JPH11226782A - Welding working method and travelling device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding working method, with which the working efficiency can be improved and the stable welded quality can be secured in the case of executing the arc welding after executing gouging, such as both surface butt joint. SOLUTION: A plasma gouging torch is fitted to a travelling truck 20 and firstly, a welding line or the neighborhood thereof are gouged to form a gouging groove. Successively, a gas metal arc welding torch 30 is fitted by changing the plasma gouging torch, and the gouging groove is welded while travelling the travelling truck 20 on the above focus. At the time of starting the welding, the arc welding torch 30 is shifted along the gauging groove by matching the arc welding torch 30 to the gouging groove. In this result, the gouging work and the arc welding work with the same device can be automatized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method, and more particularly, to a double-sided butt welding, after performing welding from one side, performing gouging from the back side, and further performing back side welding. The present invention relates to a welding method capable of improving work efficiency and welding quality when performing gas metal arc welding. The present invention also relates to a traveling device suitably used for such welding work.

[0002]

2. Description of the Related Art In double-sided butt welding, as shown in FIG. 6, first, a pair of base materials 1 and 2 having a predetermined groove formed thereon are butt-connected, and the front side is welded. (FIG. 6A) Then, gouging is performed from the back side as shown in FIG. 6B, and the gouging groove 3 formed on the back side is thereby welded as shown in FIG. 6C. ing. Applying gouging on the back side in this way is that in the first-layer welding layer on the front side, welding defects such as poor penetration and blowholes are likely to occur in the root portion, so these defects are deleted in advance. That's why.

[0003]

The above gouging is conventionally performed by arc air gouging. This arc air gouging uses a consumable carbon rod, and since the consumption rate of the carbon rod is extremely high, it is extremely difficult to automate the operation.Therefore, the above gouging has conventionally been performed manually. I have. Further, as described above, gouging is performed manually, and as a result, the gouging groove formed thereby has a great change in groove width and depth, and therefore, arc welding of this portion also has to be performed manually. . As described above, the conventional double-sided butt welding method has a disadvantage that it requires a great deal of trouble, and the quality of the obtained welded joint is not always satisfactory.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to improve the work efficiency in the case where arc welding is performed after gouging, for example, as in a double-sided butt joint. It is an object of the present invention to provide a welding method capable of improving welding quality and ensuring stable welding quality. It is also an object of the present invention to provide a traveling device that can be suitably used in such welding work.

[0005]

Therefore, in the welding method according to the first aspect of the present invention, a plasma gouging torch is mounted on a traveling vehicle traveling on a predetermined locus along a welding line formed between the workpieces. First, gouging the welding line and its vicinity to form a gouging groove, then installing a gas metal arc welding torch instead of the plasma gouging torch, and moving the traveling bogie along the same locus as above to form the gouging groove. It is characterized by welding.

[0006] In the above welding method, the gouging operation is automated by using plasma gouging. This plasma gouging uses a plasma flame ejected from a non-transfer type plasma arc torch as a heat source. In this plasma gouging method, gouging can be performed by moving the torch while keeping the distance between the torch and the base material constant while making the torch an advancing angle, so that the work can be automated. And the gas metal arc welding work following the gouging work is performed by changing the plasma gouging torch to the arc welding torch, but at this time, the arc welding torch is
It moves along the same trajectory as the plasma gouging torch. Therefore, if the arc welding torch is made coincident with the gouging groove at the start of welding, the arc welding torch moves on the gouging groove along the gouging groove. As a result, the gouging operation and the arc welding operation can be automated using the same device. Moreover, in the gouging groove obtained by plasma gouging, the groove width and depth are stable, and the arc welding torch is correctly positioned with respect to the gouging groove.
Good welding quality is obtained.

The welding method according to claim 2 is characterized in that the welding line is a welding line formed on the back side of the first-layer welding layer when performing full penetration type double-sided welding. .

