JPH10128581A - Single side welding equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a single side welding equipment capable of performing the single side welding of both a thick steel plate to be welded and a thin steel plate to be welded. SOLUTION: A single side welding equipment switches the thin plate mode 20 in which a thin steel plate is welded with the thick plate mode in which a thick steel plate is welded. In the thin steel plate mode 20, thin steel plates 1, 1 to be welded are clamped between holding parts 21b, 21b of L-shaped clamp members 21, 22 fitted to beams 4a, 4b, and a parallel side 3b of a backing copper plate 3a opposite thereto. In the thick plate mode, the thick steel plates 1, 1 to be welded are clamped by the clamp member which is fitted to the beams 4a, 4b and located outside away from the backing copper plate 3a, and the parallel side 3b of the backing copper plate 3a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to one-side welding of a pair of butt-welded steel plates, and more particularly to one-side welding of not only thick steel plates but also thin steel plates. The present invention relates to a single-sided welding device that can be carried out.

[0002]

2. Description of the Related Art As a conventional single-side welding apparatus, Japanese Patent Publication No.
The thing described in 1-7136 gazette is proposed. This type of single-sided welding apparatus is used for single-sided welding of thick steel plates to be welded mainly used for ships and the like.

[0003] In the single-side welding by the conventional single-side welding apparatus, a pair of holding members (beams) for positioning a thick plate to be welded temporarily attached to a steel plate to be welded and clamping the steel plate to be welded. ). Then, by pushing up from the back surface of the thick steel plate to be welded by the backing device mounted on the holding trolley and sufficiently clamping the thick steel plate to be welded with each of the holding members, on one of the holding members. While the mounted welding unit travels along the welding line, the welding head performs one-side welding of a thick steel plate to be welded.

As described above, the reason why the thick steel plate to be welded is clamped from above is to prevent the thick steel plate to be welded from expanding upward and downward due to thermal expansion due to welding with a large heat input. This is to prevent the steel plate to be welded from being lifted by the lifting force of the device. The backing device has a flexible backing copper plate that follows the gentle bending of the thick steel plate to be welded, and improves the adhesion even if the steel to be welded swells upward due to the thermal expansion. The air hose that pushes the rear surface upward has a large stroke, and the air hose is pushed upward from the rear surface to be sustained.

[0005]

By the way, when a conventional single-side welding apparatus is used for single-side welding thick steel plates to be welded, deformation of the thick plate can be appropriately suppressed by the backing device. However, when the thin steel plates to be welded are welded on one side, the following problems occur. That is, since the stroke of the backing device is large as described above, after clamping the thin steel plate to be welded by each pressing member, the backing device is stroked to push up the steel plate to be welded. Deformation that warps upward in a U-shape with respect to the line occurs. As a result, a gap is formed between the welding line to be welded on one side and the backing material, which results in a failure in welding and makes it impossible to perform welding on a thin steel plate to be welded.

In this case, it is also conceivable that the clamp by the pressing members (beams) of the thin steel plate to be welded is pressed as close as possible to the welding line, thereby suppressing the upward deformation of the steel plate to be welded. However, the weight of each pressing member is applied to the thin steel plate to be welded, and conversely, it induces a lower U-shaped deformation.

The single-side welding apparatus of the present invention has been made to solve this problem, and can be used not only for a thick steel plate to be welded but also for a single-side welding of a thin steel plate. It is like that.

[0008]

In order to solve the above-mentioned problems, a single-sided welding device according to the present invention is characterized in that, in the single-sided welding device according to the first aspect, the side ends of a steel plate to be welded are butted on a holding table.
In a single-sided welding apparatus for welding this butt welding line from one side, a backing device having a parallel surface parallel to the steel plate to be welded, which is positioned below the welding line and is capable of ascending and descending, and sandwiches the welding line. The first, which can be moved up and down
A first clamp member and a second clamp member, and a welding device disposed on one of the first clamp member and the second clamp member and capable of traveling along a welding line; A thin plate mode in which the steel plate to be welded is brought into contact with the steel plate in the vicinity of the welding line and presses the steel plate to be welded while facing the parallel surface of the backing device to be raised; The apparatus is provided outside the parallel plane of the apparatus, and is configured to be switchable to a thick plate mode in which the parallel plate of the backing apparatus is lifted to press the steel plate to be welded. Thereby, when clamping the thin steel plate to be welded, the parallel surface of the backing device is raised while the first and second clamp members are in contact with each other near the welding line of the steel plate to be welded. The thin steel plate to be welded can be clamped between the clamp member and each clamp member. Also, when clamping the thick steel plate to be welded, in a state where each clamp member is mounted on the thick steel plate to be welded outside the parallel surface of the backing device, the backing device is raised,
The thick steel plate to be welded can be clamped by this parallel surface and each clamp member.

