JP2001138087A - Welding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a welding method to sufficiently prevent the welding distortion by appropriately reducing the residual heat in the welding by a simple means in a metal plate to be welded. SOLUTION: When a stiffener 2 is fillet-welded 6 to a relatively thin steel plate 1 by a welding torch 3 in a shipbuilding industry, a reverse side of the steel plate 1 is cooled by a cooling means such as spraying cooling water 5 from a nozzle 4 in order to prevent the distortion caused by the residual heat.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a welding method suitable for welding a stiffener or the like to a relatively thin steel plate in the construction of ships such as passenger ships, ships and high-speed ships.

[0002]

2. Description of the Related Art Conventionally, in a welding method for a thin steel plate,
As shown in FIG. 11, when the stiffener 2 is welded to the steel sheet 1, the steel sheet 1 is not deformed after welding.
Is fixed by a restraining jig 19 in advance, and then welding is performed by a welding torch (welding rod) 3. Further, in order to reduce heat input during welding, a construction method using laser welding is also being implemented. However, the conventional method has the following disadvantages. In the former method, welding deformation can be reduced to some extent as compared to the case without restraint, but it is difficult to reduce the deformation to below the amount that can be satisfied as a product, and at present, a huge number of man-hours for removing deformation by pressing and annealing are required. is needed.
In the latter method using laser welding, equipment costs are high and there is a problem in cost.

[0003]

SUMMARY OF THE INVENTION Accordingly, the present invention has been made to sufficiently reduce distortion after welding by making it possible to appropriately reduce residual heat during welding in a metal plate to be welded by simple means. It is an object of the present invention to provide a welding method capable of preventing such a problem.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the welding method of the present invention is intended to reduce the residual deformation of a metal sheet when welding a metal material to one surface of the sheet.
In order to reduce the residual heat at the time of welding, a coolant is applied to the other surface of the thin plate.

Further, in the welding method of the present invention, when welding a steel stiffener to one surface of a steel sheet, the welding torch is moved along the stiffener to perform fillet welding, and Is characterized in that the refrigerant jet nozzle is sequentially moved to the steel plate surface on the back side of the welded portion immediately after passing through to jet the refrigerant.

Further, the welding method according to the present invention is characterized in that a sprayer for spraying atomized cooling water is used as the refrigerant ejection nozzle.

Further, according to the welding method of the present invention, when a steel stiffener is welded to one surface of a steel sheet, an opening edge of a casing which is in advance parallel to the stiffener is provided on the other surface of the steel sheet. The parts are brought into close contact with each other, and a coolant is caused to flow into the casing during the welding.

Further, according to the welding method of the present invention, when a steel stiffener is welded to one surface of a steel plate, the steel stiffener is brought into contact with the other surface of the steel plate in advance in parallel with the stiffener. A pipe having a heat-transfer wall closely attached is attached, and a refrigerant is caused to flow into the pipe during the welding.

In addition, according to the welding method of the present invention, when welding a steel stiffener to the upper surface of a steel plate, a frame-shaped fence surrounding the entire circumference of the steel plate in a liquid-tight manner is provided in advance. The fence is housed in a container, and the lower surface of the steel plate is supported so as to be separated from the inner bottom surface of the container. When welding the stiffener on the steel plate, the lower surface of the steel plate is placed in the container. It is characterized in that it is cooled by a refrigerant liquid.

In the welding method of the present invention described above, when a metal material such as a stiffener is welded to one surface of a thin metal plate, the other surface of the thin plate is cooled by a refrigerant and the residual heat during welding is welded. Therefore, the occurrence of distortion in the thin plate after welding can be sufficiently prevented without hindering the welding operation.

When a steel stiffener is welded to one surface of a steel plate, for example, when building a ship, fillet welding of the stiffener to the steel plate is performed by moving a welding torch along the stiffener. Immediately after passing the welding torch, the refrigerant is sprayed onto the steel sheet surface from the refrigerant jet nozzle that moves along the steel sheet surface behind the welded part, thereby reducing the residual heat during welding. Thus, deformation of the steel sheet after welding can be prevented by simple and inexpensive means.

When a sprayer for spraying atomized cooling water is used as the coolant jetting nozzle, the removal of welding heat can be easily adjusted as compared with the case of liquid cooling water, so that more effective welding residual deformation can be achieved. Prevention becomes possible.

Further, when welding a steel stiffener to one surface of a steel plate, an opening edge portion of a casing adjacent to the other surface of the steel plate in parallel with the stiffener is brought into close contact with the steel plate in advance. When a coolant such as cooling water is caused to flow into the casing during the welding, the reduction of welding residual heat is significantly simplified, and the coolant is prevented from being scattered or dissipated. Since the casing can be used repeatedly, deformation of the steel sheet after welding the stiffener can be prevented at low cost.