The method of claim 1 is not limited to double-sided butt welding, but can be applied to various welded joints that require a gouging operation prior to welding.
When applied to double-sided butt welding as described above, a particularly remarkable effect is obtained.

The traveling apparatus according to a third aspect of the present invention comprises a rail disposed along a welding line, and a traveling vehicle guided and guided by the rail, wherein the traveling vehicle includes a plasma gouging torch and a gas metal arc welding. A torch mounting portion capable of being exchangeably mounted with a torch is provided.

The traveling device is suitable for carrying out the welding method according to the first and second aspects.

According to a fourth aspect of the present invention, there is provided a traveling device comprising a rail arranged along a welding line, and a traveling vehicle guided and guided by the rail, wherein the traveling vehicle has a drive source comprising a servomotor. It is characterized by.

Here, a characteristic point is that a servomotor is used as a drive source of the traveling vehicle. The reason for using the servo motor in this way is as follows. That is, when implementing the method of claim 1 or claim 2, while plasma gouging requires a speed of 1000 mm or more per minute, in arc welding, for example, about 70 mm per minute in upright ascent Therefore, the traveling vehicle needs a very wide speed range, such that the welding speed needs to be set at a certain speed. Such a wide speed range cannot be achieved by an induction motor conventionally used as a drive source of a traveling carriage for welding, but can be achieved only by employing a servomotor as described above. In addition, when the arc welding posture is vertical and upward, the traveling device requires a very large driving torque, and such a request can be achieved for the first time by the servomotor.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, specific embodiments of the welding method and the traveling apparatus for the same according to the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a state in which a container ship side outer plate is butt-welded on both sides. In FIG.
Numerals 1 and 52 denote shear strakes, and numerals 53, 54 and 55 denote side outer plates. Then, the welding lines 56 formed in the respective portions and extending in the vertical direction are welded. As shown in the figure, a rail 10 extending in the vertical direction substantially in parallel with the welding line 56 is provided outside the shear strakes 51, 52 and the side outer plates 53, 54, 55,
A traveling carriage 20 is mounted on the rail 10.
The rail 10 and the traveling vehicle 20 constitute a traveling device. In the drawing, a state in which a gas metal arc welding torch 30 is attached to each traveling vehicle 20 is illustrated, and in this case, vertical upward welding is performed. Although the figure shows an example in which a plurality of traveling devices are installed, a single traveling device may be used to perform welding work in order from the bottom to the top, or As described above, a plurality of traveling devices may be used to perform welding operations at a plurality of locations simultaneously and in parallel.

FIG. 2 schematically shows, on an enlarged scale, a state in which a gas metal arc welding torch 30 is attached to the traveling apparatus. The rail 10 is attached to the shear stroke 51 or the side outer plate 53 by magnets 11, 11, and the traveling carriage 20 is provided with an arc welding torch 30 via an oscillator 21.
The oscillator 2 to which the arc welding torch 30 is attached
Reference numeral 1 is detachable from the traveling carriage 20 by a simple operation, as described later. Also, the controller 22 of the traveling vehicle 20 and the oscillator 21 is detachable from the traveling vehicle 20. In FIG. 2, the controller 22 is detached from the traveling vehicle 20 and can be operated from the lifting device 23. FIG. The oscillator 21 has a function of causing the arc to reciprocate in a direction orthogonal to the welding line 56.

FIGS. 3 and 4 show the traveling device in detail. This is a state where the controller 22 is attached to the traveling vehicle 20. First, a box-shaped controller 22 is mounted on one side of a bogie main body 24 of the traveling bogie 20, and a torch position adjusting unit 2 is mounted on the other side.
5 are provided. The torch position adjusting section 25 includes a torch mounting section 26 at the tip thereof to which an arc welding torch 30 and a plasma gouging torch (not shown) are selectively mounted.
, The position of the torch mounting portion 26 can be adjusted in the height direction of the welding line 56 by operating the handle 28. In FIGS. 3 and 4, reference numeral 29 denotes a torch replacement handle, 31 denotes a truck transport handle, and 32 denotes a controller transport handle.

