JPH105998A - Melt-cutting machine with welding groove - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a melt-cutting machine with a welding groove, by which the formation of the groove part or the assembly of members, etc., are easily executed and the joint strength can be heightened by good penetrating depth. SOLUTION: A cutting torch 20 is fixed to a driving part 21a of a shaking device 21 through a supporting shaft 22 at the side part. Further, the shaking device is fixed to an arm 24 of a truck for moving through a connecting shaft 23 formed on the upper surface thereof. In the case of melt-cutting a plate-like member 12, the cutting torch is arranged above the plate-like member and horizontally advanced toward the cutting direction. At this time, since the cutting torch is reciprocatively moved to the direction crossed at the right angle to the advancing direction while advancing in the cutting direction by driving the shaking device, the plate-like member is alternately formed as groove-like recessed parts 12a and linear projecting parts 12b so as to penetrate from the surface to the back surface to melt-cut the plate-like member as the waving state in the flat plane view. Further, the shaking amplitude is made to 0.5-10(mm).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fusing machine for forming a welding groove applied to welding of a butt joint, a square joint, a T joint and the like of a steel structure, and more particularly, to a welding groove portion efficiently. The present invention relates to a welding groove fusing machine capable of forming a joint and improving joint strength after welding.

[0002]

2. Description of the Related Art FIG. 6 is a front view showing a groove portion of a conventional T-joint. As shown in FIG. 6, the vertical steel plate 1 and the horizontal steel plate 2 are assembled in a T-shape in a front view so as to vertically intersect, and the front end surface 2 b of the steel plate 2 abuts on the surface of the steel plate 1. ing.

In a T-joint assembled as shown in FIG. 6, partial penetration welding is performed by so-called fillet welding. As described above, in the case where the required joint strength is relatively low in the T joint, the tip surface 2b of one member (steel plate 2) is cut flat along the surface of the other member (steel plate 1). A groove can be machined only by using this.

However, in the T-joint having such a groove, the member (steel plate 2) can be easily processed, but it is difficult to secure a desired penetration depth during welding. However, high joint strength cannot be obtained. Therefore, in general, in the case of welding a butt joint, a square joint, a T joint, or the like in a steel structure or the like, in order to secure a good penetration depth and obtain a desired joint strength, at least one of the joints is required. After forming an inclined notch in the member, the joint is assembled and welded.

FIG. 7 is a front view showing the shape of another groove portion of a conventional T-joint. In the T joint shown in FIG. 7, at one end surface of the steel plate 4,
An inclined notch 4a is formed. Then, like the joint shown in FIG. 6, the vertical steel plate 3 and the horizontal steel plate 4 are assembled in a T-shape in a front view so as to vertically intersect, and the open front end has a R-shaped groove. 5 are formed, and the front end surface 4b of the steel plate 4 is slightly separated from the surface of the steel plate 3.

[0006] When the inclined notch 4a is formed in the joint as described above, a deep penetration is obtained at the time of welding, so that a high joint strength can be obtained.

[0007]

However, when the groove 5 as shown in FIG. 7 is machined, the end face 4b of one member (steel plate 4) is flattened along the other member (steel plate 3). There is a problem that two steps of a step of cutting the hole and a step of forming the notch 4a are required. Therefore, in order to form the re-groove groove 5, as shown in FIG. 6, the tip surface 2b of the member (steel plate 2) is simply cut flat along the other member (steel plate 1). In comparison with the case of the above, the processing cost is twice or more required.

Further, when welding a member having an inclined groove portion (inclined groove portion), it is relatively difficult to set welding conditions for obtaining a sufficient adequate amount of excess in a single layer. .
That is, when welding is performed under the condition that the molten metal does not burn through at the root portion (the contact portion between the end surface 4b of the steel plate 4 and the steel plate 3), the excess build may be insufficient, and the sufficient build up may be obtained. When the welding conditions are set, the molten metal tends to burn through.