According to a second aspect of the present invention, there is provided the single-side welding apparatus according to the first aspect, wherein the first clamp member and the second clamp member have sensor means for detecting the steel plate to be welded, and And a control device for stopping the descent when the first clamp member and the second clamp member are in contact with each other. Accordingly, each of the clamp members is stopped in a state in which the clamp unit automatically comes into contact with the steel plate to be welded by the sensor unit detecting the steel plate to be welded.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A single-sided welding apparatus according to an embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows a single-sided welding apparatus according to this embodiment.
As shown in FIG. 2 and FIG.
The first and first clamp beams 4a and 4b and the backing device 3 clamp the steel plates 1 and 1 to be welded without causing warp deformation according to the thickness of the steel plate 1 (thick plate or thick plate). By doing so, the same single-sided welding apparatus can be used for single-sided welding of not only thick steel plates 1 and 1 but also thin steel plates 1 and 1.

In FIGS. 1 and 2, reference numerals 1 and 1 denote opposed thin or thick steel plates to be welded. Reference numeral 2 denotes a holding steel wheel (hereinafter, simply referred to as a holding wheel 2) that holds the steel plates 1 and 1 to be welded. It is composed of The backing device 3 is a thick backing copper plate 3a which is raised and lowered by a predetermined stroke by a lower cylinder 3C and further pressed against the back surface of the steel plates 1 and 1 by an air hose.
The backing copper plate 3a is parallel to the steel plates 1 and 1 to be welded. It has a parallel surface 3b pressed against the clamp beams 4a, 4b.
The parallel surface 3b of the backing copper plate 3a extends in the direction in which the welding line 15 extends, and has flexibility in the direction in which the welding wire 15 extends, so that the steel plate 1, 1 can be pressed. I have. The predetermined width h of the parallel surface 3b of the backing copper plate 3a is a width sufficient to clamp the thin plate and to make close contact with the thin steel plate 1, 1 when the thin steel plate 1, 1 is welded. Has been.

Separate first and second clamp beams 4a and 4b for clamping the steel plates 1 and 1 are provided on the steel plates 1 and 1 respectively. Each clamp beam 4
As shown in FIG. 3, a and 4b extend in parallel with the welding line 15 of the steel plates 1, 1 to be welded. It can be clamped with the copper plate 3A. As shown in FIG. 3, each of the clamp beams 4a and 4b is supported by a pair of beam guides 30 erected at both ends in the extending direction so as to be able to move up and down. Each beam guide 30 is provided with a pair of elevating cylinders 31 and 32 for elevating and lowering the clamp beams 4a and 4b.
1 and 32 are raised and lowered by hydraulic pressure supplied and discharged from each hydraulic circuit 36 based on a command from the control device 35.

5 is a lower portion 4a of the first clamp beam 4a.
1 is a rail carriage capable of horizontal movement in a direction orthogonal to the welding line 15, and a rail along the welding line 15 is mounted on its upper surface, so that the first clamp beam 4 a and the welding line 15 are shifted. If so, the rail is aligned with the welding line 15 in parallel. Reference numeral 6 denotes a welding unit having a plurality of welding heads, which is mounted on a traveling vehicle that travels independently on a rail disposed on the rail vehicle 5. Reference numeral 7 denotes a traveling vehicle (hereinafter, referred to as a “flux vehicle”) on which the welding flux scattering and collecting device 8 is mounted. The traveling vehicle travels on the same rail as the welding unit 6 at the same speed as the traveling speed of the welding unit 6. . The welding unit 6 is provided with a rail carriage 5 together with a feeding device for the welding wire 12.
It is installed in. Reference numeral 10 denotes a traveling carriage (hereinafter referred to as a reel carriage) on which a wire reel 11 is mounted, and travels on the traveling rail 16 of the upper stage 4a2 of the first clamp beam 4a at the same speed as the welding unit 6.

