JPH0810944A - Automatic horizontal position welding method - Google Patents

Abstract

PURPOSE:To greatly reduce the welding time by setting a welding torch to the prescribed upward torch angle and push angle, and executing the welding while the wire is swayed with the prescribed value. CONSTITUTION:The upward torch angle of 10-15 deg. is set to the groove of an upper plate 1, and the downward torch angle of 5-10 deg. is set to the groove of a lower plate 2 respectively. A backing plate 4 is provided on the reverse side of a part 3 to be joined, and a face plate 5 is provided on the face side respectively. A welding torch 14 is set to the upward torch angle of 5-15 deg. and the push angle of 30-40 deg. by an angle adjuster 13. The arc position is adjusted by a torch position adjuster 13 while the welding wire is swayed with the amplitude of 2-15m/min, and the swaying speed of 0.1-2.0 times/second by an oscillator 17, and the welding of the first pass of the part 3 to be joined is executed. Then, the welding torch 14 is set to the upward torch angle of 5-10 deg. and the drag angle of 5-10 deg., and the arc position is adjusted while the welding wire is swayed with the amplitude of 2-15m/min, and the swaying speed of 0.1-2.0 times/second, and the welding of the second pass of the part 3 to be joined is executed. This constitution improves the welding precision, and reduces the generation of the defective welding.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, welding of steel plates having a plate thickness of 25 mm or more, which are disposed above and below a ship side outer plate, etc., is performed as follows: (1) As shown in FIG. The lower end (groove) shape
Approximately 40 ° from horizontal to upper side from the back side of the steel plate to the front side
Inclined to a certain degree, what is called a dihedral angle is added, and the lower plate 02 has a horizontal groove-shaped upper end (groove) shape, and (2) a backing material on the back side of the welded portion. 03, after fixing the cover material 04 to the front side, respectively, (3) the horizontal automatic welding device is moved in the direction of the arrow in FIG. The multipass welding method is used in which the molten metal 06 is gradually accumulated in the order shown by.

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

The adoption of this multi-pass welding method has a large groove angle described above, 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 the welding torch. Due to the large heat input in the thickness direction and the like, it is difficult to fix a large amount of molten metal 06 to the joint portion with a small number of weldings and a small number of passes, and also, a welding defect is likely to occur. There is.

Therefore, it takes a lot of time to return the horizontal automatic welding device to the welding start point 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 lengthened.

[0006]

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

[0007]

SUMMARY OF THE INVENTION The present invention is directed to the above-described problem in a horizontal automatic welding method for welding an upper plate and a lower plate, which are held in a state of abutting against each other by using a horizontal automatic welding device. In order to solve the above, ・ The groove shape for welding the upper plate is 10 to 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. To the inferior angle, which is lowered from the front to the front side, respectively. ・ A backing material is provided on the back side of the weld between the upper plate and the lower plate for welding.
The surface material is fixed to the lower part on the front side of the weld, and the operating angle of the welding torch that moves with the traveling carriage that moves along the joint on the surface of the weld is adjusted with an angle adjuster.
A dihedral angle that descends from the horizontal surface 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 30 to 40 ° forward from the normal to the welding portion are used. Amplitude 2-15 m / m, speed 0.1-2.0 times /
While oscillating in seconds, adjusting the arc position of the welding torch with the torch position adjuster, the welding of the first pass of the joint is performed, and then the operating angle of the welding torch is a dihedral angle of 5 to 10 °, And the direction of the welding torch is 5 to 10 from the joint normal.
° Adjusting the arc position of the welding torch while swinging the welding wire at an advancing angle tilted rearward with an amplitude of 2 to 15 m / m and a vibration speed of 0.1 to 2.0 times / sec. We adopted a means to perform the second pass welding of the joint while adjusting with a vessel.

Although the upper plate and the lower plate can be welded by the first-pass welding and the second-pass welding, the third 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 above-mentioned welding points.