In addition, as shown in FIG. 6, when an inclined groove (inclined groove) is not formed, generally, a root gap is provided between members in order to deepen the penetration. Has been applied. Therefore, in order to maintain a uniform appropriate width of the root gap, it is necessary to perform tack welding while measuring and adjusting the gap or to arrange a spacer between the members in the assembly process of the two members of the joint.

However, when such a method is used, it is difficult to form a uniform gap in a joint whose welding line is not straight. In addition, when a partial penetration state occurs, there is no contact portion between the unwelded tip end surface 2b of the steel plate 2 and the steel plate 1 or the contact portion is reduced, so that shrinkage deformation occurs due to welding, and dimensions are reduced. Accuracy decreases. Furthermore, the assembly process of the joint becomes complicated,
When a spacer or the like is used, members other than such a joint member are required, which increases the cost. Also, depending on the joint shape, it is extremely difficult to maintain an appropriate root gap.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to easily process a welding groove portion with high accuracy, and to assemble a joint using the processed welding base material and perform welding. In this case, it is possible to obtain a good penetration depth without the need for complicated assembling work and without increasing the cost required for forming a groove or assembling members, thereby increasing the joint strength. An object of the present invention is to provide a welding groove fusing machine that can be increased.

[0012]

A welding groove fusing machine according to the present invention is a welding groove fusing machine for forming a welding groove by fusing a member, comprising: a cutting torch for fusing the member; A moving means for moving the torch in a first direction; and a rocking means for rocking the cutting torch in a second direction perpendicular to the first direction, wherein a rocking amplitude W of the rocking means is provided. Is 0.5 to 10 mm. The second direction in which the cutting torch swings need not be exactly the direction perpendicular to the first direction in which the cutting torch is moved by the moving means, but may be any direction that is substantially perpendicular.

The swinging means may stop the cutting torch at the peak of the amplitude, and the moving distance L of the cutting torch in the first direction during the swing stop period is 200.
mm or less. In addition, the moving means sets the moving speed of the cutting torch in the first direction to V ₁ (m
m / sec) and the frequency is Hz ₁ (times / sec), the moving distance (V ₁ / Hz ₁ ) in the first direction per vibration is 1.
It is preferably 5 to 10 (mm / time).

Further, the heat source of the cutting torch is a laser, and the moving speed of the cutting torch in the first direction is V ₁ (m
m / sec), (when the times / second), the formula ^{_{(V ac1 = (V 1 2}} + 4 × W 2 × Hz 1 2) the frequency Hz ₁ blown linear velocity V calculated by ^1/2 × 6 _ac1 is 20 to 250 (cm /
Min). This is because, even when the heat source of the cutting torch is plasma, the fusing linear velocity V _ac1 is preferably 20 to 250 (cm / min). V
_ac1 is preferably 20 to 120 (cm / min).

In the case where the rocking means stops the rocking of the cutting torch at the peak of the amplitude, the moving distance in the first direction per one vibration and the fusing linear velocity exclude the rocking stop period. It can be calculated from the moving speed and frequency of the cutting torch in the first direction, and these preferred ranges are
This is the same as the case where the swing means does not stop the swing.

Furthermore, it is preferable that the joint is assembled with the welded surface of the member blown off by the cutting torch as an open tip and welded along the welded surface.

In the present invention, the fusing machine has a moving means for moving the cutting torch in a first direction, and a rocking means for rocking the cutting torch in a second direction orthogonal to the first direction. Therefore, the cutting torch melts the member while advancing in a wavy manner. Therefore, a wave-shaped unevenness from the upper surface to the rear surface can be easily formed on the fusion surface of this member, that is, the open front end, and a groove having a desired shape can be obtained.

