JP2019162651A - Welding method and structure - Google Patents

Abstract

To provide a welding method capable of welding easily.SOLUTION: In a welding method, a pair of U-shaped members 1, 2 each having a U-shaped cross section, which are first and second U-shaped members 1, 2, are placed back-to-back so that each open side is faced outward mutually, in the state where the second U-shaped member 2 is placed on the first U-shaped member 1, and the pair of U-shaped members 1, 2 are moved relatively to a weld zone 3, and a butted part between the first U-shaped member 1 and the second U-shaped member 2 is welded.SELECTED DRAWING: Figure 5

Description

    The present invention relates to a welding method and a structure, and more particularly, to a welding method and a structure that can be easily manufactured.

Conventionally, for example, there is a square pipe having a quadrangular shape that crosses the longitudinal direction.
On the other hand, there has been a desire to easily manufacture an alternative to a square pipe using an existing one.

    However, there has been a problem that it is not possible to easily manufacture an alternative to a square pipe using an existing one.

    An object of this invention is to provide the welding method and structure corresponding to the said request.

    The welding method according to claim 1 is the back-to-back of the pair of U-shaped members having a U-shaped cross-section with the open sides facing each other, and the pair of U-shaped members are the first and second U-shaped members. A pair of U-shaped members that are moved relative to the welded portion in a state where the second U-shaped member is placed on the first U-shaped member. Then, the butted portion between the first U-shaped member and the second U-shaped member is welded.

    The welding method according to claim 2 is the welding method according to claim 1, wherein the first U-shaped member is opened downward including a ceiling wall, a left wall, and a right wall. The U-shaped member of 2 is open upward including a bottom wall, a left wall, and a right wall, and abuts the ceiling wall of the first U-shaped member on a plurality of rollers. The left wall of the first U-shaped member, the left wall of the second U-shaped member, the right wall of the first U-shaped member, and the right wall of the second U-shaped member. 1. Between the upper portion of the left wall of the first U-shaped member and the lower portion of the left wall of the second U-shaped member while being clamped by the second clamping member, The upper part of the right wall of the U-shaped member and the lower part of the right wall of the second U-shaped member are welded simultaneously.

    A welding method according to claim 3 is the welding method according to claim 2, wherein the first U-shaped member and the second U-shaped member sandwiched by the first and second clamping members are used. Horizontal movement of the first U-shaped member and the second U-shaped member on the downstream side or the upstream side of the conveying flow of the first U-shaped member and the second U-shaped member. Is controlled and welded.

    The welding method according to claim 4 is the welding method according to claim 1, 2, or 3, wherein the roller abuts against the ceiling wall of the first U-shaped member and the second U-shape Welding is performed in a state of being pressed by the pressing member toward the bottom wall of the shaped member.

    Further, the structure according to claim 5 is a back-to-back structure in which a pair of U-shaped members whose cross-sectional shape crossing the longitudinal direction is substantially U-shaped and whose open sides face each other outward. The U-shaped members are first and second U-shaped members, which are joined by intermittently welding the butted portions of the first U-shaped member and the second U-shaped member. is there.

    The structure according to claim 6 is the structure according to claim 5, wherein the bottom wall of the second U-shaped member abuts on the ceiling wall of the first U-shaped member, and the butted portion is A front-side butted portion and a back-side butted portion, the front-side butted portion is intermittently welded, the back-side butted portion is intermittently welded, and the welded portion of the front-side butted portion and the back-side butted The welded portion of the portion is disposed symmetrically in plan view with respect to the longitudinal center line of the bottom wall of the second U-shaped member.

    Further, the structure according to claim 7 is the structure according to claim 5 or 6, wherein the welded part of the back side abutting part is symmetrical to the welded part of the front side abutted part and the welded part of the front side abutted part. Are welded simultaneously.

    According to the welding method of claim 1, a pair of U-shaped members having a U-shaped cross section are back-to-back with the open sides facing each other, and the pair of U-shaped members are first and second. A pair of U-shaped members relative to the welded portion in a state where the second U-shaped member is placed on the first U-shaped member. Since it moves and welds the butt | matching part of a said 1st U-shaped member and a said 2nd U-shaped member, it can weld easily.