[0009]

According to the horizontal automatic welding method of the present invention, by adopting the above-mentioned means, the groove angle is made small, the advance of the molten metal in the welding proceeding direction is prevented, and the heat input in the plate thickness direction is dispersed. By doing so, (1) the molten metal can be easily controlled by the arc force of the welding torch, the molten metal can be welded to any position and shape, the amount of welding can be reduced, and the thick plate for welding in the first pass It became possible to deposit molten metal on the surface of. (2) There are no welding defects such as poor penetration on the back side of the lower plate. (3) It is possible to prevent the undercut on the back side of the joint and the flow of molten metal on the front side.

As a result, thick plates can be welded with a small number of passes, the idle time of the horizontal automatic welding device can be reduced, and the welding time can be shortened. Further, it is possible to reduce the use of welding material and to perform defect-free welding.

[0011]

EXAMPLE An embodiment of the horizontal automatic welding method of 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 views for explaining the working angle of the welding torch in the first pass. 4 and 5 are views for explaining the operation of the welding torch in the second pass, and FIG. 6 is a cross-sectional view of a joint portion welded by the horizontal automatic welding method of the present invention and a schematic view of the surface of the joint portion.

In FIG. 1, reference numeral 1 is an upper plate for welding, and 2 is 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 drawing. A dihedral angle is set from the back side of the plate 1 toward the front side of the upper plate 1 on the right side in the figure with an ascending inclination of 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 °. 3 is a joint for welding, 4 is a backing material fixed to the back side of the upper plate 1 and the lower plate 2 along the joint 3, and 5 is fixed to the upper end of the lower plate 2 along the joint 3. This is the surface material. 6 is a magnet for laying the rail 7 on the surface of the upper plate 1 along the joint portion 3, and 8 is the rail 7.
It is a traveling carriage that travels above.

A stay 10 is suspended from the traveling carriage 8 via a vertical adjuster 9 as a position adjuster. A front and rear adjuster 1 as a position adjuster is provided at the lower end of the stay 10.
A support block 12 is attached via 1. Further, a welding torch 14 is attached to the rear of the attachment block 12 via an angle adjuster 13, and a wire diameter is extended from the tip of the welding torch 14 to the front of the attachment block 12 via the welding torch 14. 1.4-2.
An oscillator 17 is provided which swings the 4 m / m welding wire 15 in the direction shown by the arrow 16 in FIGS.
An oscillator controller 18 that controls the operation of the oscillator 17 is provided behind the traveling vehicle 8. further,
A protective shield box 19 is provided near the tip of the welding torch 14 to prevent a welding defect by flowing a shield gas during welding.

When welding is performed by the horizontal automatic welding apparatus 20 described above, the lower end of the upper plate 1 having a dihedral angle of 10 °, which is the welded portion, and the dihedral angle of 10 ° are formed. The upper and lower sides of the lower plate 2 are arranged so as to face each other.
Next, after fixing the backing material 4 to the back side of the joint part 3 and the front covering material 5 to the front side, respectively, above the front side joint part 3 of the upper plate 1,
The rail 7 is fixed by the magnet 6 along the joint portion 3, the traveling carriage 8 is set on the rail 7, and the preparation is completed for welding.

Next, the traveling carriage 8 is moved by the angle adjuster 13.
As shown in FIG. 2, the welding torch 14 supported by is directed toward the tip side of the welding torch 14 from the horizontal plane by 5 to 15 °.
In addition to having a dihedral angle which is inclined to the front and downward, as shown in FIG. 3, a receding angle of inclining by 30 to 40 ° from the normal direction of the upper and lower plates 1 and 2 in the direction of moving the welding torch 14. Set the operating angle with. Then, by operating the oscillator 17 on the welding wire 15 fed to the tip of the welding torch 14 by the signal from the oscillator controller 18, the amplitude is 5 to 12 m / m, and the vibration speed is 15 to 25.
While adjusting the arc position of the welding torch 14 set to the operating angle by the up-down adjuster 9 and the front-rear adjuster 11 while applying swinging in the direction of the arrow 16 shown in FIGS. Weld the first pass.

