end corners of the perforation 220, circular holes 229 are provided to prevent excessive cutting during cutting. Note that the hole 229 may have another shape such as a rectangle.

Further, a flange portion 23a having a slightly larger diameter is provided at the hem portion of the cap body 2a over the entire circumference. Note that by cutting at the perforations 220, 222, and 223, the separation piece 200 can be separated to form a fitting opening similar to the fitting opening 12 of the reducing material A1 for gas pressure welding.

The reducing material B2 for gas pressure welding shown in FIG. 2(b) has a cap body 2b. The cap body 2b is made of a sheet made of polystyrene resin, which is a thermoplastic resin. The body 20b of the cap body 2b has a cylindrical shape with a slightly widened bottom, and its upper end is covered with a circular top plate 21 in FIG. 2(b).

The body portion 20b is provided with a line of weakness 22b that can be separated by tearing. The line of weakness 22b has a perforation 224 in the circumferential direction along the top plate 21 to a predetermined thickness with a width that allows it to be fitted into the press-welded material 91, and continues from the middle part of the perforation 224 to the body part. A perforation 225 is provided in the remaining thickness (height) portion of the top plate 21 in a direction substantially perpendicular to the top plate 21 up to the hem end, forming a substantially T-shape.

When separated at the perforations 224 and 225, opening and closing pieces 226 and 227 can be formed, and the thick portion formed by the perforation 224 and the top plate 21 has a partially cylindrical shape. This portion becomes a fitting portion 228 that prevents falling off when externally fitted onto the tip of the pressurized material 91.

Further, a flange portion 23b having a slightly larger diameter is provided at the hem portion of the cap body 2b over the entire circumference. Note that by cutting at the perforations 224 and 225, the opening/closing pieces 226, 227 can be opened and closed, and an opening/closing opening (not shown) can be formed by opening them.

Note that in this embodiment, perforations are used as lines of weakness, but the invention is not limited to this. For example, a structure in which short slits are provided in an intermittent linear manner, or a structure in which the sheet is made extremely thin may be used. Any structure that can be easily broken by hand, such as a linear structure, may be used.

(effect)
Here, with reference to FIGS. 2(a) and 5, a gas pressure welding method and operation using the above-mentioned reducing material B1 for gas pressure welding, which is one of the B types, will be described.

The cap body 2a of the reducing material B1 for gas pressure welding can be externally fitted onto the tip of the pressure welding side (pressure surface 910 side) of the pressure welding material 91 such as steel material. The cap body 2a is made of thermoplastic resin and has a predetermined deformability and flexibility, so it can be easily attached to the tip of the pressurized material 91 by external fitting. It is possible to maintain this state afterward.

When performing gas pressure welding of the pressure welding materials 91 and 92, the fixed side pressure welding material 91 and the movable side pressure welding material 92 are set in the same manner as in the case of the pressure welding work using the reducing material A1 for gas pressure welding. do. For example, when it becomes necessary to install the reducing material B1 for gas pressure welding again, the cap body 2a is cut at the perforations 220, 222, and 223, and the unnecessary part 200 is separated and fitted. A reducing material B11 for gas pressure welding having an opening 24 (see FIG. 5) can be produced.

The method of use and operation of the reducing material B11 for gas pressure welding after forming the fitting opening 24 in the cap body 2a are the same as those of the reducing material A1 for gas pressure welding described above. Note that if the reducing material B1 for gas pressure welding comes off before closing the pressure contact surfaces 910 and 920 of each material to be pressure welded, it is necessary to reinstall the reducing material B1 for gas pressure welding. .

At that time, there is no need to greatly widen the gap between the pressure contact surfaces 910 and 920 of the press contact materials 91 and 92, and the gap has a width equivalent to the thickness of the top of the cap body 2a, which is significantly thinner than the entire thickness of the cap body 2a. This is similar to the above-mentioned reducing material A1 for gas pressure welding in that the reducing material B1 for gas pressure welding can be attached by simply spreading it out.