In the traveling apparatus as described above, first, FIG.
5, the rail 10 is installed at a predetermined position, and then, as shown in FIG. 5, the handle 29 of the traveling vehicle 20 is operated to attach the mounting rod 33 a of the plasma gouging torch mounting arm 33 to the torch mounting part 26. Attachment, and further, a plasma gouging torch (not shown) is attached to the distal end 33 b of the attachment arm 33. And handle 2
After the position of the torch is adjusted by operating 7, 28, the gouging groove 3 is formed in the portion including the root portion on the back side of the first welding layer as shown in FIG. 6B. This gouging is performed while moving the plasma gouging torch downward (downward movement). When the gouging of a predetermined length is completed, the torch replacement handle 29 is operated again to remove the plasma gouging torch together with the plasma gouging torch mounting arm 33, and as shown in FIG. 2
1a is attached to the torch attachment part 26, and the oscillator 2
The arc welding torch 30 is attached to the front end portion 21b of the first. After the position of the arc welding torch 30 is adjusted by the handles 27 and 28, the portion including the gouging groove 3 formed as described above is welded by vertical upward welding.

In the above welding method, the gouging operation is automated by using plasma gouging. This plasma gouging uses a plasma flame ejected from a non-transfer type plasma arc torch as a heat source. In this plasma gouging method, gouging can be performed by moving the torch while keeping the distance between the torch and the base material constant while setting the torch at an advancing angle. Thus, the work can be automated. The arc welding work subsequent to the gouging work is performed by changing the plasma gouging torch to the arc welding torch 30. At this time, the arc welding torch 30 moves along the same locus as the plasma gouging torch. Therefore, at the start of welding, if the arc welding torch 30 is made to coincide with the gouging groove 3 by operating the handles 27 and 28, the arc welding torch 30 moves on the gouging groove 3 along the gouging groove 3. As a result, the gouging operation and the arc welding operation can be automated by the single traveling vehicle 20. Moreover, in the gouging groove 3 obtained by plasma gouging, the groove width and the depth are stable, and the arc welding torch 30 is correctly positioned with respect to the gouging groove 3, so that good welding quality can be obtained.

The features of the traveling carriage 20 are as follows.
A small servomotor (not shown) is used as the driving source. The reason for using a servo motor in this way is that
For the following reasons: That is, when performing the above welding method, 1000 m in plasma gouging
In contrast to the need for a speed of m / min or more, in the case of arc welding, for example, in the case of a vertical climb, a welding speed of about 70 mm / min is required. Requires a wide speed range.
Such a wide speed range cannot be achieved by an induction motor conventionally used as a drive source of a welding traveling vehicle, and conventionally two traveling vehicles were required. On the other hand, in this embodiment, by employing the servomotor as described above, it is possible to cover a wide range of speed with one traveling vehicle 20. In addition, when the arc welding posture is vertical and upward, the traveling device requires a very large driving torque, but such a request can be achieved only by employing the servomotor. .

In the traveling trolley 20, the traveling speed of the trolley is preset input to the motor driver, and is selected by the selection switch 34, thereby obtaining the three speeds.
It is possible to switch between stages (for example, gouging / welding / idling) to facilitate speed selection. In a region where fine adjustment of the speed during running is required, fine adjustment can be made with a volume 36 by a preset / manual changeover switch 35. Further, the range in which fine adjustment is possible is also set in two ways (0 to 100 mm /
Min and 0-600 mm / min) are selectable,
It can handle vertical welding and downward / lateral welding.

According to the above welding method, the changeover operation during gouging / welding can be performed only by the torch changing operation, and the stable and uniform gouging groove 3 can be formed by plasma gouging, so that patterning of welding conditions is easy. Suitable for automation. Also, if limit switches and dogs are provided on the traveling vehicle 20 and the rails 10 to provide a function of stopping both ends of the joint, operation of two long joints per person becomes possible, and the number of man-hours can be greatly reduced.