Further, the first and second clamp beams 4a,
4b is a backing copper plate 3 according to the thickness of the steel plates 1 and 1 to be welded.
a, a thin plate mode 2 for clamping the steel plates 1, 1 to be welded
0 or the thick plate mode 25 can be switched to each other. In the thin plate mode 10, as shown in FIG. 1, an L-shaped clamp member 21 is attached to the lower end of the first clamp beam 4a, and an L-shaped clamp member 22 is attached to the lower end of the second clamp beam 4b. , 22 with backing plate 3
a. In the thick plate mode 25, as shown in FIG. 2, the clamp member 23 is attached to the lower end of the first clamp beam 4a, the clamp member 24 is attached to the lower end of the second clamp beam 4b, and both clamp members 23, 24 are connected. It is arranged outside the backing plate 3a symmetrically to the left and right. Reference numeral 19 denotes a second clamp member provided at a position apart from the welding line 15 with respect to the clamp member 23 of the first clamp beam 4a. This presses the welded steel plate 1.

The L-shaped clamp member 21 shown in FIG.
By replacing 22 with the clamp members 23 and 24 in FIG. 2, it is possible to switch from the thin plate mode 20 to the thick plate mode 25.

Further, the thin plate mode 20 of each clamp beam 4a, 4b will be described in detail. As shown in FIG. 1, the pair of L-shaped clamp members 21 and 22 have
1b and 22b are provided as holding plates 21a and 22a. The pressing portions 21b and 22b extend toward the welding line 15 in parallel with the steel plates 1 and 1 to be welded, and face each other within a predetermined width h in which the steel plates 1 and 1 are pressed by the backing copper plate 3a. It can contact the surface of the steel plates 1 and 1 to be welded. Further, each of the holding portions 21b and 22b has a predetermined width h1 having the same dimension in a direction orthogonal to the welding line 15 with the welding line 15 as a center.
At the position of the width h1 <the width h, the thin steel plates 1 and 1 are clamped together with the backing plate 3a while preventing the warping deformation. And each L-shaped clamp member 2
Reference numerals 1 and 22 extend in the direction in which the welding line 15 extends. The steel plates 1 and 1 to be welded can be clamped in the direction in which the welding line 15 extends. The warp deformation of the steel plates 1 and 1 is prevented.

Each of the clamp beams 4a and 4b has
As shown in FIG. 3, a plurality of detection sensors 37 and 38 for detecting the state of each of the L-shaped clamp members 21 and 22 with respect to the steel plates 1 and 1 are provided. Each detection sensor 37,
Numerals 38 are arranged at both ends in the extending direction of the clamp beams 4a, 4b so as to face the steel plates 1, 1 to be welded. It detects the state of proximity or separation (distance) of the steel plate 22b to or from the welded steel plates 1, 1 and outputs it to the control device 35 as a detection signal. The detection sensor 3
As the switches 7, 38, limit switches, contact sensors, laser displacement sensors, and the like are used.

Thus, the control device 35 can control the welded steel plates of the pressing portions 21b and 22b of the L-shaped clamp members 21 and 22 in the thin plate mode 20 based on the detection signals output from the detection sensors 37 and 38. By monitoring the state of proximity or separation (distance) to and from the cylinders 1, 1 and controlling the hydraulic pressure supplied to and discharged from the hydraulic circuits 36 to the lift cylinders 31 and 32 (shown in FIG. 3), especially for thin plates Mode 20
Pressing portions 21b and 22 of L-shaped clamp members 21 and 22 of FIG.
b is brought into contact with the thin steel plates 1 and 1 to be welded.

Next, the thick plate mode 25 of each of the clamp beams 4a and 4b will be described in detail. As shown in FIG. 2, each of the clamp members 23 and 24 is located outside the parallel surface 3 b of the backing copper plate 3 a in a direction orthogonal to the welding line 15, and the rollers 13 a and 13 b The thick steel plates 1 and 1 to be welded are clamped with the backing copper plate 3a. The clamp members 23 and 24 extend in the direction in which the welding line 15 extends, and clamp the steel plates 1 and 1 in the extending direction of the welding line 15.

The single-sided welding apparatus according to the present embodiment is constructed as described above. Next, the procedure for welding thin steel plates 1 and 1 using this single-sided welding apparatus, A procedure for welding the steel plates 1 and 1 will be described.

First, when thin steel plates 1, 1 are to be welded, as shown in FIG. 1, each of the clamp beams 4a, 4b
The L-shaped clamp members 21 and 22 are attached to the lower end of the plate to set the thin plate mode 20.

After the mode is set to the thin plate mode 20, the thin steel plates 1 to be welded are placed on the transfer roller group 3 of the holding cart 2,
The welding line 1 is formed by abutting the side edges of the thin steel plates 1 and 1 to be welded.
5 as well as supplying and discharging hydraulic pressure from each hydraulic circuit 36 to the lifting / lowering cylinders 31 and 32 so that each clamp beam 4a,
4b is lowered to the steel plates 1 and 1 to be welded. During this time, the control device 35 controls the pressing portions 21b, 2 of the L-shaped clamp members 21, 22 based on the detection signals of the detection sensors 37, 38.
The proximity state (distance) between 2b and the thin steel plates 1 and 1 to be welded is monitored.

