WO2020054309A1

WO2020054309A1 - Butt welding truck and butt welding method

Info

Publication number: WO2020054309A1
Application number: PCT/JP2019/032089
Authority: WO
Inventors: 将一野々村; 亨飯島; 直貴大岩; 聡山中; 秀隆早川
Original assignee: 株式会社Ihi
Priority date: 2018-09-12
Filing date: 2019-08-16
Publication date: 2020-03-19
Also published as: JPWO2020054309A1

Abstract

The present invention is provided with: a gantry loader body 23 which travels along a U groove Wu on the upper surface side of a butted portion between large panels W, W; and three welding torches 26 which are mounted on the gantry loader body 23 and are arranged side by side with distances therebetween above the U groove Wu. Among the three welding torches 26 which simultaneously move with traveling of the gantry loader body 23, the leading welding torch 26 performs penetration welding to form a penetration bead B on the lower surface side of the butted portion between the large panels W, W, the subsequent welding torch 26 performs build-up welding to make a buildup B2 in the U groove Wu, and the last welding torch 26 performs welding to make a buildup B3 for adjusting the appearance of the U groove Wu. When butt welding of aluminum alloy-made to-be-welded materials is performed, the welding work time can be shortened and welding deformation can be reduced while work for reversing the to-be-welded materials is omitted.

Description

Butt welding cart and butt welding method

The present disclosure relates to a butt welding trolley used in manufacturing a large-sized structure, for example, a self-supporting square tank (Self-supporting, {Prismatic-shape} IMO type B (self-supporting square type IMO type B tank)) mounted on a tanker. And a butt welding method.

自 As the self-standing square tank described above, there is an aluminum alloy tank manufactured according to the shape of the hull, and such a self-standing square tank is composed of a large number of individually manufactured blocks. The first manufacturing process for each of a large number of blocks is a butt welding process in which large panels made of aluminum alloy (for example, large panels of 16 m square; material to be welded) are butt-connected to each other and joined by MIG welding.

Conventionally, as described above, when butt-welding large panels made of aluminum alloy, first, two large panels are placed side by side on a jig capable of supporting the large panels horizontally, and the two panels are joined together. The upper surfaces of both panels are joined by performing downward welding on the butted portions.
At this time, the aluminum alloy (aluminum), which is the material of the large panel, has a high linear expansion coefficient and is easily deformed. Therefore, if only one side of the panel is facing downward from the top side of both panels, the welding torch must be used. Heating and cooling are repeated as many times as the number of movements, and welding deformation occurs during cooling.

Therefore, conventionally, both panels whose upper surfaces are joined to each other are inverted by using a crane or the like, and, like the upper surfaces, the two panels are welded to each other to join the lower surfaces of both panels. By doing so, large panels were butt-joined. For such butt welding of panels, for example, MIG welding described in Non-Patent Document 1 is employed.

In the conventional butt welding of large panels as described above, both panels joined to each other on the upper surface side of the butt portion must be inverted by using a crane or the like. Therefore, much time must be spent on the inversion of this large panel. There was a problem.

When the thickness of the large panel is large, the welding is performed by moving the welding torch a plurality of times on each of the upper surface and the lower surface of both panels, thereby filling the gap between the panels. It is necessary to repeat the heating and cooling multiple times, so that the time required for joining is long and there is a problem that welding deformation cannot be suppressed during cooling. Had been an issue.

The present disclosure has been made in view of the conventional problems described above, for example, when butt-welding large-sized workpieces made of aluminum alloy, eliminates the required reversal work of the workpiece to be welded. In addition, an object of the present invention is to provide a butt welding bogie and a butt welding method capable of realizing a reduction in butt welding operation time and a reduction in welding deformation.

According to a first aspect of the present disclosure, there is provided a butt welding bogie for joining and joining horizontally supported aluminum alloy workpieces, and an upward groove formed on an upper surface side of a butt portion between the workpieces. A bogie main body running along the bogie, and two or more welding torches mounted on the bogie main body and arranged side by side at a distance on the upward groove at a butt portion between the materials to be welded, The leading welding torch of the two or more welding torches simultaneously moving along the upward groove by running of the main body is a back surface for forming a Uranami bead on a lower surface side at a butt portion between the workpieces. Wave welding is performed, and the welding torch subsequent to the leading welding torch is build-up welding for filling the upward groove, and the last welding torch of the two or more welding torches is performed. Ji are configured to perform welding Serve meat for adjusting the appearance to the upwardly open destination.