In the case of the reducing material B2 for gas pressure welding, after the pressure welding materials 91 and 92 have been set, for example, when it becomes necessary to reinstall the reducing material B2 for gas pressure welding, the cap body 2b is cut at the perforations 224 and 225. By cutting, the opening/closing pieces 226, 227 can be deformed inwardly and outwardly to become openable and closable. Thereby, it is possible to produce a reducing material for gas pressure welding (not shown) in which an opening/closing opening (not shown) can be formed by opening the opening/closing pieces 226 and 227.

In the gas pressure welding method using this reducing material B2 for gas pressure welding, the opening and closing pieces 226 and 227 are opened to form an opening and closing portion in the cap body 2b. Then, the thick portion of the top is inserted into the gap between the pressure contact surfaces 910 and 920 of the pressure contact materials 91 and 92. Along with this, the opening/closing opening that extends from the part along the top to the hem end is fitted into the side surface of the tip of the fixed side pressure welding material 91, so that when the top is dropped onto the pressure welding surface 910, the pressure welding material It can be attached to the tip of 91.

Note that if the reducing material B2 for gas pressure welding comes off before closing the pressure contact surfaces 910 and 920 of each material to be pressure welded, it is necessary to reinstall the reducing material B2 for gas pressure welding. . At that time, there is no need to greatly widen the gap between the pressure contact surfaces 910 and 920 of the press contact materials 91 and 92, and the gap has a width equivalent to the thickness of the top of the cap body 2b, which is significantly thinner than the entire thickness of the cap body 2b. This is similar to the above-mentioned reducing material A1 for gas pressure welding in that it is possible to attach the reducing material B2 for gas pressure welding just by spreading it out.

(C type)
The reducing material C for gas pressure welding shown in FIG. It is constructed by combining a reducing material C12 for gas pressure welding which has a second cap body having substantially the same shape as the above-mentioned reducing material B1 for gas pressure welding and a structure in which the line of weakness 22a is not provided. Note that a description of the respective structures of the reducing material C11 for gas pressure welding and the reducing material C12 for gas pressure welding will be omitted here.

In this embodiment, the reducing material C for gas pressure welding has a double structure by covering the reducing material C12 for gas pressure welding with the reducing material C11 for gas pressure welding. The reducing material C11 for gas pressure welding is a processed material having the same shape as the reducing material C12 for gas pressure welding, and is covered somewhat tightly with the flexibility of a polystyrene resin sheet.

In addition, in the double-structured reducing material C for gas pressure welding, contrary to the above, the reducing material C12 for gas pressure welding can be combined by covering the reducing material C11 for gas pressure welding. When the reducing material C12 for gas pressure welding is placed over the reducing material C11 for gas pressure welding, the reducing material C11 for gas pressure welding is built into the reducing material C12 for gas pressure welding, so that reduction for gas pressure welding due to unintentional contact etc. This has the advantage that the material C11 is less likely to fall off.

(effect)
Here, with reference to FIGS. 3 and 6, a gas pressure welding method and operation using the C type reducing material C for gas pressure welding will be described.

The reducing material C for gas pressure welding has a structure in which a reducing material C11 for gas pressure welding having a fitting opening is stacked on the outside of a reducing material C12 for gas pressure welding which is a cylindrical body with a bottom.

First, before the top of the cap body of the reducing material C for gas pressure welding is sandwiched between the pressure contact surfaces 910 and 920 of the respective pressure welding materials 91 and 92, that is, when the gap is wide, the reducing material C for gas pressure welding is fixed. When covering the tip of the pressure contact material 91 on the side, the double structure is kept intact. As a result, even if some wind blows before the top of the cap body is pinched, the reducing material C for gas pressure welding can be prevented by the action of the deep body of the reducing material C12 for gas pressure welding, which is a cylindrical body with a bottom. It does not easily come off from the tip of the press-welded material 91.