Further, a pipe is used in place of the casing, and a heat transfer wall closely attached to the steel plate of the pipe is used.
When the residual heat of welding is reduced by a coolant such as cooling water flowing into the pipe, required operations are further simplified, and a sufficient effect of preventing deformation of the steel sheet after welding of the stiffener is obtained. .

Further, when welding the steel stiffener to the upper surface of the steel sheet, a frame-like fence is provided in advance to surround the entire circumference of the steel sheet in a liquid-tight manner, and the steel sheet is housed in a container together with the steel sheet. In the welding method, the lower surface is supported so as to be separated from the inner bottom surface of the container, and when the stiffener is welded on the steel plate, the lower surface of the steel plate is cooled by the refrigerant liquid in the container. Because the above steel sheet can be cooled in places other than where welding is being performed, the welding residual deformation can be more reliably reduced, and moreover, a plurality of stiffeners can be simultaneously formed by a plurality of welding torches at the same time. There is also.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing the construction of a first embodiment of the present invention by a welding method, and FIG. FIG. 3 is a perspective view showing a construction state by a welding method according to a second embodiment of the present invention, FIG. 4 is a view taken along the line BB of FIG. 3, and FIG. 5 is a third embodiment of the present invention. FIG. 6 is a perspective view showing the state of construction by the welding method as an example, and FIG.
FIG. 7 is a perspective view showing the state of construction by the welding method according to the fourth embodiment of the present invention, FIG. 8 is a DD view of FIG. 7, and FIG. 9 is a fifth embodiment of the present invention. FIG. 10 is a perspective view showing the state of construction by the welding method as shown in FIG.

First, a welding method according to a first embodiment of the present invention will be described. As shown in FIGS.
When welding a steel stiffener 2 as a metal material to one surface of a steel plate 1 as a thin metal plate, a welding torch (welding rod) 3 is moved along the stiffener 2 to perform fillet welding 6. Immediately after passing through the welding torch 3, an operation is performed in which the coolant jet nozzle 4 is sequentially moved to the steel plate surface on the back side of the welded portion to spray cooling water as a coolant.

At this time, by considering the thickness of the steel sheet 1, the thickness of the stiffener 2 and the welding heat input, the position of the coolant ejection nozzle 4 and the amount of cooling water are adjusted to minimize the welding deformation of the steel sheet 1. The cooling operation is performed under the following conditions.

According to the welding method described above, the residual heat after welding can be immediately removed, and the plastic region of the steel sheet 1 due to the heat input during welding is reduced, and as a result, the residual deformation of the flat plate is reduced. . Also, compared to conventional laser welding,
The equipment is simple and can be implemented at low cost.

When the stiffener 2 as a metal material is welded to one surface of the steel plate 1 as a thin metal plate,
On the other side, the effect of reducing the residual heat of the welding by spraying the cooling water is performed, so that there is obtained an advantage that the welding operation is not hindered. In addition, as the refrigerant jetted from the refrigerant jet nozzle 4, low-temperature air or the like can be used.

Next, a welding method according to a second embodiment of the present invention will be described. As shown in FIGS.
When welding the steel stiffener 2 to one surface of the steel plate 1, also in the present embodiment, immediately after passing the welding torch 3 while moving the welding torch 3 along the stiffener 2 and performing the fillet welding 6. In the second embodiment, a sprayer 7 for jetting mist cooling water 8 is used as a refrigerant jet nozzle in the second embodiment.

As described above, in the second embodiment, the same operation and effects as those of the first embodiment can be obtained. However, in the second embodiment, the mist-like cooling water 8 is used as the refrigerant ejection nozzle. Is used because the sprayer 7 that ejects
Adjustment of the removal of welding heat is easier than in the case of liquid cooling water, and more effective prevention of welding residual deformation becomes possible.

Next, a welding method according to a third embodiment of the present invention will be described. As shown in FIGS.
When the steel stiffener 2 is attached to one surface of the steel plate 1 by using the welding torch 3 by fillet welding 6, an opening of the casing 9 which is previously in parallel with the stiffener 2 on the other surface of the steel plate 1. The edges are brought into close contact with each other via a sealing material (not shown). At the time of welding, a coolant such as cooling water is introduced into the casing 9 through the coolant injection nozzle 10 and discharged from the coolant discharge nozzle 11, thereby reducing welding residual heat. An operation is performed. In addition, you may make it flow into the casing 9 using cooled air etc. as a refrigerant | coolant.

