JP2610327B2 - Method and apparatus for forming welded joint of pipe material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a pipe material for forming a welded joint to which a member to be welded is joined on a peripheral surface of a pipe material to be welded in a crossed state. The present invention relates to a method and an apparatus for forming a welded joint portion.

[Conventional technology]

Conventionally, as shown in FIG. 10, a guide member 25 into which a support post 24 of a headrest 23 is inserted with respect to a pipe member 22 embedded in a seat back 21 to form a seat back frame.
Are welded in an intersecting state, etc., a concave portion is formed in the peripheral surface of the pipe member 22 in advance by press working, and the peripheral surface of the guide member 25 is brought into contact with the concave portion. And the guide member 25 are welded. That is, as shown in FIG. 11, the pipe material 22 supported by the lower mold 26 is pressed by an upper mold 28 having an arc-shaped projection 27 corresponding to the peripheral surface of the guide member 25, and The circumferential surface of the material 22 is plastically deformed to form a concave portion 29 serving as a weld joint.

[Problems to be solved by the invention]

When the peripheral surface of the pipe member 22 is pressed by the upper die 28, since the pipe member 22 is hollow, as shown in FIG. When you need to dent more than necessary,
The formation of a gap between the concave portion 29 of 22 and the peripheral surface of the member to be welded including the guide member 25 and the like could not be avoided. Therefore, when welding the pipe material and the member to be welded, it is difficult to accurately position the member to be welded, and it is difficult to weld in a proper state due to the presence of the gap. Was. In particular, when welding a pipe material and a member to be welded using a robot or an automatic welding machine, there is a problem that if a large gap is formed between the two members, automatic welding cannot be performed.

The present invention has been made in order to solve the above problems, and by accurately forming a welded joint portion formed of a recess corresponding to the peripheral surface of a member to be welded on a pipe material, With the workpiece to be positioned accurately,
An object of the present invention is to provide a method and an apparatus for forming a welded joint of a pipe material that enable appropriate welding of both members.

[Means for solving the problem]

The present invention relates to a method for forming a welded joint of a pipe material by forming a concave portion to which a member to be welded is formed on a peripheral surface of a pipe material to be welded in a crossed state. In a state where the pipe member is supported by the support member formed of one electrode of the resistance welding machine, the other electrode having the projection for processing the concave portion is pressed against the peripheral surface of the pipe member, and a current is applied between the two electrodes. While the pipe material is heated by the resistance heat generated in response to the current, and a recess serving as a weld joint portion is pressed on the peripheral surface of the pipe material by the projection of the electrode.

Also, in order to allow the pipe member and the member to be welded to be more firmly joined, a projection for forming a concave portion is formed at the distal end, and a fillet welding portion is formed at the base end of the projection. It is desirable to press work the peripheral surface of the pipe material supported by the support member using the electrode of the resistance welding machine in which the step is formed.

Further, as a forming device for a welded joint portion of a pipe material for forming a welded joint portion by forming a concave portion to which a member to be welded is formed on a peripheral surface of a pipe material to be welded in a crossed state, A support member for pipe material consisting of one electrode of a resistance welding machine, and a press member for welding joint processing comprising the other electrode are provided, and a projection for processing the recess is formed at the tip of the press member. It is desirable to use a protrusion formed with a step for processing a fillet weld at the base end of the protrusion.

[Action]

In the method for forming a welded joint of a pipe material configured as described above, the pipe material is heated by resistance heat generated in accordance with a current passed between the two electrodes of the resistance welding machine. In this state, when the peripheral surface of the pipe material is pressurized by the electrode having the projection for processing the concave portion, the appropriately shaped welded joint portion having the concave portion corresponding to the peripheral surface of the member to be welded is formed. The surface will be accurately pressed.

In addition, a projection for forming a concave portion is formed at a distal end portion, and a step portion for forming a fillet weld portion is formed at a base end portion of the projection portion. When press-forming is performed, a concave portion is formed on the peripheral surface of the pipe material to which the member to be welded is joined, and at the same time, a fillet weld is formed in which the side of the concave portion is filled with a weld metal. A part is formed.

〔Example〕

FIG. 1 shows an example of a forming apparatus for carrying out a method for forming a welded joint of a pipe material according to the present invention. This forming apparatus includes a support member 2 composed of a lower electrode of a resistance welding machine 1 and a press member 3 composed of an upper electrode.
The support member 2 has a support surface 5 extending in the axial direction in an arc-shaped cross section corresponding to the peripheral surface of the pipe member 4, and has a central portion on the upper surface of the support member 2 at the time of pressing the pipe member 4. A pair of arc-shaped concave portions 6 serving as a meat escape portion are formed.