    According to the welding method of claim 2, in addition to the effect of the invention of claim 1 described above, the ceiling wall of the first U-shaped member is brought into contact with the plurality of rollers, and the first The left wall of the U-shaped member, the left wall of the second U-shaped member, the right wall of the first U-shaped member, and the right wall of the second U-shaped member are the first and second clamping members. While holding, between the upper part of the left wall of the first U-shaped member and the lower part of the left wall of the second U-shaped member, the right wall of the first U-shaped member Since the upper portion and the lower portion of the right wall of the second U-shaped member are welded simultaneously, welding distortion can be prevented and welding can be performed.

    Moreover, according to the welding method of Claim 3, in addition to the effect of invention of Claim 2 mentioned above, the 1st U-shaped member clamped by the 1st, 2nd clamping member, 2nd U-shaped The first U-shaped member and the second U-shaped member on the downstream side or the upstream side of the conveying flow of the first U-shaped member and the second U-shaped member from the sandwiched portion of the shaped member Since the horizontal movement is restricted and welding is performed, welding distortion can be prevented and welding can be performed.

    Moreover, according to the welding method of Claim 4, in addition to the effect of the invention of Claim 1 or Claim 2 or Claim 3 described above, the roller abuts against the ceiling wall of the first U-shaped member. In order to perform welding in a state of being pressed by the pressing member toward the bottom wall of the second U-shaped member, that is, during the welding, the vertical movement of the first U-shaped member and the second U-shaped member Can be welded while preventing welding distortion.

    Further, according to the structure of claim 5, the pair of U-shaped members whose cross-sectional shape crossing the longitudinal direction is substantially U-shaped are back-to-back structures whose open sides face each other outward, The pair of U-shaped members are the first and second U-shaped members, and the butted portions of the first U-shaped member and the second U-shaped member are intermittently welded and joined together. It can be easily manufactured by utilizing two U-shaped members having a substantially U-shaped cross section across the longitudinal direction.

    Moreover, according to the structure of Claim 6, in addition to the effect of the invention of Claim 5 mentioned above, the front side abutting part is intermittently welded, the back side abutting part is intermittently welded, and the front surface Since the welded portion of the side butted portion and the welded portion of the backside butted portion are arranged symmetrically in plan view with respect to the longitudinal center line of the bottom wall of the second U-shaped member, Fewer structures can be obtained.

FIG. 1 is a schematic perspective view of a welding apparatus used in a welding method according to an embodiment of the present invention. FIG. 2 is a schematic side view of FIG. 3A is a schematic cross-sectional view taken along the line AA of FIG. 2, and FIG. 3B is a left wall of the first U-shaped member by the first clamping member of FIG. FIG. 3 shows a state in which the left wall of the second U-shaped member is sandwiched between the right wall of the first U-shaped member and the right wall of the second U-shaped member by the second clamping member. FIG. 3C is a schematic sectional view of a part of FIG. 3A, and FIG. 3C is a back-to-back welding in which a pair of U-shaped members having a U-shaped cross section from FIG. It is a schematic sectional drawing which extracts and shows the previous structure. 4A is a schematic cross-sectional view taken along the line BB in FIG. 2, and FIG. 4B is a left wall of the first U-shaped member by the first clamping member in FIG. 4A. 4 shows a state in which the left wall of the second U-shaped member is sandwiched between the right wall of the first U-shaped member and the right wall of the second U-shaped member by the second clamping member. It is a schematic sectional drawing of a part of (a). FIG. 5 is a schematic cross-sectional view showing a welded state. FIG. 6A is a schematic front view of a structure in which a first U-shaped member and a second U-shaped member are welded, and FIG. 6B is a diagram of FIG. 6A. It is a schematic plan view.

A welding method and structure according to an embodiment of the present invention will be described with reference to the drawings (FIGS. 1 to 6).
FIG. 1 is a schematic perspective view of a welding apparatus used in a welding method according to an embodiment of the present invention.
The object of the welding method is used for building structural members, and is a first U-shaped member [for example, a lip groove type steel having a U-shaped cross section (a cross-sectional shape crossing the longitudinal direction is substantially U-shaped). (C-chan)] 1 and a second U-shaped member [for example, lip groove steel (C-chan)] 2 having a U-shaped cross section (a cross-sectional shape that crosses the longitudinal direction is substantially U-shaped) 2 It is the structure which welds.
1 schematically includes a plurality of rollers 4 attached to a gantry 10, first and second sandwiching members 5 and 6 positioned above the plurality of rollers 4, Horizontal moving means F (F1, F2) (for example, motor FK) for moving the second holding members 5 and 6 in the horizontal direction, and welded portions 3 and 3 ′ arranged on both sides of the plurality of rollers 4 are provided. Yes. In addition to the first and second clamping members 5 and 6 that move, first and second clamping members 5 ′ and 6 ′ that do not move in the conveying flow direction of the pair of U-shaped members 1 and 2 are provided. It has been. The first and second clamping members 5 ′ and 6 ′ are located between the horizontal moving means F 1 and the horizontal moving means F 2 and above the plurality of rollers 4.