In the butt welding trolley according to the first aspect of the present disclosure, for example, when two welded materials made of an aluminum alloy placed side by side on a jig are joined by butt welding, a distance is set on an upward groove between the welded materials. When the bogie body equipped with two or more welding torches arranged side by side is run along an upward groove, the welding torch located at the head in the traveling direction performs uranami welding to form a butt between the workpieces. Uranami beads are formed on the lower surface side.

Then, the welding torch subsequent to the first welding torch performs build-up welding to fill the upward groove, and the last welding torch also forms the upper groove to form the outer groove.
In other words, the butt welding cart enables welding of the butted portions of the two materials to be welded to the upper surface and the lower surface while being placed on the jig, without having to reverse both the materials to be welded by a crane or the like. As a result, the welding operation time can be shortened accordingly.

At this time, in the butt welding bogie according to the first aspect of the present disclosure, the butt joining of the two materials to be welded is completed by a single movement of the bogie main body equipped with two or more welding torches. Compared to the case where butt welding is repeatedly performed with one welding torch, the welding operation time can be further reduced.

Additionally, since it is not necessary to repeat welding, the number of times of heating and cooling is reduced, and welding deformation is correspondingly reduced.

In the butt welding cart according to the present disclosure, for example, in the case of butt welding large-sized workpieces made of aluminum alloy, after eliminating the required reversal work of the workpiece, the butt welding work time A very excellent effect that shortening and reduction of welding deformation can be realized is provided.

It is a perspective explanatory view showing a to-be-welded material joined by a butt welding trolley concerning one example of this indication. 1 is an explanatory side view of a butt welding cart according to an embodiment of the present disclosure. 1 is an explanatory front view of a butt welding cart according to an embodiment of the present disclosure. FIG. 2B is an enlarged sectional explanatory view showing a build-up state at a groove between welded materials when butt welding is performed using the butt welding carts of FIGS. 2A and 2B.

Hereinafter, the present disclosure will be described with reference to the drawings.
FIG. 1 shows a large panel (welded material) made of an aluminum alloy joined by a butt welding trolley according to an embodiment of the present disclosure, and FIGS. 2A and 2B show the panels according to an embodiment of the present disclosure. 5 shows a butt welding cart.

As shown in FIG. 1, at the abutting portion between aluminum alloy large panels W and W (weld to be welded) placed horizontally on a jig J, a U groove Wu is provided on the upper surface side (upper side in the figure). (Upward groove), and a gap Wg is formed on the lower surface side (the lower side in the figure). At both ends (only one end is shown) of the butted portion between the large panels W, a tab plate WT having a groove Wm continuous with the U groove Wu is mounted.

As shown in FIGS. 2A and 2B, the downward welding bogie (butt welding bogie) 21 for performing welding on the U groove Wu formed between the large panels W, W is a gantry type MIG welding bogie. The downward welding cart 21 includes a gantry loader body (cart body) 23 having two suspension arms 22 each having a roller 22a at a tip, a driving force transmission mechanism 24 mounted on the gantry loader body 23, and a U-opening. The guide beam 25 is provided along the tip Wu.

The guide beam 25 is provided with a roller receiver 25a that movably suspends and holds the respective rollers 22a of the

suspension arms

22, 22 of the gantry loader main body 23. The downward welding carriage 21 is provided with a driving force transmission mechanism 24. The vehicle travels along the guide beam 25 by transmitting the rotational force of the driving roller 24 a provided to the roller receiver 25 a of the guide beam 25.

The downward welding cart 21 is disposed so as to protrude in the lateral direction of the gantry loader main body 23 (rightward in FIG. 2B), and supports the three

welding torches

26, 26, 26 obliquely downward. Each of the three

welding torches

26, 26, 26 is provided with a

wire straightener

30, 30, 30, which individually sends a welding wire 28 from a wire reel (not shown) to the

welding torches

26, 26, 26. .