The press member 3 is supported by a pressurizing means (not shown) so as to be able to move up and down. A lower part of the press member 3 has a pipe material 4 having an arc-shaped cross section corresponding to a peripheral surface of a member to be welded, which will be described later. The protrusion 7 extends in a direction perpendicular to the axis. The supporting members 2 and the pressing members 3 are connected to lead wires 8 and 9 which are electrically connected to the electrodes B of the resistance welding machine 1, respectively.

In order to form a welded joint on the peripheral surface of the pipe member 4 by the forming device having the above configuration, the pipe member 4 is placed on the support surface 5 of the support member 2 and is supported, and is pressed by a pressing means. The member 3 is lowered, and the lower end thereof is pressed against the peripheral surface of the pipe member 4. In this state, lead wire from resistance welding machine 1
An electric current is passed through the support member 2 and the press member 3 via the pipes 8 and 9, and the electric current heats the pipe member 4 by resistance heat generated when the pipe member 4 conducts. Then, when the rigidity of the pipe member 4 is reduced by sufficiently heating the pipe member 4, the pipe member 4 is deformed in accordance with the pressing force of the press member 3, and as shown in FIG. Projection 7 of press member 3
The concave portion 10 corresponding to is pressed. In addition, the recess
When the pipe 10 is pressurized, the flesh of the pipe material 4 moves laterally, and as shown in FIGS. 3 and 4, a projection 11 is formed along the arcuate concave portion 6 of the support member 2. Will be.

The press member 3 composed of the upper electrode is pressed against the peripheral surface of the pipe member 4 supported by the support member 2 composed of the lower electrode of the resistance welding machine 1 as described above, and between the support member 2 and the press member 3. Since the concave portion 10 is pressed by the projection 7 of the press member 3 while heating the pipe member 4 by applying an electric current, a weld joint portion having an appropriate shape composed of the concave portion 10 corresponding to the peripheral surface of the member to be welded. Can be molded.
That is, since the pipe member 4 is heated by a current supplied from the power source 8 of the resistance welding machine 1 and the recess 10 is processed in a state where the rigidity of the pipe member 4 is reduced, the pipe member is not heated. Unlike the conventional example in which the press working is performed directly by the upper die, the side portion of the welded joint portion is not recessed, and the recess 10 precisely corresponding to the projection 7 of the press member is formed in the pipe member 4. It can be formed on the peripheral surface.

Therefore, as shown in FIG. 5, in a state where the member to be welded 12 is brought into close contact with the concave portion 10 of the pipe member 4 and accurately positioned, the joint portion is appropriately welded by an automatic welding machine or the like, and And the member to be welded 12 can be easily and firmly joined in an intersecting state. Further, in the above embodiment, since the arc-shaped concave portion 6 serving as a relief portion of the meat when the pipe shape 4 is pressed is provided on the upper surface of the support member 2, the weld joint portion is formed smoothly and the press working is performed. At times, the pipe member 4 can be prevented from being extremely deformed and broken.

FIG. 6 shows that a projection 7 for processing a concave portion is formed at the distal end of the press member 3a, and a step portion 13 for processing a fillet weld is formed on the left and right sides of the base end of the projection 7; And support members
2A shows a molding device in which a concave groove 14 having an arc-shaped cross section corresponding to the protrusion 7 is formed on the upper surface of 2a. The support member 2a
With the pipe member placed and supported on the support surface 5 of the above, the press member 3a is pressed against the peripheral surface of the pipe member 4 to flow an electric current between the support member 2a and the press member 3a, When the pipe material 4 is pressed while heating the pipe material 4 by the resistance heat generated in response to the current, as shown in FIG. 7 to FIG. And the fillet welded portion 15 filled with the weld metal can be formed at the same time.

When the recess 10 and the fillet weld 15 are formed into the pipe material 4 by the press member 3a as described above, the filling position of the weld metal 16 is clarified by the fillet weld 15, The welding work between the pipe member 4 and the member to be welded 12 can be performed more easily and accurately. Also,
Since the peripheral surface of the pipe material 4 is pressed in two steps of the fillet welded portion 15 and the concave portion 10, the concave portion 10 is processed up to the lower portion of the pipe material 4 without breaking the pipe material 4. It is possible to perform deep drawing. Therefore, as shown in FIG. 9, in a state where the member to be welded 12 is buried in the weld joint portion of the pipe member 4 for half or more, both members 4,
12 can be firmly joined.