As shown in FIGS. 1 to 6, the welding method using the welding apparatus shown in FIG. 1 has a pair of U-shaped members 1 and 2 having a substantially U-shaped cross section across the longitudinal direction, and the open sides face each other outward. The pair of U-shaped members 1, 2 are the first and second U-shaped members 1, 2, and the second U-shape is formed on the first U-shaped member 1. In a state in which the shaped member 2 is placed, the pair of U-shaped members 1 and 2 are moved relative to the welded portions 3 and 3 ′, and the first U-shaped member 1 and the second U-shaped member are moved. The butted portion of the shaped member 2 can be easily welded.
In this embodiment, for example, the welding portions 3 and 3 ′ are fixed and the pair of U-shaped members 1 and 2 are moved.
In addition, the welding parts 3 and 3 'use the welding machine to which a filler metal is sent automatically, for example. In the present embodiment, the welded portions 3 and 3 'are fixed and the pair of U-shaped members 1 and 2 are moved, but in the present invention, conversely, the pair of U-shaped members. You may comprise so that the members 1 and 2 may be fixed and the welding parts 3 and 3 'may be moved.
In short, the pair of U-shaped members 1 and 2 may be moved relative to the welds 3 and 3 ′ for welding.

    Note that welding only one side wall of the left walls 1L and 2L or the right walls 1R and 2R of the pair of U-shaped members 1 and 2 causes welding distortion, so the left walls 1L of the pair of U-shaped members 1 and 2 2L and the right and left walls 1R, 2R may be welded simultaneously by the welded portions 3, 3 ′.

That is, the first U-shaped member 1 has a ceiling wall 1T, a left wall 1L, and a right wall 1R and is open downward, and the second U-shaped member 2 has a bottom wall 2S and a left wall. The wall 2L and the right wall 2R are provided to be opened upward.
And while contacting the ceiling wall 1T of the 1st U-shaped member 1 on the some roller 4, the left wall 1L of the 1st U-shaped member 1, the left wall of the 2nd U-shaped member 2 2L, the right wall 1R of the first U-shaped member 1 and the right wall 2R of the second U-shaped member 2 are clamped by the first and second clamping members 5 and 6 (see FIGS. 3 and 4). However, between the upper part of the left wall 1L of the first U-shaped member 1 and the lower part of the left wall 2L of the second U-shaped member 2, the upper part of the right wall 1R of the first U-shaped member 1 and Between the lower part of the right wall 2R of the 2nd U-shaped member 2, it welds simultaneously by welding part 3, 3 '. In addition, the welding site | part W (W1, W2) is shown in FIG.5 and FIG.6.

    As described above, the ceiling wall 1T of the first U-shaped member 1 is brought into contact with the plurality of rollers 4, and the left wall 1L of the first U-shaped member 1 and the second U-shaped member 2 are While sandwiching the left wall 2L, the right wall 1R of the first U-shaped member 1 and the right wall 2R of the second U-shaped member 2 with the first and second clamping members 5 and 6 (see FIG. 3). Between the upper part of the left wall 1L of the first U-shaped member 1 and the lower part of the left wall 2L of the second U-shaped member 2, the upper part of the right wall 1R of the first U-shaped member 1 and the first Since the space between the lower portion of the right wall 2R of the U-shaped member 2 is welded simultaneously, welding distortion can be prevented and welding can be performed.