In this case, the three

welding torches

26, 26, 26 are arranged at a distance on the U-groove Wu between the large panels W made of aluminum alloy. As shown in FIG. 3, the leading welding torch 26 located at the left end of FIG. 2A among the three

welding torches

26, 26, 26 simultaneously moved by the traveling of the gantry loader main body 23 is located on the lower surface side of the U groove Wu. Then, a backside weld for forming a backside bead B is performed. The subsequent intermediate welding torch 26 performs build-up welding for filling the meat B2 on the U groove Wu. The welding torch 26 located at the rear end of the right end of FIG. 2A performs welding for filling the meat B3 for adjusting the appearance to the U groove Wu.

Here, the interval between the three

welding torches

26, 26, 26 is defined as an interval at which the build-up by the subsequent welding torch 26 is performed after the meat built up by the leading welding torch 26 is completely solidified. It is determined according to the traveling speed (welding speed) of the welding cart 21.

The torch support portion 27 is provided along a rail 27a in a direction (horizontal direction in FIG. 2B) orthogonal to the traveling direction of the gantry loader main body 23 disposed on the gantry loader main body 23, and along the rail 27a by an output from a moving motor 27e. The slide body 27b includes a reciprocating slide body 27b, a vertical lift guide 27c connected to the slide body 7b, and a torch holder 27d that moves up and down along the lift guide 27c by an output from a lift motor 27f.

Further, the downward welding cart 21 includes a groove copying roller 31 arranged in the gantry loader main body 23 and a control unit (not shown).
The groove copying roller 31 is engaged with the U groove Wu between the large panels W, W in advance of the welding torch 26, thereby suppressing the three

welding torches

26, 26, 26 from wobbling. The welding torches 26, 26, 26 are moved along the U groove Wu.

Further, the downward welding cart 21 is provided with

wheels

33, 33 disposed at front and rear ends of the gantry loader main body 23 to absorb bending of a beam portion of the gantry loader main body 23, respectively, and has three welding torches 26. , 26, 26 are provided with

gas nozzles

34, 34, 34 for blowing a shielding gas to each of them.

符号 In addition, the code | symbol 35 in FIG. 2B is a backing material. The backing material 35 is pressed against the lower surface side of the butted portion between the large panels W by the pressure of the fire hose 37 sandwiched between the backing material 35 and the support base 36.

Therefore, a procedure for butt-joining the large panels W made of aluminum alloy placed on the jig J using the downward welding cart 21 will be described.

First, the aluminum alloy large panels W mounted on the jig J are temporarily attached to each other by welding at a plurality of locations, and tabs are provided at both ends (only one end is shown) of the butted portion between the large panels W, W. Attach plate WT.

After this temporary attachment, downward welding is performed on the U-groove Wu on the upper surface side between the large panels W by the downward welding carriage 21.

In the downward welding by the downward welding cart 21, the leading welding torch 26 located at the left end in FIG. 2A among the three

welding torches

26, 26, 26 moving along the U groove Wu is shown in FIG. As described above, the Uranami welding is performed to fill the meat B1 to form the Uranami bead B on the lower surface side of the U groove Wu.

Then, the following intermediate welding torch 26 is made to perform build-up welding for filling the meat B2 on the U groove Wu, and the last welding torch 26 located at the right end in FIG. Is welded to fill the meat B3 to adjust the appearance.

In this downward welding, if the meat cannot be filled in the U groove Wu by one movement (one pass) of the three

welding torches

26, 26, 26, the downward welding bogie 21 is returned to the welding start position, The downward welding is repeated until the meat is filled in the U groove Wu.

In the butt welding method according to the present embodiment, as described above, when two large aluminum alloy panels W, W placed side by side on the jig J are butt-joined, the downward welding cart 21 The welding to the upper surface side and the lower surface side at the butted portion of the two large panels W, W can be performed while being mounted on the jig J. As a result, it is not necessary to invert the two large panels W, W by a crane or the like, so that the welding operation time can be shortened accordingly.

Further, in the downward welding cart 21 according to the present embodiment, when welding the butted portion between the large panels W, W, the gantry loader main body 23 having the three

welding torches

26, 26, 26 mounted thereon once. Butt completes the butt joining of the two large panels W, W. For example, compared to the case where butt welding is repeatedly performed with one welding torch, the welding operation time can be further reduced.