When the state (distance) of the pressing portions 21b, 22b of the L-shaped clamp members 21, 22 in contact with the thin steel plates 1, 1 is detected by each of the detection sensors 37, 38, the control device 35 The supply and discharge to the lifting cylinders 31 and 32 are stopped. As a result, the lowering of the clamp beams 4a, 4b is stopped, and the welding wire 15 is extended in a state where the pressing portions 21b, 22b of the L-shaped clamp members 21, 22 face the parallel surface 3b of the backing copper plate 3a. It comes into contact with each of the thin steel plates 1 to be welded in the direction.

Next, with the L-shaped clamp members 21 and 22 in contact with the thin steel plates 1 and 1 to be welded, the backing plate 3a is raised by hydraulic pressure toward the steel plates 1 and 1 to be welded. Then, the parallel surface 3b is thinned with an air hose to a thin steel plate 1 to be welded.
, The thin steel plates 1 and 1 to be welded are pushed up. At this time, the thin steel plate to be welded 1,
1 is clamped between the parallel surface 3b of the backing copper plate 3a and the pressing portions 21b and 22b of the L-shaped clamp members 21 and 22 opposed thereto, so that each clamp beam is moved by the stroke of the backing copper plate 3a. Even if it is pushed up to the side 4a, 4b, the above-mentioned curving deformation is regulated by the holding parts 21b, 22b. As described above, when the thin steel plates 1 and 1 to be welded are clamped by the pressing portions 21b and 22b of the opposed L-shaped clamp members 21 and 22 and the parallel surface 3b of the backing copper plate 3a, the above-mentioned curving in a curvilinear manner is obtained. Since the thin steel plates 1 and 1 can be held in a substantially parallel state by restricting the deformation to a minimum, there is no gap between the thin steel plates 1 and 1 and the thin steel plates 1 and 1 can be formed. Can be realized.

After sufficiently clamping the thin steel plates 1 and 1 to be welded as described above, the welding wire 12 is fed from the wire reel 11 to the welding head of the welding unit 6 to prepare for welding. The flux is sprayed from the flux spraying and collecting device 8 toward the welding line 15. Next, the welding unit 6 is moved along the rail mounted on the rail carriage 5 to start welding. At the start of this welding,
The welding wire 12 is continuously fed from the wire reel 11 to the welding head, and the reel carriage 10 and the flash carriage 7 run at the same speed as the welding unit 6.

If the welding unit 6 or the like reaches the end of the welding line 15 while the welding is started and continued as described above, all of them are stopped, and then the clamp beams 4a and 4b are raised and lowered. It is lifted by the cylinders 31 and 32 to be separated from the thin steel plates 1 and 1 to be welded, and the welded thin steel plates 1 and 1 that have been welded are transported on the holding wheel 2 to complete the welding operation. If a thick plate is welded while using the L-shaped clamp members 21 and 22, a large current welding is required, so that the width of the welded bead becomes large and the pressing portion 21
b, the bead approaches to the vicinity of 22b, and the clamp member 2
There is a danger that the members 1 and 22 will be deformed or come into contact by welding heat, and cannot be used for thick plate welding.

Therefore, in order to weld the thick steel plates 1 and 1 on one side, the L-shaped clamp members 21 and 22 are removed from the raised clamp beams 4a and 4b, and as shown in FIG. The mode is switched from the thin plate mode 20 to the thick plate mode 25 by attaching the clamp members 23 and 24.

After switching to the thick plate mode 25, the temporarily attached thick steel plates 1 and 1 to be welded are placed on the transfer roller group 3 of the holding wheel 2 and positioned. Hydraulic pressure is supplied and discharged to 31, 32, and each clamp beam 4a, 4b is lowered to the steel plate 1, 1 to be welded. Then, the clamp members 23 of the clamp beams 4a and 4b,
When 24 is mounted on the thick steel plate 1 to be welded, supply and discharge to the lifting cylinders 31 and 32 are stopped.

Next, with the clamp members 23 and 24 mounted on the thick steel plates 1 and 1 to be welded, the backing copper plate 3a is raised toward the steel plates 1 and 1 to be welded. Is raised toward the back surface of the thick steel plates 1, 1 to push up the thick steel plates 1, 1. At this time, the steel plates 1 and 1 to be welded are parallel surfaces 3b of the backing copper plate 3a.
And the clamp members 23 and 24 mounted on the outside of the backing copper plate 3a, so that even if the backing copper plate 3a is pushed up to the side of each of the clamp beams 4a and 4b by the stroke of the backing copper plate 3a, the thick plate is covered. The parallel surface 3b of the backing copper plate 3a adheres in the direction in which the welding wire 15 extends, without the above-mentioned curving deformation due to the rigidity of the welded steel plates 1 and 1.