If the reducing material C for gas pressure welding is not removed before the top of the cap body of the reducing material C for gas pressure welding is pinched between the pressure contact surfaces 910 and 920 of the respective pressure welding materials 91 and 92, the reducing material C for gas pressure welding is not removed. The double-structured reducing material C for gas pressure welding is used as a reducing material as it is. In addition, since the top of the cap body of the reducing material C for gas pressure welding is also double-layered, a favorable effect can be expected on the effectiveness as a reducing material.

In addition, if the reducing material C for gas pressure welding comes off before the top of the cap body of the reducing material C for gas pressure welding is sandwiched between the pressure contact surfaces 910 and 920 of the respective pressure welding materials 91 and 92, the state in which the reducing material C for gas pressure welding comes off is removed. Then, the reducing material C11 for gas pressure welding having the fitting opening 24 in the cap body is removed from the reducing material C12 for gas pressure welding, and only this reducing material C11 for gas pressure welding is used as a reducing material.

The effect when using the reducing material C11 for gas pressure welding is the same as that of the reducing material A1 for gas pressure welding, and when reinstalling the reducing material C11 for gas pressure welding, the pressure contact surfaces 910 of the pressure welding materials 91 and 92, There is no need to widen the 920 gap for adjustment, and the reducing material C11 for gas pressure welding can be installed by simply widening the gap to a width equivalent to the thickness of the top of the cap body, which is significantly thinner than the overall thickness of the cap body. .

The reducing material for gas pressure welding according to the present invention has an air blocking ring and a reducing sheet in order to more reliably prevent the formation of an oxide film on the pressure contact surfaces 910 and 920 when the pressure welding materials 91 and 92 are pressure welded. Can be combined. The reducing material B3 for gas pressure welding shown in FIG. 7 is one of the B-type embodiments.

The reducing material B3 for gas pressure welding has a cap body 3. The cap body 3 is made of a sheet made of polystyrene resin, which is a thermoplastic resin. The body 30 of the cap body 3 has a cylindrical shape with a slightly widened bottom, and its upper end is covered with a circular top plate 31.

The body portion 30 is provided with vertical reinforcing portions 32 that bulge outward at predetermined intervals in the circumferential direction. Further, the trunk portion 30 is provided with a line of weakness 35 that can be separated by tearing. The line of weakness 35 is provided in the circumferential direction along the top plate 31 so as to have a predetermined thickness, and has a perforation 350 having a width that can be fitted into the press-welded material 91.

The thick part formed by the perforation 350 and the top plate 31 has a partially cylindrical shape, and this part also has a fitting that prevents it from falling off when it is externally fitted onto the tip of the press-welded material 91 after the separation piece 300 is separated. Section 351. Note that the reducing material B3 for gas pressure welding has strength due to the vertical reinforcing portion 32 and has good grip on the material 91 to be pressure welded.

Continuing from both ends of the perforation 350, perforations 352 and 353 are formed in a U-shape in the remaining thickness (height) portion of the body 30 in a direction approximately perpendicular to the top plate 31 up to the hem end. It has been formed. Further, a flange portion 36 having a slightly larger diameter is provided at the hem portion of the cap body 3 over the entire circumference. Note that by cutting at the perforations 352 and 353, the separation piece 300 can be separated to form a fitting opening similar to the fitting opening 12 of the reducing material A1 for gas pressure welding.

Furthermore, an air-blocking ring 33 made of polyimide resin, which is a thermosetting resin, is arranged on the inner surface (lower surface) of the top plate 31. A circular reduction sheet 34 made of polystyrene resin and having a diameter slightly larger than that of the ring 33 is welded to the top plate 31 at the center. The reduction sheet 34 is thermally deformed so as to substantially follow the outer shape of the air-blocking ring 33, and cooperates with the inner surface to enclose the air-blocking ring 33 (see the enlarged view in FIG. 7).