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and can be implemented with various modifications. For example, in the above,
Although a plasma gouging method using a plasma flame ejected from a non-transfer type plasma arc torch as a heat source is used, a transfer type plasma arc torch may be used in some cases. As the gas metal arc welding in the above, a gas using carbon dioxide gas as a shielding gas or a gas using argon gas (and carbon dioxide gas) may be used.

[0023]

According to the welding method according to the first and second aspects, the gouging operation and the gas metal arc welding operation can be automated using one traveling vehicle. When arc welding is performed after gouging as in a butt joint, work efficiency can be improved, and stable welding quality can be ensured.

According to the third and fourth embodiments of the present invention, the welding traveling apparatus is suitable for carrying out the above-described welding method.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an application example of an embodiment of a welding method and a traveling apparatus according to the present invention.

FIG. 2 is an enlarged perspective view schematically showing the traveling device according to the embodiment.

FIG. 3 is a plan view showing in detail a state in which an arc welding torch is mounted in the traveling device.

FIG. 4 is a side view of the traveling device.

FIG. 5 is a plan view showing in detail a state in which a plasma gouging torch is mounted in the traveling device.

FIG. 6 is a cross-sectional view showing a welding process in the welding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Rail 20 Traveling trolley 26 Torch attachment part 30 Arc welding torch

[Procedure amendment]

[Submission date] February 12, 1999

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 3

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction contents]

Further, the traveling device according to claim 3 is the traveling device according to claim 1.
A welding method for carrying out the welding method according to claim 1 or 2.
A traveling device for construction, comprising a rail arranged along a welding line, and a traveling truck guided and traveled by the rail, wherein the traveling truck includes a plasma gouging torch and a gas metal arc welding torch. It is characterized in that it comprises a torch mounting part that can be exchangeably mounted.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0011

[Correction method] Change

[Correction contents]

According to a fourth aspect of the present invention, there is provided the traveling device according to the first aspect.
A welding method for performing the welding method according to claim 2.
A traveling device, comprising: a rail arranged along a welding line; and a traveling vehicle guided and guided by the rail, wherein the traveling vehicle includes a drive source including a servomotor. -End-

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Toshimitsu Araki 3-1-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Plant (72) Inventor Hiroyuki Wada 3-1-1 Higashikawasakicho, Chuo-ku, Kobe-shi No. 1 Kawasaki Heavy Industries, Ltd., Kobe Plant (72) Inventor Eiichi Yagi 1-1, Kawasaki-cho, Akashi-shi, Hyogo Prefecture Kawasaki Heavy Industries, Ltd. Inside Akashi Plant (72) Inventor, Shigekazu Shioda 1, Kawasaki-cho, Akashi-shi, Hyogo No. 1 Kawasaki Heavy Industries, Ltd.Akashi Plant Co., Ltd. Inside the Sakaide factory

Claims (4)

[Claims] 1. A plasma gouging torch is mounted on a traveling vehicle that travels along a predetermined locus along a welding line formed between materials to be welded, and the welding line and its vicinity are first gouged to form a gouging groove. And then mounting a gas metal arc welding torch in place of the plasma gouging torch, and welding the gouging groove while running the traveling trolley along the same locus as described above. 2. The welding construction method according to claim 1, wherein the welding line is a welding line formed on the back side of the first-layer welding layer when performing a full penetration type double-sided welding. 3. A rail arranged along a welding line, and a traveling carriage guided and guided by the rail,
The traveling device for welding work, wherein the traveling vehicle includes a torch mounting portion to which a plasma gouging torch and a gas metal arc welding torch can be exchangeably mounted. 4. A rail arranged along a welding line, and a traveling carriage guided and guided by the rail,
The traveling device for welding work, wherein the traveling vehicle includes a drive source including a servomotor.