Since the fillet welded portion 15 of the pipe member 4 is buried by being filled with the welded metal member 16, the appearance after welding is formed well. In addition, the concave groove 14 formed in the support member 2a serves as a clearance for meat at the time of press working, and is provided to prevent the lower end of the press member 3a from contacting the support member 2a. However, when there is no possibility that the press member 3a or the like comes into contact with the support member 2a, the concave groove 14 may be omitted.

〔The invention's effect〕

As described above, the present invention relates to a method for forming a welded joint portion of a pipe material in which a concave portion to which a member to be welded is formed is formed on a peripheral surface of a pipe material to which members to be welded are joined in an intersecting state. In a state in which the pipe member is supported by the support member composed of one electrode of the machine, the other electrode having the projection for processing the concave portion is pressed against the peripheral surface of the pipe member to flow a current between the two electrodes. In order to reduce the rigidity of the pipe material by heating the pipe material and press the welding joint portion on the peripheral surface of the pipe material by the protrusion of the electrode, a welded joint having an appropriate shape along the protrusion is formed. The part can be easily formed. Therefore, in a state where the member to be welded is accurately positioned at the welding joint portion of the pipe material, both members can be appropriately welded, and automatic welding can be performed using an automatic welding machine or the like.

Also, the above-described press working is performed by using an electrode of a resistance welding machine in which a projection for recess processing is formed at the distal end and a step for processing a fillet weld is formed at the base end of the projection. In the case of, since a welded joint composed of the recess and the fillet weld is formed on the peripheral surface of the pipe material,
There is an advantage that the welding position of the two members can be more easily performed by clarifying the filling position of the weld metal, and the deep drawing of the recess can be performed so that the two members can be more firmly joined.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a specific example of a forming apparatus used to carry out a method for forming a welded joint of a pipe material according to the present invention. FIG. 2 is a front view showing a formed state of the welded joint.
FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 2, FIG. 4 is a perspective view showing a pipe member formed with the above-mentioned welded joint, and FIG. 5 shows a welding state between the pipe member and a member to be welded. FIG. 6 is a perspective view showing an embodiment of the apparatus for forming a welded joint of a pipe material according to the present invention, FIG. 7 is a front view showing a state of forming the welded joint by the above-mentioned forming apparatus, and FIG. Is a perspective view showing the pipe material after the above-mentioned forming, FIG. 9 is a front view showing a welding state between the pipe material and the member to be welded, FIG. 10 is a front view showing an example of use of the pipe material, and FIG. FIG. 12 is a front view showing a conventional example of a method for forming a welded joint portion of a pipe material, and FIG. 12 is a front view showing a welding state between a pipe material formed by this conventional example and a member to be welded. 1 ... resistance welding machine, 2 ... support member (one electrode), 3
…… Press member (the other electrode), 4… Pipe material, 7…
... projecting part, 10 ... concave part, 12 ... member to be welded, 13 ... step part,
15 ... Fillet weld

Claims (3)

(57) [Claims] 1. A method of forming a welded joint of a pipe material for forming a welded joint portion by forming a concave portion for joining a member to be welded on a peripheral surface of the pipe material to be welded in an intersecting state. In the method, in a state where the pipe member is supported by the support member formed of one electrode of the resistance welding machine, the other electrode having the projection for processing the concave portion is pressed against the peripheral surface of the pipe member, and between the two electrodes. An electric current is supplied, and while the pipe material is heated by resistance heat generated in accordance with the current, a concave portion serving as a weld joint portion is pressed on the peripheral surface of the pipe material by the projection of the electrode. A method for forming a weld joint of a pipe material. A supporting member is formed by an electrode of a resistance welding machine in which a projection for processing a recess is formed at a distal end and a step for processing a fillet weld is formed at a base end of the projection. 2. The method for forming a welded joint of a pipe material according to claim 1, wherein the peripheral surface of the pipe material supported by the pipe is pressed. 3. A welded joint portion of a pipe material for forming a welded joint portion by forming a concave portion for joining a welded member on a peripheral surface of the pipe material to be welded in an intersecting state. In the apparatus, a support member of a pipe material formed of one electrode of a resistance welding machine, and a press member for processing a weld joint portion formed of the other electrode are provided, and a protrusion for processing the recess is provided at a tip end of the press member. An apparatus for forming a welded joint of a pipe material, wherein a step for forming a fillet weld is formed at a base end of the projection.