Further, when a member is blown off using the welding groove fusing machine according to the present invention, and a joint is assembled using this welded cross section as an open tip, and welding is performed along the welded cross section, a corrugated concave and convex portion is formed. Since a local root gap is formed and it is not necessary to maintain the root gap by temporary welding or a spacer, assembly of members for welding is facilitated. In addition, the convex portion of the concavo-convex formed on the fusion surface has a small heat capacity and is relatively easily melted by welding heat, so that the penetration depth can be increased by the action of the root gap of the concave portion. Further, the convex portion has an effect of preventing the molten metal from burning through. Therefore, the joint strength can be improved by these effects.

Furthermore, when performing partial penetration welding at the time of this welding, since the unwelded portion of the projection is in contact with the other member of the joint, welding shrinkage can be reduced,
Thereby, dimensional accuracy after welding can be improved.

When the member is blown out using the welding groove fusing machine according to the present invention, a concave portion having such a function as a root gap and a convex portion having a function of preventing burn-out are easily formed at the same time. can do. In addition, the fusing machine can form the uneven surface at the same time as the fusing of the member, so that the groove is formed in two steps of the fusing of the member and the step of forming the inclined groove. The groove can be machined at low cost.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a welding groove fusing machine according to an embodiment of the present invention. The cutting torch 20 has its side 2
Oa is a swinging device 21 (swinging means) via a support shaft 22.
Is fixed to a drive section 21a formed on the side of the drive section 21a. The swinging device 21 swings continuously and regularly without stopping, for example, and can set the swing amplitude to a desired value. A connection shaft 23 extending upward from the drive device 21 is formed on the upper surface of the drive device 21, and the connection shaft 23 is fixed to an arm 24 of a moving carriage (not shown).

When the plate-like member 12 serving as a welding base material is blown by using the fusing machine 30 configured as described above, the cutting torch 20 is arranged above the plate-like member 12, and the cutting direction (first direction) is set. ). At this time, when the swing device 21 is operated, the driving unit 21a of the swing device 21 is operated.
Swings, and the cutting torch 20 swings horizontally in a direction approaching or moving away from the swinging device 21. That is, since the cutting torch 20 reciprocates in the direction (second direction) orthogonal to the traveling direction while traveling in the cutting direction, it moves along the waveform line in plan view. Therefore, the plate-like member 1
2, the groove-like concave portion 12a and the streak-like convex portion 12a extend from the front surface to the rear surface of the plate-like member 12.
b are alternately formed, and are blown in a wave shape in plan view.

Next, a description will be given of a joint welding method using the plate-like member 12 having the wavy welded surface 12c.

FIG. 2A is a perspective view showing a joint for explaining a method of welding the plate member 12, FIG. 2B is a plan view thereof, and FIG. 2C is a front view thereof.

As shown in FIG. 2, at the time of welding, a plate-like member 12 having a corrugated welded surface 12c and a plate-like member 11 having a commonly used shape are prepared, and are arranged vertically. After assembling the T-joint 10 such that the plate-shaped member 11 and the plate-shaped member 12 vertically intersect with each other by applying the fusion surface 12c of the plate-shaped member 12 arranged horizontally to the surface of the member 11, Welding is performed along the fusion surface 12c of the member 12.

Then, since the convex portion 12b of the plate member 12 has a small heat capacity, it is relatively easily melted by welding heat. Further, the convex portion 12b is in contact with or close to the surface of the plate-like member 11, and the concave portion 12a is
Since it plays a role as a root gap with 2, deep penetration can be obtained. On the other hand, the convex portion 12b has an effect of preventing the molten metal from burning through. That is, at the time of welding, a desired penetration depth and a desired margin can be obtained due to a mutual effect between the concave portion 12a and the convex portion 12b. Therefore, a high joint strength can be obtained, and it is easy to assemble the members into a desired joint shape, and a spacer or the like is not required, so that an increase in cost for that can be prevented.

