JP3233782B2 - Horizontal automatic welding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention
The present invention relates to a horizontal automatic welding method applied to the joining of a steel plate having a large thickness disposed above and below.

[0002]

2. Description of the Related Art Conventionally, a steel plate having a plate thickness of 25 mm or more disposed above and below a ship-side outer plate or the like is welded by (1) as shown in FIG. The lower end (groove) shape
Approximately 40 ° from horizontal to upper, from the back of the steel plate to the front
The upper plate (groove) of the lower plate 02 is formed to have a horizontal shape, and the upper plate (groove) of the lower plate 02 is made horizontal. 03, after the front dressing material 04 is fixed to the front side, respectively, (3) the horizontal automatic welding device is moved along the welded portion 05 in the direction of the arrow in FIG. Are performed in a multi-pass welding method in which the molten metal 06 is gradually stacked in the order shown by.

In FIG. 7B, the molten metal 06 is shown only halfway through the welded portion 05 for easy understanding.
Each molten metal 06 shown in (a) to (i) is welded to the entire length of the welded portion.

[0004] The adoption of this multi-pass welding method is because the above-mentioned groove angle is large, and in the conventional welding method, the molten metal 06 precedes in the welding advancing direction, and it is difficult to control the molten metal 06 by a welding torch. Due to the large heat input in the thickness direction, it is difficult to fix a large amount of molten metal 06 to the joint with a small number of weldings and a small number of weldings, and welding defects are likely to occur. I have.

For this reason, it takes much time to return the horizontal automatic welding apparatus to the welding start point and to move it in the direction opposite to the arrow in FIG. There is a problem that the time required for the removal is required, and the welding time is prolonged.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a horizontal automatic welding method which can solve the above-mentioned problems of the conventional welding method and can reduce the number of welding passes to shorten the welding time. Make it an issue.

[0007]

SUMMARY OF THE INVENTION The present invention relates to a horizontal automatic welding method for performing welding between an upper plate and a lower plate held in an up-and-down state by using a horizontal automatic welding apparatus. In order to solve the problem, ・ The groove shape for welding the upper plate should be 10-1 from the horizontal plane.
The groove shape for welding the lower plate to the dihedral angle raised from the back side of the upper plate toward the front side with the inclination of 5 °, the back side of the lower plate with the inclination of 5 to 10 ° from the horizontal plane From the bottom to the front side from the bottom, the backing material is formed on the back side of the weld between the upper and lower plates to be welded.
A dressing material is fixed to the lower part of the front side of the welded part, respectively.- The operating angle of the welding torch that moves with the traveling carriage that moves along the joint on the surface of the welded part, using an angle adjuster,
A dihedral angle descending from the horizontal plane at an inclination of 5 to 15 ° toward the tip side of the welding torch, and a receding angle in which the direction of the welding torch is inclined forward by 30 to 40 ° from the joint normal, to form a welding wire. With an amplitude of 2 to 15 m / m and a speed of 0.1 to 2.0 times /
Weld the first pass of the joint while adjusting the arc position of the welding torch with the torch position adjuster while oscillating in seconds. ・ Then, the working angle of the welding torch is 5 to 10 ° dihedral, And the direction of the welding torch is 5-10 from the joint normal
° Adjusting the arc position of the welding torch while adjusting the arc position of the welding torch while swinging the welding wire at an amplitude of 2 to 15 m / m and a shaking speed of 0.1 to 2.0 times / sec. The second pass welding of the joint is performed while adjusting with a vessel.

The upper plate and the lower plate can be welded by the first pass welding and the second pass welding. However, the third pass and subsequent passes can be performed by the second pass method or another method. It is also possible to add means for performing welding and correcting the welding location.

[0009]

According to the horizontal automatic welding method of the present invention, by adopting the above-described means, the groove angle is reduced, the lead of the molten metal in the welding progress direction is prevented, and the heat input in the thickness direction is dispersed. By doing so, (1) the control of the molten metal by the arc force of the welding torch is facilitated, the molten metal can be welded to any position and shape, the amount of welding is reduced, and a thick plate is welded in the first pass. It became possible to pour the molten metal up to the surface. (2) There is no welding defect such as poor penetration on the back side of the lower plate. (3) The undercut on the back side of the joint and the flow of molten metal on the front side can be prevented.

[0010] This makes it possible to perform welding of a thick plate with a small number of passes, and to reduce the idle time of the horizontal automatic welding apparatus and the welding time. In addition, the use of welding materials can be reduced, and welding without defects can be performed.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a horizontal automatic welding method according to the present invention will be specifically described with reference to FIGS. FIG. 1 is a side view showing an embodiment of a horizontal automatic welding apparatus used in the horizontal automatic welding method of the present invention, and FIGS. 2 and 3 are diagrams for explaining the operating angle of a welding torch in a first pass. 4 and 5 are diagrams for explaining the operation of the welding torch in the second pass, and FIG. 6 is a cross-sectional view of a joint welded by the horizontal automatic welding method of the present invention and a schematic diagram of the surface of the joint.