Further, the first U-shaped member 1 and the second U-shaped member 2 clamped by the first and second clamping members 5 and 6 shown in FIGS. On the upstream side of the conveying flow D (see FIG. 2) of the U-shaped member 1 and the second U-shaped member 2, the first U-shaped member 1 and the second U-shaped member 2 are caused by heat during welding. Moves in the horizontal direction to cause welding distortion, so the first U-shaped member 1 and the second U-shaped clamped by the first and second clamping members 5 and 6 attached to the horizontal moving means F1. The first U-shaped member 1 and the second U-shaped member 2 upstream of the conveying flow D of the first U-shaped member 1 and the second U-shaped member 2 from the clamping portion C of the member 2. The movement in the horizontal direction is restricted (specifically, the first U-shape is clamped by the first and second clamping members 5 ′ and 6 ′ provided between the horizontal movement means F1 and the horizontal movement means F2. Shaped member 1, The second horizontal movement of the U-shaped member 2 regulations) to have so as to weld.
The first and second clamping members 5 ′ and 6 ′ control the clamping state with an air cylinder 51 ′ as shown in FIGS. 4 (a) and 4 (b), for example.
The regulation described above is downstream of the conveyance flow D (see FIG. 2) from the clamping portion of the first U-shaped member 1 and the second U-shaped member 2 sandwiched by the first and second clamping members 5 and 6. The regulating members 7 and 7 'located on the side may be used. The restricting members 7 and 7 ′ are, for example, first and second ruler rollers.
Further, as shown in FIG. 1, the first and second U-shaped members 1 and 2 are conveyed by the horizontal movement means F1, but the tips of the first and second U-shaped members 1 and 2 are When the position shown in FIG. 2 is reached, the first and second U-shaped members 1 and 2 are conveyed by the horizontal movement means F2, and are attached to the horizontal movement means F2. 6, downstream of the conveying flow D of the first U-shaped member 1 and the second U-shaped member 2 from the clamping portion C ′ of the first U-shaped member 1 and the second U-shaped member 2 sandwiched by 6. On the side, the horizontal movement of the first U-shaped member 1 and the second U-shaped member 2 is restricted (specifically, the first U-shaped member 1 provided between the horizontal moving means F1 and the horizontal moving means F2). The second clamping members 5 ′ and 6 ′ are clamped and the horizontal movement of the first U-shaped member 1 and the second U-shaped member 2 is restricted) and welded.
The first and second clamping members 5 and 6 control the clamping state with air cylinders 5 ″ and 6 ″ as shown in FIGS. 3A and 3B, for example.

Even if the first and second U-shaped members 1 and 2 are welded while being sandwiched between the first and second clamping members 5 and 6, the first U-shaped member 1 is heated by the welding heat. Since the second U-shaped member 2 moves in the vertical direction to cause welding distortion, the roller 4 comes into contact with the ceiling wall 1T of the first U-shaped member 1 as shown in FIG. At the same time, the pressing member 9 may be pressed toward the bottom wall 2S of the second U-shaped member 2.
Thus, at the time of welding, the vertical movement of the first U-shaped member 1 and the second U-shaped member 2 can be restricted, so that welding distortion can be prevented and welding can be performed.
The pressing member 9 is moved up and down by, for example, an air cylinder 9 ′.

FIG. 6A is a schematic front view of the structure 100 in which the first U-shaped member 1 and the second U-shaped member 2 are welded, and FIG. It is a schematic plan view of 6 (a).
The structure 100 is a back-to-back structure 100 in which a pair of U-shaped members 1 and 2 whose cross-sectional shape crossing the longitudinal direction is substantially U-shaped and whose open sides face each other outward. The members 1 and 2 are the first and second U-shaped members 1 and 2, and the butted portions of the first U-shaped member 1 and the second U-shaped member 2 are intermittently welded and joined. It is a thing.
More specifically, in the structure 100, the bottom wall 2 </ b> S of the second U-shaped member 2 abuts on the ceiling wall 1 </ b> T of the first U-shaped member 1, and the butted portion is a front side butting. A part and a back side abutting part, wherein the front side abutting part is intermittently welded and the back side abutting part is intermittently welded.
Then, as shown in FIG. 6B, the welded portion W1 of the front side butted portion and the welded portion W2 of the backside butted portion are center line OO in the longitudinal direction of the bottom wall 2S of the second U-shaped member 2. It is arranged symmetrically in plan view with respect to '. Therefore, the structure 100 with less welding distortion can be obtained.
More preferably, the welding part W1 of the front side abutting part and the welding part W2 of the back side abutting part symmetrical to the welding part W1 of the front side abutting part may be welded simultaneously.