After completion of the first pass welding, the welding torch 14
As shown in FIG. 4, a dihedral angle of 5 to 10 ° is provided, and as shown in FIG. 5, the direction opposite to the direction in which the welding torch 14 is moved from the normal direction of the upper and lower plates 1 and 2. On the side 5
Set the working angle with an advancing angle that inclines -10 °. Then, a welding torch set to the operating angle is added to the welding wire 15 while swinging in the direction of arrow 16 shown in FIGS. 4 and 5 with 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 of 14 by the up-down adjuster 9 and the front-back adjuster 11.

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

[0018]

[Table 1]

Employment of the embodiment described above, in particular, the groove angle is made small, the groove of the lower plate 2 is provided with an inversion angle inclination, and the welding torch 14 is provided with a receding angle to prevent the advance of molten metal. As shown in FIG. 6, the heat input in the plate thickness direction is dispersed by the swinging of the welding wire.
By welding the passes, a large amount of molten metal 21 shown in (A) can be welded to the joint portion 3. Further, by welding the second pass, the molten metal 21 shown in (B) is welded to a portion where the welding of the first pass is insufficient, so that complete welding without defects can be achieved.

Although not described in the above embodiment,
If insufficient welding spots remain on the surface of the welded portion due to 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 due to the structure described in the claims. As a result, the idle time of the horizontal automatic welding device can be reduced, and it becomes unnecessary to remove the welding slag and the like required for each welding pass, and (1) the welding time can be greatly shortened.

Further, it becomes easy to control the molten metal by the welding torch, (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 so on.

[Brief description of drawings]

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

FIG. 2 is a schematic diagram showing the dihedral angle of the operating angles of the welding torch during 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 during the first pass welding in the present invention,

FIG. 4 is a schematic diagram showing the dihedral angle of the operating angles of the welding torch during the second pass welding in the present invention,

FIG. 5 is a schematic view showing an advancing angle of the operating angles of the welding torch during the second pass welding in the present invention,

FIG. 6 is a schematic diagram showing a welded portion welded by the method of the present invention, 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.

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

[Explanation of symbols]

 1 Upper Plate 2 Lower Plate 3 Joint 4 Back Material 5 Surface Material 6 Magnet 7 Rail 8 Traveling Cart 9 Vertical Adjuster as Position Adjuster 10 Stay 11 Front / Back Adjuster as Position Adjuster 12 Support Block 13 Angle Adjustment 14 Welding torch 15 Welding wire 16 Welding wire swinging direction 17 Oscillator 18 Oscillator controller 19 Shield box 20 Horizontal automatic welding device 21 Metallurgical

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location B23K 33/00 Z (72) Inventor Masaru Matsumoto 1-1 No. 1 Atsunouramachi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Inside the shipyard (72) Inventor Minoru Takeda 1-1 1-1 Atsunoura-machi, Nagasaki City Mitsubishi Heavy Industries Ltd. Nagasaki Shipyard

Claims (1)

[Claims] 1. A welding torch, a traveling carriage provided with a torch position adjuster that moves along a welded portion and adjusts an arc position of the welding torch, an angle adjuster that adjusts an operating angle of the welding torch, and a welded portion. With a horizontal automatic welding device consisting of an oscillator that swings the welding wire for joining
In a horizontal automatic welding method for welding a joint formed between an upper plate and a lower plate arranged in a butt state above and below, a dihedral angle of 10 to 15 ° at a groove of the upper plate, Each of the groove of the lower plate is provided with an incline of an inversion angle of 5 to 10 °, a backing material is installed on the back side of the joint, and a fronting material is installed on the front side. Then, a welding torch is installed by the angle adjuster. Dihedral 5-15
The sweep angle is set to 30 to 40 °, and the amplitude of the welding wire is set to 2 to 15 m / m and the vibration speed is set to 0.1 by the oscillator.
While swinging at 2.0 times / sec, the arc position is adjusted by the torch position adjuster to perform the first pass welding of the joint portion, and then the welding torch is dihedral 5 to 10 °. The advancing angle is set to 5 to 10 °, and the welding wire has an amplitude of 2 to 15
While rocking at m / m and shaking speed 0.1 to 2.0 times / sec,
A horizontal automatic welding method, characterized in that the second pass of the weld is welded while adjusting the arc position.