In FIG. 1, reference numeral 1 denotes an upper plate for welding, and reference numeral 2 denotes a lower plate for welding. As shown in FIG. 6, the lower end of the upper plate 1, that is, the portion to be welded, is located on the upper left side of the figure. A dihedral angle is formed from the back side of the plate 1 toward the front side of the upper plate 1 on the right side of the figure, which is inclined upward by 10 °. Further, the upper end, which is the welded portion of the lower plate 2, is provided with a dihedral angle inclined downward by 10 °. Reference numeral 3 denotes a joint to be welded, 4 denotes a backing material fixed to the back side of the upper plate 1 and the lower plate 2 along the joint 3, and 5 to the upper end of the lower plate 2 along the joint 3. It is a table dressing material. 6 is a magnet for laying the rail 7 on the surface of the upper plate 1 along the joint 3, and 8 is a rail 7
It is a traveling cart that travels on top.

A stay 10 is suspended from the carriage 8 via a vertical adjuster 9 as a position adjuster. At the lower end of the stay 10, a front / rear adjuster 1 as a position adjuster is provided.
1, a support block 12 is attached. A welding torch 14 is attached to the rear of the mounting block 12 via an angle adjuster 13, and a wire diameter fed out from the tip of the welding torch 14 to the front of the mounting block 12 via the welding torch 14. 1.4-2.
An oscillator 17 is provided for swinging the 4 m / m welding wire 15 in a direction indicated by an arrow 16 in FIGS.
An oscillator controller 18 for controlling the operation of the oscillator 17 is provided behind the traveling vehicle 8. further,
In the vicinity of the tip of the welding torch 14, there is provided a protective shield box 19 for flowing a shielding gas during welding to prevent welding defects.

When welding is performed by the horizontal automatic welding apparatus 20, the lower end of the upper plate 1 having a 10 ° dihedral slope, which is a welded portion, and a 10 ° dihedral slope are formed. The lower plate 2 is disposed above and below with the upper end thereof facing the lower plate 2.
Next, after the backing material 4 is fixed on the back side of the joint 3 and the front contact material 5 is fixed on the front side, respectively,
The rail 7 is fixed along the joint 3 with the magnet 6, the traveling carriage 8 is set on the rail 7, and the preparation for welding is completed.

Next, the traveling carriage 8 is controlled by the angle adjuster 13.
As shown in FIG. 2, the welding torch 14 supported by
In addition, a diagonal angle is added, and a receding angle is inclined by 30 to 40 degrees in a direction of moving the welding torch 14 from a normal direction of the upper and lower plates 1 and 2 as shown in FIG. Set the working angle with. The oscillator 17 is actuated by the signal from the oscillator controller 18 on the welding wire 15 fed out to the tip of the welding torch 14, whereby the amplitude is 5 to 12 m / m and the vibration speed is 15 to 25.
2 and 3, the arc position of the welding torch 14 at the operating angle is adjusted by the up-down adjuster 9 and the front-rear adjuster 11 while applying a swing in the direction of arrow 16 shown in FIGS. Perform the first pass welding.

After the welding of the first pass, the welding torch 14
4, a dihedral angle of 5 to 10 ° is formed, and as shown in FIG. 5, a direction opposite to a direction in which the welding torch 14 is moved from a normal direction of the upper and lower plates 1 and 2. 5 on the side
The working angle is set at an advancing angle of 10 to 10 degrees. The welding torch set at the working angle is applied to the welding wire 15 while swinging in the direction of arrow 16 shown in FIGS. 4 and 5 at an amplitude of 2 to 6 m / m and a vibration speed of 50 to 65 times / min. The second pass welding is performed while adjusting the arc position 14 by the vertical adjuster 9 and the front-rear adjuster 11.

Table 1 shows the welding conditions for the first and second passes described above.

[0018]

[Table 1]

Adopting the above-described embodiment, in particular, reducing the groove angle, providing a groove with a dihedral angle at the groove of the lower plate 2, and setting the welding torch 14 at a receding angle to prevent the lead of the molten metal. That is, the heat input in the thickness direction was dispersed by the swing of the welding wire, as shown in FIG.
By welding at the pass, a large amount of the molten metal 21 shown in FIG. Further, by welding the molten metal 21 shown in (B) to a portion where the first pass welding is insufficient by the second pass welding, complete welding without defects can be achieved.