Note that the movement of the pair of U-shaped members 1 and 2 is horizontal movement means F (F1, F1) for moving the first and second holding members 5 and 6 holding the pair of U-shaped members 1 and 2 horizontally. F2) (see FIGS. 1 and 2).
For example, as shown in FIGS. 3A and 3B, the horizontal moving means F (F1, F2) are attached to a moving base FB, a driving motor FK attached to the base FB, and a shaft of the motor FK. A pinion (gear) FP, and a rack FR that is screwed with the pinion (gear) FP. The rack FR is fixed to the gantry 10. Moreover, the 1st, 2nd clamping members 5 and 6 are attached to the base FB.
The number of horizontal moving means F may be one, but preferably two horizontal moving means F (F1, F2) are preferable.
For example, the first and second sandwiching members 5 and 6 sandwiching the pair of U-shaped members 1 and 2 are moved by the horizontal moving means F1 on the downstream side of the transport flow D, and the pair of sandwiched U-shaped members are sandwiched. The first and second tip sides are the positions of the horizontal moving means F2 upstream of the transport flow D, that is, a pair of moving U-shaped members 1 and 2 are connected to the horizontal moving means F2 upstream of the transport flow D. When the first and second holding members 5 and 6 come to a position where they can be held, the holding state of the first and second holding members 5 and 6 connected to the horizontal moving means F1 is released and the horizontal moving means F1 Moves to the downstream side of the transport flow D, and sandwiches the pair of U-shaped members 1 and 2 between the first and second clamping members 5 and 6 connected to the horizontal movement means F2, and moves in the transport flow D direction. In this way, the manufacturing speed is shortened.

DESCRIPTION OF SYMBOLS 1 1st U-shaped member 2 2nd U-shaped member 3 Welding part

Claims (7)

A pair of U-shaped members having a U-shaped cross section are back-to-back with the open sides facing each other, and the pair of U-shaped members are first and second U-shaped members, and the first In a state where the second U-shaped member is placed on the U-shaped member, the pair of U-shaped members are moved relative to the welded portion, and the first U-shaped A welding method comprising welding a butted portion of a member and the second U-shaped member. The first U-shaped member is opened downward including a ceiling wall, a left wall, and a right wall,
The second U-shaped member is an open top with a bottom wall, a left wall, and a right wall,
The ceiling wall of the first U-shaped member is brought into contact with a plurality of rollers, the left wall of the first U-shaped member, the left wall of the second U-shaped member, the first While holding the right wall of the U-shaped member and the right wall of the second U-shaped member with the first and second clamping members, the upper portion of the left wall of the first U-shaped member and the Between the lower part of the left wall of the second U-shaped member, between the upper part of the right wall of the first U-shaped member and the lower part of the right wall of the second U-shaped member. The welding method according to claim 1, wherein welding is performed simultaneously. Conveying flow of the first U-shaped member and the second U-shaped member from the first U-shaped member clamped by the first and second clamping members, and the clamping portion of the second U-shaped member 3. The welding method according to claim 2, wherein the first U-shaped member and the second U-shaped member are restrained in the horizontal direction on the downstream side or the upstream side, and welding is performed. The welding is performed in a state where the roller abuts against the ceiling wall of the first U-shaped member and is pressed by the pressing member toward the bottom wall of the second U-shaped member. The welding method according to claim 2 or claim 3. A back-to-back structure in which a pair of U-shaped members whose cross-sectional shape crossing the longitudinal direction is substantially U-shaped, the open sides face each other outwardly,
The pair of U-shaped members are first and second U-shaped members,
A structure in which the butted portions of the first U-shaped member and the second U-shaped member are joined intermittently and welded together. The bottom wall of the second U-shaped member abuts on the ceiling wall of the first U-shaped member;
The butted portion is a front-side butted portion and a back-side butted portion,
The front side butted portion is intermittently welded,
The back side butted portion is intermittently welded,
The welded portion of the front side butted portion and the welded portion of the backside butted portion are:
The structure according to claim 5, wherein the second U-shaped member is arranged symmetrically in plan view with respect to a center line in a longitudinal direction of a bottom wall of the second U-shaped member. The structure according to claim 5 or 6, wherein a welded portion of the front side butted portion and a welded portion of the backside butted portion symmetrical to the welded portion of the front side butted portion are welded simultaneously.

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