Further, a root portion (a convex portion 12 of the plate-like member 12)
b and the plate-like member 11), the unwelded portion is made extremely small, and even when trying to obtain a welded portion close to complete penetration welding, the presence of the convex portion 12b as described above In addition, it is possible to prevent the molten metal from burning through. On the other hand, when performing partial penetration welding, since the unwelded portion of the convex portion 12b is in contact with the plate-shaped member 11, shrinkage deformation due to welding is reduced, and dimensional accuracy after welding is improved.

As described above, when the fusing machine 30 according to the present embodiment is used, the concave portion 12a having a function as a root gap and the convex portion 12b having a function of preventing burnout are formed.
Can be easily formed at the same time, and a welded joint having excellent performance can be obtained at low welding cost due to the corrugated welded surface formed by the cutting machine 30. In addition, by using the fusing machine 30, the step of fusing the plate-shaped member 12 to a desired size and the step of forming a corrugated fused surface having irregularities can be performed simultaneously.
A desired groove can be obtained in only one step, and the processing cost of the groove can be reduced.

In a conventional gas fusing machine and plasma fusing machine, it is possible to blow a plate-like member along a curved line and a rectangular line by using an NC or a copying mechanism without using a swinging device. In such a method, it is difficult to reduce the amplitude of the swing and perform the fusing at a relatively high speed. In addition, when swinging is performed by the copying mechanism, the durability of the fusing machine may be reduced. Furthermore, as a method of forming a cut surface having irregularities on a member, there is another method such as machining. However, in the method of machining the irregularities by machining, the machining cost may not be reduced. Therefore, as shown in the present invention, when a welding torch is used to blow off a member using a fusing machine fixed to a rocking device, a welded surface having a concave portion having a regular and desired depth can be easily formed with high precision. Can be formed.

In this embodiment, one cutting torch 2
Although the example in which one rocking device 21 is connected to 0 is shown, a single rocking device can be connected so as to rock a plurality of cutting torches, and a rocking device connected to the cutting torch can be connected. A fusing machine having a plurality of moving devices may be used.
Further, since the rocking device 21 used in the present embodiment rocks regularly without stopping, the fused surface 12c of the plate-shaped member 12 has a wavy uneven surface, but every fixed time. A rocking device that stops rocking may be used.

FIG. 3 is a perspective view showing the shape of a fusion section when a plate-like member is fused using a fusion machine according to another embodiment of the present invention.

In this embodiment, 1 is used as the swinging device.
The plate-like member 16 is blown off by a fusing machine (not shown) using a device that stops for a certain period of time after swinging back and forth. Therefore, the fusion surface 16c of the plate-like member 16 is composed of a wide groove-like concave portion 16a and a stripe-like convex portion 16b extending from the front surface to the back surface of the plate-like member 16, and the concave portion 16a
Has a flat bottom surface. That is, when the cutting torch is
When swinging to the bottom side of 6a, the swing device has been stopped for a certain period of time.

Even when the plate member 16 blown by such a fusing machine is used, by setting the depth of the concave portion 16a or the distance between the adjacent convex portions 16b appropriately, a welded joint having excellent performance can be obtained. Can be obtained.

In the present invention, a gas as a heat insulating source,
A cutting torch using a plasma or a laser can be used.
It can be applied to welding of joints, butt joints, square joints and the like.

As the oscillating means, an apparatus having an oscillating function such as a mechanical type using a cam mechanism or the like or a type that stops oscillating by an electric signal or a combination type thereof can be used. Motion devices can also be used.

Hereinafter, the oscillating means of the welding groove fusing machine according to the present invention will be further described.

Oscillation amplitude W: 0.5 to 10 mm The oscillation amplitude W of the cutting torch oscillated by the oscillating means is 0.
If it is less than 5 mm, the unevenness of the melted section of the member blown off by the blower becomes too small, and the effect of increasing the penetration depth during welding decreases. On the other hand, when the swing amplitude W is 1
If it exceeds 0 mm, the depth of the concave portion acting as a root gap becomes too deep during the assembly of the joint, so that the molten metal will burn through during welding. Therefore, the swing amplitude W is set to 0.5 to 10 mm.