As means for pressing the opening edge of the casing 9 against the steel plate 1, a means for pressing the edge of the steel plate 1 with a clamp device or pressing with a magnet is used.

In the welding method according to the third embodiment described above, since the refrigerant is introduced using the casing 9, the reduction of the residual heat of welding can be performed extremely easily, and the cooling water can be easily dispersed. In addition to preventing the dissipation, the casing 9 can be used repeatedly, so that the deformation of the steel plate 1 after welding the stiffener 2 can be prevented at low cost. In addition,
As a material of the casing 9, a plastic material can be used in addition to a metal material.

Next, a welding method according to a fourth embodiment of the present invention shown in FIGS. 7 and 8 is such that a pipe 12 is used instead of the casing 9 in the third embodiment described above. When a steel stiffener 2 is attached to one surface by a fillet weld 6 using a welding torch 3, a pipe which is previously adjacent to the other surface of the steel plate 1 in parallel with the stiffener 2.
12 is attached so that the heat transfer wall 12a is brought into close contact with the steel plate 1. At the time of welding, a coolant such as cooling water is put into the pipe 12 through the coolant injection nozzle 13 and discharged from the coolant discharge nozzle 14. An operation is performed to reduce the residual welding heat. Also in this case, cooled air or the like can be used as the refrigerant. As a means for pressing the opening edge of the pipe 12 against the steel sheet 1, a means for using a clamping device at the edge of the steel sheet 1 or pressing with a magnet is used.

In the case of the welding method according to the fourth embodiment,
Since the inflow of the refrigerant is performed using the pipe 12, the reduction of the residual heat of welding can be performed remarkably easily, the cooling water is prevented from being scattered, and the refrigerant is prevented from being dissipated.
Since 12 can be used repeatedly, deformation of the steel plate 1 after welding of the stiffener 2 can be prevented at low cost. Although a metal material is used as the material of the pipe 12, the heat transfer wall 12a
Other than the above, a plastic material can be used.

Next, a welding method according to a fifth embodiment of the present invention will be described. As shown in FIGS. 9 and 10, a steel stiffener 2 is formed by using a welding torch 3 on the upper surface of a steel plate 1.
When the steel plate 1 is attached by fillet welding, a frame-shaped fence 15 that surrounds the entire circumference of the steel plate 1 in a liquid-tight manner is provided in advance.
The steel plate 1 and the steel plate 1 are accommodated in a container 17 filled with a refrigerant liquid (water, oil, etc.) 18, and the steel plate 1 is supported by a support 16 so as to separate the lower surface of the steel plate 1 from the inner bottom surface of the container 17. Is supported. Note that instead of using the support 16, support legs may be provided on the frame-shaped fence 15.

As described above, the lower surface of the steel plate 1 is supported so as to be separated from the inner bottom surface of the container 17, and the lower surface of the steel plate 1 is held in the container 17 when welding the stiffener 2 on the steel plate 1. In the welding method in which the cooling is performed by the refrigerant liquid, since the steel plate 1 can be cooled in a portion other than the portion where the welding is being performed, the welding residual deformation can be reduced more reliably.
There is also an advantage that a plurality of stiffeners 2 can be simultaneously formed by a plurality of welding torches 3 at the same time.

[0030]

As described above, according to the welding method of the present invention, the following effects can be obtained. (1) When welding a metal material, such as a stiffener, to one surface of a thin metal plate, the other surface of the thin plate is cooled by a refrigerant to reduce residual heat during welding. The occurrence of distortion in the thin plate after welding can be sufficiently prevented without any trouble. (2) When welding a steel stiffener to one side of a steel sheet, the fillet welding of the stiffener to the steel sheet is performed by moving a welding torch along the stiffener. Immediately after passing the torch, the refrigerant is sprayed onto the steel sheet surface from the refrigerant ejection nozzle that moves along the steel sheet surface on the back side of the welded part, so that the residual heat during welding is accurately reduced. Deformation in the steel sheet after welding can be prevented by simple and inexpensive means. (3) When a sprayer that sprays mist cooling water is used as the refrigerant spray nozzle, it becomes easier to adjust the removal of welding heat than in the case of liquid cooling water, and more effective prevention of welding residual deformation. Becomes possible. (4) When welding a steel stiffener to one surface of a steel plate, an opening edge of a casing adjacent to the other surface of the steel plate in parallel with the stiffener is brought into close contact with the other surface of the steel plate, and the welding is performed. If a coolant such as cooling water is allowed to flow into the casing at the time of construction, the reduction of welding residual heat will be performed extremely easily, and cooling water will be prevented from escaping or being dissipated,
Since the casing can be used repeatedly, the deformation of the steel plate after welding the stiffener can be prevented at low cost. (5) Using a pipe instead of the casing, through a heat transfer wall closely attached to the steel plate of the pipe, and reducing welding residual heat with a coolant such as cooling water flowing into the pipe,
The required operation is further simplified, and a sufficient effect of preventing deformation of the steel sheet after welding the stiffener is obtained. (6) When welding a steel stiffener to the upper surface of a steel sheet, a frame-shaped fence is provided in advance to surround the entire circumference of the steel sheet in a liquid-tight manner, and the steel sheet is housed in a container together with the steel sheet. The welding method, which is supported so as to be separated from the inner bottom surface of the container, when welding the stiffener on the steel plate, so that the lower surface of the steel plate is cooled by the refrigerant liquid in the container, Since the steel plate can be cooled in places other than where welding is being carried out, residual deformation of welding can be more reliably reduced, and there is also the advantage that multiple stiffeners can be applied simultaneously with multiple welding torches. .