As described above, the thick steel plates 1 and 1 to be welded are
Clamp members 23 and 24 located outside the backing copper plate 3a in a direction orthogonal to the welding line 15 and the backing copper plate 3a
Of the thick steel plates 1 and 1 without being deformed due to the rigidity of the thick steel plates 1 and 1 even when clamped between the parallel surface 3b and the rollers 13a and 13b. Can be held in a substantially parallel state. Then, after sufficiently clamping the thick steel plates 1, 1, welding is performed to the end of the welding line 15 in the same manner as the welding of the thin steel plates 1, 1.

In the single-side welding apparatus according to the present embodiment, the switching between the thin plate mode 20 and the thick plate mode 25 is performed by using the L-shaped clamp members 21 and the clamp beams 4a and 4b.
Although the method performed by attaching and removing the clamp members 22 and the clamp members 23 and 24 has been described, the present invention is not limited to this, and the clamp members 23 and 24 may be separated from the L-shaped clamp members 21 and 22 by a plurality of cylinders or the like. The switch between the thin plate mode 20 and the thick plate mode 25 may be automatically performed by advancing and retreating.

[0033]

As described above, according to the single-sided welding apparatus of the present invention, in the single-sided welding apparatus of the first aspect, the thin plate-like welded steel plate is formed by the thin plate mode with each of the clamp members facing the parallel surface of the backing material. When clamped between the thin plates, the pressing force of the thin plate by the backing plate 3A against the steel plate to be welded is regulated by each of the opposing clamp members to minimize the deformation of the steel plate to be welded into an L-shape, Can be realized on the steel plate to be welded. Further, by clamping the thick steel plate to be welded between the plane of the backing material and each of the clamp members in the thick plate mode, welding to the thick steel plate to be welded can be performed as in the related art. As described above, by switching between the thin plate mode and the thick plate mode, it is possible to perform single-side welding of not only a thick plate to be welded but also a thin plate to be welded by using the same single-side welding device.

In the single-sided welding device of the second aspect, in addition to the effect of the first aspect, each clamp member automatically contacts the steel plate to be welded by the control device when the sensor means detects the steel plate to be welded. Since it is stopped in a state of contact, there is no need for a troublesome operation for bringing each clamp member into contact with the steel plate to be welded.

[Brief description of the drawings]

FIG. 1 is a side view illustrating a single-sided welding device and mainly illustrating a configuration of a thin plate pressing portion for sandwiching a thin plate.

FIG. 2 is a side view illustrating a single-sided welding apparatus and mainly illustrating a configuration of a thick plate pressing portion for sandwiching a thick plate.

FIG. 3 is a perspective view showing a single-sided welding apparatus and mainly illustrating a relationship between a lifting cylinder for raising and lowering each beam, a detector, and a control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate to be welded 2 Holding wheel (holding stand) 3 Backing device 3a Parallel surface 4a 1st clamp beam 4b 2nd clamp beam 6 Welding unit 15 Welding line 21,22 L-shaped clamp member 23,24 Clamp member 35 Control device 37, 38 detection sensor

Claims (2)

[Claims] 1. A single-sided welding apparatus for abutting the side ends of a steel plate to be welded on a holding table and welding the butt welding line from one side, wherein the welding unit is located below the welding line and is capable of ascending and descending. A backing device having a parallel surface parallel to a steel plate, a first clamp member and a second clamp member which are arranged to sandwich the welding line and which can move up and down, and one of the first clamp member or the second clamp member And a welding device that is disposed on the upper surface and is capable of traveling along a welding line. The first clamp member and the second clamp member are in contact with the steel plate to be welded in the vicinity of the welding line and are raised. A thin plate mode in which the steel plate to be welded is pressed between the parallel surface of the backing device and a parallel plate of the backing device which is mounted on the steel plate to be welded outside the parallel surface of the backing device and rises; Surface and the steel to be welded A single-side welding apparatus characterized in that it can be switched to a thick plate mode for pressing a plate. 2. The steel plate according to claim 1, wherein the first and second clamp members have sensor means for detecting the steel plate to be welded, and the steel plate to be welded has the first clamp member and the second clamp member. A single-sided welding device provided with a control device for stopping the descent in a contact state.