The cutting in the first direction during the swing stop period
When the member is blown off while rocking the cutting torch without stopping the rocking movement L: 200 mm or less , the melted cross section is formed with concave portions and convex portions alternately at regular intervals. It has irregularities. However, the unevenness formed on the melt surface of the member is
It is not necessary that the concave portions are formed regularly at regular intervals. By appropriately setting the depth of the concave portion, for example, irregularities formed of a local convex portion and a wide concave portion may be formed. . Such irregularities can be formed by the rocking means stopping the rocking of the cutting torch at one vertex of the amplitude. Since the appropriate stop time of the swing is related to the fusing speed, in the present invention, it is defined by the moving distance L of the cutting torch in the first direction during the swing stop period. To stop rocking at the peak of one amplitude,
When the moving distance L of the cutting torch in the first direction during the swing stop period exceeds 200 mm, it becomes difficult to maintain a uniform width of a portion acting as a root gap when the joint is assembled. In addition, when welding a welding line having a curve, the accuracy of assembling the joint is likely to be reduced. Therefore, when the swinging means stops the cutting torch at the peak of one amplitude, the moving distance L of the cutting torch in the first direction during the swing stop period is preferably 200 mm or less.

Transfer in the first direction per vibration of the cutting torch
Moving distance: 1.5 to 10 (mm / time) The first of the cutting torch while the cutting torch vibrates once.
The moving distance in the direction can be calculated by an equation (V / Hz), where the moving speed of the cutting torch in the first direction is V (mm / sec) and the frequency is Hz (times / sec). . This value determines the interval between the protrusions of the welding groove and the width of the protrusions. When (V / Hz) exceeds 10 (mm / times), the width of the convex portion becomes too large, and the penetration depth in the welding line fluctuates significantly, making it impossible to obtain uniform penetration. . On the other hand, (V / Hz) is 1.5 (mm /
Times), the pitch of the unevenness becomes too fine,
The effect of increasing penetration due to the recess cannot be obtained. Further, when cutting is performed by increasing the vibration amplitude in order to increase the volume of the concave portion, the fusing linear velocity tends to be excessively high, so that a favorable cut surface cannot be obtained. Therefore, the moving distance in the first direction per one vibration of the cutting torch is preferably 1.5 to 10 (mm / times). When the cutting torch is stopped at the peak of the amplitude, the moving speed V and the frequency Hz at this time are the moving speed and the frequency of the cutting torch per second excluding this stop period.

Fusing linear velocity V _ac : 20 to 250 (cm /
The fusing line speed V _ac is the moving speed of the cutting torch along the fusing line, and is determined by the moving speed V of the cutting torch in the first direction, the swing amplitude W, and the frequency Hz. V _ac = (V ² + 4 × W ² × Hz ² ) ^1/2 × 6). When the swing amplitude W and the frequency Hz increase, the fusing linear velocity V _ac also increases. When the heat source of the cutting torch is a laser, and when V _ac exceeds 250 (cm / min), a cut surface that can withstand practical use Can not be obtained. On the other hand, if the fusing linear velocity _Vac is less than 20 (cm / min), the heat input to the cut surface becomes excessive, so that an excellent uneven surface cannot be obtained, and the fusing efficiency is reduced to reduce welding cost. Can not be done. Therefore, the fusing linear velocity _Vac is preferably set to 20 to 250 (cm / min). The moving speed V and the frequency Hz at this time are the moving speed and the frequency of the cutting torch per second excluding the stop period when the cutting torch stops at the peak of the amplitude.

Note that even when the heat source of the cutting torch is plasma, the fusing linear velocity _Vac is 20 to 250 (c
m / min), and when the heat source of the cutting torch is a gas, the fusing linear velocity V _ac is 20 to 120.
(Cm / min).

[0043]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment using a fusing machine according to the present invention will be specifically described below in comparison with a comparative example.