[Brief description of the drawings]

FIG. 1 is a perspective view showing a construction state by a welding method as a first embodiment of the present invention.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a perspective view showing a construction state by a welding method according to a second embodiment of the present invention.

FIG. 4 is a view taken in the direction of arrows BB in FIG. 3;

FIG. 5 is a perspective view showing a construction state by a welding method according to a third embodiment of the present invention.

6 is a view taken in the direction of the arrows CC in FIG. 5;

FIG. 7 is a perspective view showing a construction state by a welding method according to a fourth embodiment of the present invention.

FIG. 8 is a view as seen in the direction of arrows DD in FIG. 7;

FIG. 9 is a perspective view showing a construction state by a welding method according to a fifth embodiment of the present invention.

FIG. 10 is a view as seen in the direction of arrows EE in FIG. 9;

FIG. 11 is a perspective view showing a construction state by a conventional welding method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel plate 2 Stiffener 3 Welding torch (welding rod) 4 Refrigerant ejection nozzle 5 Cooling water 6 Fillet welding 7 Sprayer 8 Atomized cooling water 9 Casing 10 Refrigerant injection nozzle 11 Refrigerant discharge nozzle 12 Pipe 12a Heat transfer wall 13 Refrigerant injection Nozzle 14 Refrigerant discharge nozzle 15 Frame fence 16 Support 17 Vessel 18 Refrigerant liquid 19 Restraining jig

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshiaki Inoue 5-7-17-1 Fukahori-cho, Nagasaki-shi In Nagasaki Research Laboratory, Mitsubishi Heavy Industries, Ltd. (72) Inventor Junji Wakiyama 1-1-1, Akunoura-cho, Nagasaki-shi Mitsubishi Heavy Industries F-term in Nagasaki Shipyard Co., Ltd. (reference) 3J023 EA02 FA01 GA02

Claims (6)

[Claims] When a metal material is welded to one surface of a thin metal plate, a refrigerant is applied to the other surface of the thin metal plate in order to reduce residual heat during welding. A welding method characterized by being applied. 2. When welding a steel stiffener to one surface of a steel sheet, a welding torch is moved along the stiffener to perform fillet welding, and a welded portion immediately after passing through the welding torch is formed. A welding method characterized by sequentially moving a coolant ejection nozzle onto a steel plate surface on the back side to spray coolant. 3. The welding method according to claim 2, wherein a sprayer for jetting atomized cooling water is used as the refrigerant jet nozzle. 4. When welding a stiffener made of steel to one surface of a steel plate, an opening edge of a casing adjacent to the other surface of the steel plate in parallel in parallel with the stiffener is brought into close contact with the stiffener in advance. A welding method, wherein a refrigerant is caused to flow into the casing at the time of construction. 5. When welding a stiffener made of steel to one surface of a steel plate, the other surface of the steel plate has a heat transfer wall which is previously in parallel with the stiffener and closely adhered to the steel plate. Attach the pipe,
A welding method, wherein a refrigerant is caused to flow into the pipe during the welding. 6. When welding a steel stiffener to the upper surface of a steel plate, a frame-shaped fence surrounding the entire circumference of the steel plate in a liquid-tight manner is provided in advance, and the steel plate and the frame-shaped fence are housed in a container. Then, the lower surface of the steel plate is supported so as to be separated from the inner bottom surface of the container, and when welding the stiffener on the steel plate, the lower surface of the steel plate is cooled by a refrigerant liquid in the container. Characterized by the welding method.