Although the description has been omitted in the above embodiment,
When an insufficient welding portion is left particularly on the surface of the welded portion by the welding of the second pass, the welding of the third and subsequent passes may be performed under the same conditions as the welding conditions of the second pass.

[0021]

As described above, according to the horizontal automatic welding method of the present invention, the thick plate can be welded with a small number of passes by the structure shown in the claims. As a result, it is possible to reduce the idle feeding time of the horizontal automatic welding device, and it becomes unnecessary to remove welding slag and the like required for each welding pass, and (1) the welding time can be greatly reduced.

Further, the control of the molten metal by the welding torch becomes easy. (2) The welding accuracy is improved, and the occurrence of welding defects can be reduced. (3) The amount of welding material used can be significantly reduced. And the like.

[Brief description of the drawings]

FIG. 1 is a side view showing one embodiment of a horizontal automatic welding device used in a horizontal automatic welding method of the present invention;

FIG. 2 is a schematic diagram showing a dihedral angle among the operation angles of a welding torch at the time of the first pass welding in the present invention;

FIG. 3 is a schematic diagram showing a receding angle among the operating angles of the welding torch at the time of the first pass welding in the present invention;

FIG. 4 is a schematic diagram showing a dihedral angle among the operating angles of a welding torch during the second pass welding according to the present invention;

FIG. 5 is a schematic view showing an advance angle of the operation angle of the welding torch at the time of the second pass welding in the present invention;

FIG. 6 is a schematic view showing a welded portion welded by the method of the present invention, wherein FIG. 6 (A) is a sectional view of the welded portion, and FIG. 6 (B) is a diagram showing the surface of the welded portion.

7A and 7B are schematic diagrams showing a welded portion welded by a conventional multi-pass welding method, wherein FIG. 7A is a sectional view of the welded portion, and FIG. 7B is a diagram showing the surface of the welded portion.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Upper plate 2 Lower plate 3 Joining part 4 Backing material 5 Front material 6 Magnet 7 Rail 8 Traveling trolley 9 Vertical adjuster as position adjuster 10 Stay 11 Front-rear adjuster as position adjuster 12 Support block 13 Angle adjustment 14 Welding torch 15 Welding wire 16 Welding wire swing direction 17 Oscillator 18 Oscillator controller 19 Shield box 20 Horizontal automatic welding device 21 Metal melt

──────────────────────────────────────────────────続 き Continuing on the front page (51) Int.Cl. ⁷ Identification symbol FI B23K 33/00 B23K 33/00 Z (72) Inventor Masaru Matsumoto 1-1, Akunouramachi, Nagasaki-shi Inside Nagasaki Shipyard, Mitsubishi Heavy Industries, Ltd. (72) Inventor Minoru Takeda 1-1, Akunouracho, Nagasaki-shi, Mitsubishi Heavy Industries, Ltd. Nagasaki Shipyard (56) References JP-A-62-77179 (JP, A) JP-A-60-210368 (JP, A) JP-A-53-82635 (JP, A) JP-A-50-120446 (JP, A) JP-A-60-130478 (JP, A) JP-A-57-36076 (JP, A) JP-A-6-344139 (JP, A) JP-A-61-38779 (JP, A) JP-B-48-37503 (JP, B1) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 9/02 B23K 9 / 00 B23K 9/095 B23K 9/12 B23K 33/00

Claims (1)

(57) [Claims] 1. A traveling vehicle provided with a welding torch, a torch position adjuster that moves along a welding portion and adjusts an arc position of the welding torch, an angle adjuster that adjusts an operation angle of the welding torch, and a welding portion. With a horizontal automatic welding device consisting of an oscillator that oscillates a welding wire that joins
In the horizontal automatic welding method for welding the joint formed between the upper plate and the lower plate arranged in an upper and lower butted state, a dihedral angle of 10 to 15 ° at the groove of the upper plate, After providing a slope of 5 to 10 degrees in the groove of the lower plate, a backing material on the back side of the joint, and a front material on the front side, respectively, and then, using the angle adjuster, a welding torch. Dihedral angle 5-15
°, the sweep angle is set to 30 to 40 °, the welding wire is set to an amplitude of 2 to 15 m / m by the oscillator, and the vibration speed is set to 0.1 to
While oscillating at 2.0 times / second, the arc position is adjusted by the torch position adjuster to perform the first pass welding of the joint, and then, the welding torch is set at a dihedral angle of 5 to 10 °, The advancing angle is set at 5-10 °, and the welding wire is set at an amplitude of 2-15.
m / m, while oscillating at a shaking speed of 0.1 to 2.0 times / second,
A horizontal automatic welding method, wherein a second pass welding of the welding portion is performed while adjusting an arc position.