In the above-described embodiment, a case where large aluminum alloy panels (welded materials) are joined to each other by the butt welding cart and the butt welding method according to the present disclosure has been described as an example. Not limited to joining.

In the above embodiment, the case where the upward groove for performing the downward welding is the U groove Wu is described as an example, but the upward groove may be the V groove.

The configurations of the butt welding cart and the butt welding method according to the present disclosure are not limited to the configurations of the above-described embodiments.

On the other hand, according to a second aspect of the present disclosure, in a butt welding method in which horizontally supported aluminum alloy workpieces are butt-joined to each other, an upwardly-facing portion formed on an upper surface side in a butt portion between the workpieces is provided. When performing downward welding on a groove, two or more welding torches arranged side by side at a distance on the upward groove at a butt portion between the workpieces are mounted on a downward welding bogie and the upward opening is performed. The welding torch of the two or more welding torches is simultaneously moved along the tip of the welding torch, and is subjected to reverse wave welding for forming a reverse wave bead on the lower surface side of the butted portion between the workpieces. In addition, the welding torch subsequent to the leading welding torch is subjected to build-up welding for filling the upward groove, and the last welding torch of the two or more welding torches. To have a configuration to perform the welding Serve meat for adjusting the appearance to the upwardly open destination.

In the butt welding method according to the second aspect of the present disclosure, for example, in a case where two aluminum alloy workpieces placed side by side on a jig are butt-joined to each other, a distance is set on an upward groove between the workpieces. When two or more welding torches lined up at the same time are mounted on a downward welding bogie and moved simultaneously along an upward groove, the welding torch located at the head in the traveling direction performs uranami welding and Uranami beads are formed on the lower surface side of the butted portion.

Then, the welding torch following the first welding torch performs build-up welding to fill in the upward groove, and the rear welding torch also performs build-up welding to fill in the upward groove to adjust the appearance.
That is, according to this butt welding method, welding of the butted portion of the two materials to be welded to the upper surface and the lower surface can be performed while being mounted on the jig, so that the materials to be welded are not inverted by a crane or the like. As a result, the welding operation time can be shortened accordingly.

At this time, in the butt welding method according to the second aspect of the present disclosure, the butt joining of the two workpieces is completed by one movement of the downward welding bogie equipped with two or more welding torches. (1) The welding operation time can be further reduced as compared with the case where butt welding is repeatedly performed with one welding torch.

21 Downward welding trolley (butt welding trolley)
23 Gantry loader body (trolley body)
26 Welding torch B Uranami beads B1 to B3 Meat W Large panel made of aluminum alloy (welded material)
Wu U groove (upward groove)

Claims

In a butt welding trolley for joining and joining horizontally supported aluminum alloy materials to be welded,
A bogie main body that runs along an upward groove formed on the upper surface side of the butted portion between the workpieces,
It comprises two or more welding torches mounted on the bogie main body and arranged side by side at a distance on the upward groove at the butt portion between the workpieces,
The leading welding torch of the two or more welding torches simultaneously moving along the upward groove by traveling of the bogie main body forms a Uranami bead on the lower surface side at the butted portion between the workpieces. The back torch welding is performed, and the welding torch subsequent to the leading welding torch performs overlay welding to fill in the upward groove, and the last welding torch of the two or more welding torches is the upward facing welding torch. A butt welding trolley that performs welding to fill the meat to adjust the appearance at the bevel.
In a butt welding method of joining and joining horizontally supported aluminum alloy materials to be welded,
When performing downward welding on the upward groove formed on the upper surface side in the butt portion between the workpieces,
Two or more welding torches arranged side by side at a distance on the upward groove at the butt portion between the workpieces are mounted on a downward welding bogie and simultaneously moved along the upward groove.
The forefront welding torch of the two or more welding torches is subjected to backside welding to form a backside bead on the lower surface side at the butted portion between the materials to be welded. The following welding torch is made to perform build-up welding to fill in the upward groove, and the rearmost welding torch of the two or more welding torches is used to adjust the appearance to the upward groove. Butt welding method to perform welding that fills the meat.