When performing gas pressure welding of pressure welding materials 91 and 92 using reducing material B3 for gas pressure welding, use reducing material A1 for gas pressure welding for the fixed side pressure welding material 91 and the movable side pressure welding material 92. Set it up in the same way as for the pressure welding work. For example, when it becomes necessary to reinstall the reducing material B3 for gas pressure welding, the unnecessary part 300 is cut off by cutting the cap body 3 at the perforations 350, 352, and 353, and the unnecessary part 300 is removed. A reducing material for gas pressure welding (not shown) having a mouth part (not shown) can be produced.

The method of use and action of the reducing material for gas pressure welding after forming the fitting opening in the cap body 3 is the same as that of the reducing material A1 for gas pressure welding described above, but with the addition of the air cutoff ring 33 and the reducing sheet 34. , differs in that the resulting effects occur.

In this case, in the pressure welding work, the reducing material B3 for gas pressure welding is heated by the gas flame together with the materials 91 and 92 to be pressure welded, so that the reducing sheet 34 and the top plate 31 are first melted and burned. Then, in the small gap between the pressure welding surfaces 910 and 920 of the pressure welded materials 91 and 92 inside the air blocking ring 33, which is made of thermosetting resin and has not yet melted, the reduction sheet 34 is very thin. Melts and burns in a short time.

Furthermore, as the volume is rapidly increased by vaporization due to combustion, the air that was in the gap inside the air blocking ring 33 is pushed out under high pressure, and the oxygen in the air is combined with the polymeric carbon and becomes carbon dioxide gas. , and oxidation around the pressure welding part is suppressed.

In addition, while the air blocking ring 33 is not melted, air is blocked from entering the gap inside the air blocking ring 33, and oxidation in the gap is suppressed, and the tip surface on the pressure welding side The formation of an oxide film can be suppressed.

In this way, according to the reducing material B3 for gas pressure welding, when performing gas pressure welding, when using natural gas, propane gas, hydrogen gas, etc., which have lower thermal power than acetylene gas, sufficient thermal power can be obtained. Even if heating is performed using a standard flame from the initial heating stage, it is possible to suppress the formation of residues such as oxide films and metal residues on the pressure contact surfaces 910 and 920, so that it is possible to perform pressure contact with sufficient strength.

Note that if the reducing material B3 for gas pressure welding comes off before closing the pressure contact surfaces 910 and 920 of each material to be pressure welded, it is necessary to reinstall the reducing material B3 for gas pressure welding. . At that time, there is no need to greatly widen the gap between the pressure contact surfaces 910 and 920 of the press contact materials 91 and 92, and the gap has a width equivalent to the thickness of the top of the cap body 3, which is significantly thinner than the entire thickness of the cap body 3. Just by unfolding it, the reducing material B3 for gas pressure welding can be attached.

Refer to FIGS. 8(a) and 8(b).
The processing tool 8 is a tool for forming a fitting opening in the cap body E which is not provided with a fitting opening. The processing tool 8 has a base member 80. Support members 81 are provided on both sides of one surface (upper surface in FIG. 8) of the base member 80 in the width direction. A support leg 82 is provided at the distal end of the base member 80, and a support 83 is provided extending from the support member 81 to the support leg 82 so as to be inclined slightly downward in the forward direction.

A seesaw member 84 is placed on the support member 81 so as to be swingable in the direction of the arrow via a fulcrum portion 840 . The tip member 841 (left side in FIG. 8B) of the seesaw member 84 has a shape curved toward the base member 80 in the width direction. A cutting blade 843 having a U-shape in plan view is attached to the concave surface 842 of the tip member 841 on the base member 80 side along the curved shape. Further, as shown in FIG. 8, the seesaw member 84 is formed in a shape that is slightly curved upward with the fulcrum portion 840 as the boundary, and a holding piece 844 is provided at the tip, and an operating portion 845 is provided at the base side. There is.

The seesaw member 84 is biased through a C-shaped leaf spring 85 in a direction in which the tip of the seesaw member 84 and the receiver 83 of the base member 80 are sandwiched between their ends so that they come into close contact with each other. In a normal state, the seesaw member 84 is closed and the cutting blade 843 is accommodated in the blade groove 830 provided in the receiver 83. Note that the cutting blade is not limited to a U-shape, but may be formed, for example, in a U-shape, and the fitting opening portion may be formed in a U-shape.

The seesaw member 84 can be swung in the direction of the arrow by pushing back the operating portion 845. Note that the distance between the tip of the fixture 83 and the cutting blade 843 when the seesaw member 84 is closed is matched with the height of the fitting portion 121 in the thickness direction.

How to use the machining tool 8 will be described with reference to FIGS. 9(a) and 9(b).
Note that the cap body E to be processed here is of a type in which a flange portion is not provided around the opening 100.

First, the operation part 845 is pushed to open the tip member 841 of the seesaw member 84 where the cutting blade 843 is located, and the tip of the base member 80 is inserted through the opening 100 of the cap body E. At this time, the body 101 of the cap body E is placed between the tip of the base member 80 and the tip member 841 of the seesaw member 84.

Then, when the tip of the base member 80 is placed against the top plate 102, the operating portion 845 is loosened, and the leaf spring 85 is returned to its normal state, the tip member 841 is closed. As a result, the holding piece 844 hits the top plate 102 of the cap body E and pinches the top plate 102, and at the same time the cutting blade 843 determines the position, the cutting blade 843 cuts the body part 101 of the cap body E into a U-shape. It fits into the blade groove 830 (see the shape indicated by the dotted line in FIGS. 8(b), 9(a), and 9(b)).

Note that one end of the seesaw member 84 has a generally gutter-shaped curved shape toward the base member 80 side, and the receiver 83 on the base member 80 side is curved to approximately follow the curved surface of the seesaw member 84. The cutting blade 843 provided on the seesaw member 84 has a curved cutting edge that substantially follows the curved surface of the body portion 101 of the cap body E to be processed.

As a result, the cutting edge of the cutting blade 843 is close to the curved surface of the body 101 of the cap body E over almost the entire length before moving in the cutting direction, so the movement of the cutting blade 843 until the cutting is completed is reduced. . Accordingly, the deformation of the cap body E caused by the cutting blade 843 during cutting can be suppressed to a small extent, so that it is also possible to prevent the cap body E from being cut in a distorted manner.

In addition, if the cutting blade 843 cannot sufficiently cut the trunk 101 with the urging force of the leaf spring 85 alone, the tip of the base member 80 and the tip member 841 of the seesaw member 84 can be manually removed from the inside and outside of the cap body E. By sandwiching it between the two, the body 101 of the cap body E can be reliably pushed out.

Note that the processing tool 8 can also be used to process a cap body with a flange formed thereon. In that case, if the flange is suitably deformed and cut so as not to get in the way, the above-mentioned reduction for gas pressure welding can be performed. A reducing material for gas pressure welding that is substantially similar to material A1 can be formed.

The terms and expressions used in this specification and claims are for descriptive purposes only and are not intended to be limiting in any way. There is no intention to exclude terms or expressions that are equivalent to some of them. Further, it goes without saying that various modifications are possible within the scope of the technical idea of the present invention.

A1 Reducing material for gas pressure welding 1a Cap body 10 Body portion 11 Top plate 12 Fitting opening portion 120 Cut edge 121 Fitting portions 122, 123 Cut edge 13 Flange portions 91, 92 Pressure welded material A2 Reducing material for gas pressure welding 1c Cap body 10c Body part 12c Fitting opening part 124 Cutting edge 125 Fitting part 126, 127 Cutting edge 128, 129 Holding part B1 Reducing material for gas pressure welding 2a Cap body 20a Body part 21 Top plate 22a Line of weakness 220 Perforation 221 Fitting part 222, 223 Perforation 229 Hole 200 Separation piece 23a Flange part B2 Reducing material for gas pressure welding 2b Cap body 20b Body part 22b Line of weakness 224, 225 Perforation 226, 227 Opening/closing piece 228 Fitting part 23b Flange part C For gas pressure welding Reducing material C11 Reducing material for gas pressure welding C12 Reducing material for gas pressure welding B3 Reducing material for gas pressure welding 3 Cap body 30 Body section 31 Top plate 32 Vertical reinforcing section 33 Air blocking ring 34 Reducing sheet 35 Line of weakness 350 Perforation 351 Fitting section 352, 353 Perforation 300 Separation piece 36 Flange part 8 Processing tool 80 Base member 81 Support member 82 Support leg 83 Support 830 Blade groove 84 Seesaw member 840 Support part 841 Tip member 842 Concave surface 843 Cutting blade 844 Pressing piece 845 Operation Part 85 Leaf spring

Claims (10)

A cap body made of resin that can be externally fitted onto the tip of the material to be pressure welded is provided, and a fitting opening portion that can be fitted into the material to be pressure welded from the side is formed in the body of the cap body. Reducing material for pressure welding. The fitting opening portion is provided with a cutting edge having a predetermined thickness along the top of the cap body and having a width such that it can be fitted into the press-welded material from the side in the circumferential direction, and following the cutting edge, the body portion 2. The reducing material for gas pressure welding according to claim 1, wherein a cut edge is formed on the remaining thickness of the top part at a predetermined angle with respect to the top part or in a predetermined shape up to the bottom end. A cap body made of resin that can be externally fitted onto the tip of the material to be pressure welded is provided, and a detachable line of weakness is fitted to the body of the cap body so that it can be fitted into the material to be pressure welded from the side. Reducing material for gas pressure welding with a mouth part that can be formed. The line of weakness has a width that allows it to be fitted into the press-welded material from the side in the circumferential direction at a predetermined thickness along the top of the cap body, and subsequently extends the remaining thickness of the body into the top. The reducing material for gas pressure welding according to claim 3, wherein the reducing material is provided at a predetermined angle or in a predetermined shape up to the bottom end. The line of weakness is approximately parallel to the top of the cap body, has a predetermined thickness, has a width that allows it to be fitted into the press-welded material from the side in the circumferential direction, and is connected to the middle part thereof, and is cut off to the hem end. 4. The reducing material for gas pressure welding according to claim 3, wherein the body is provided in a substantially T-shape capable of forming an opening/closing opening for opening and closing the body. A second cap body made of resin that can be externally fitted onto the tip of the press-welded material is provided, and the second cap body closes at least a portion of the fitting opening with its body. The reducing material for gas pressure welding according to claim 1 or 2, wherein the reducing material is stacked on the cap body. The reducing material for gas pressure welding according to claim 2, further comprising a ring body made of resin or metal that is provided on the top of the cap body and melts at a higher temperature than the resin material forming the top. A processing tool that processes the body of a resin cap body that can be externally fitted onto the tip of a material to be pressure welded to form a fitting opening in the cap body that can be fitted from a side surface of the material to be pressure welded. hand,
a base member having a receiver;
a seesaw member that is swingably attached to the base member with one end biased by a spring so as to close toward the base member;
a cutting blade having a predetermined shape that cuts out the insertion opening provided in the seesaw member;
A processing tool, comprising: a blade groove provided in the receiver, into which the cutting blade fits. A resin cap body having a height greater than the gap is attached to one of the materials to be pressure welded, the end surface of which is disposed facing the end surface of the other material to be pressure welded with a predetermined gap therebetween. a step of externally fitting and mounting the tip of the one pressure-welded material by fitting from the side of the pressure-welded material;
A gas pressure welding method comprising the step of abutting and heating the tip surfaces of the one pressure welding material and the other pressure welding material with the cap body attached. In order to enable the cap body to be fitted from the side surface of the one pressure-welded material,
The gas pressure welding method according to claim 9, further comprising a step of forming a fitting opening in the body of the cap body prior to the mounting step.

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