First, a welding section according to the present invention is used to form a welding section having corrugated irregularities on a plate member, and this welding section is brought into contact with another member to assemble a T-joint. This was welded and a penetration depth comparison test was performed.

FIG. 4 is a front view showing the shape and size of the T joint used in the penetration depth comparison test. FIG.
(A) is a plan view showing the shape and size of a plate-shaped member that has been cut using the cutting machine according to the embodiment of the present invention,
(B) is a front view thereof.

As a comparative example, as shown in FIG. 2, a plate member 13 having a plate thickness of 14 mm and a plate member having a plate thickness of 12 mm are provided.
A plate-like member 14 whose end face is cut flat by a conventional fusing machine is prepared. T which is assembled by contacting the flat end surface 14a of the plate member 14
A joint was used. At this time, the plate-shaped member 14 is brought into contact with the plate-shaped member 13 such that the upper surface thereof is disposed at a position 12 mm from the end surface 13a of the plate-shaped member 13, and between the plate-shaped members 13 and 14. No root gap was provided.

In the embodiment, as shown in FIG. 5, instead of the plate-like member 14, a plate-like member 15 having a corrugated welded surface 15c formed by a welding groove fusing machine of the present invention was used. That is, the plate-like member 15 has
A plurality of groove-like concave portions 15a and streak-like convex portions 15b extending from the surface of the plate member 15 to the back surface are blown so as to be alternately formed at equal intervals. The joint was assembled by bringing the convex portion 15b of the shaped member 15 into contact. In this embodiment, the thickness of the plate-like member 15 is 12 m
m, the interval between adjacent convex portions 15b is 5 mm,
The depth of 5a was 2.5 mm.

The two types of T-joints are welded under the same welding conditions, and after welding, a cross-sectional macro is sampled from the welded portion and the root thickness of the unwelded portion is measured to obtain a penetration depth. Was evaluated. However, welding was performed using a wire having a diameter of 1.4 mm and automatic CO ₂ welding.
The cutting conditions when gas cutting the plate-like member 15 using the fusing machine of the present invention are shown in Table 1 below, and the welding conditions and evaluation results are shown in Tables 2 and 3 below, respectively.

[0049]

[Table 1]

[0050]

[Table 2]

[0051]

[Table 3]

As shown in Tables 1 to 3, when a member was blown by the welding groove fusing machine of the present embodiment and a T joint formed using this member was welded, a comparison was made under any welding conditions. Compared with the example, the route length of the unwelded portion was reduced. That is, the penetration depth was increased, and a high-strength welded joint was obtained.

Next, using the fusing machine according to the present invention, a mild steel sheet having a thickness of 12 mm was gas-cut under various cutting conditions, the possibility of cutting was investigated, and the condition of the cut surface was evaluated. . The evaluation of the cut surface was evaluated as ○ when a substantially equivalent uneven shape was obtained by comparing the front side and the back side of the plate material, and △ when the uneven shape was significantly different between the front side and the back side of the plate material.
The sample that could not be cut was marked as x.

Further, for those having good cut surfaces, automatic MAG welding was performed in accordance with the welding condition code D shown in Table 2 above, and the weldability was evaluated based on the penetration depth and the presence or absence of burn-through. did. However, the shielding gas is Ar +
20% CO ₂ was used. The evaluation of the weldability is 10% of the plate thickness compared to the penetration depth in a normal natural groove.
If the penetration depth was increased, then ○, if the penetration depth was not sufficiently increased, and △ if the penetration depth was less than 10%, × The one in which occurred was designated as XX. The cutting conditions and evaluation results are shown in Tables 4 to 9 below.

[0055]

[Table 4]

[0056]

[Table 5]

[0057]

[Table 6]

[0058]

[Table 7]

[0059]

[Table 8]

[0060]

[Table 9]

As shown in Tables 4 to 9 above, Example N
o. 11 to 26, the swing amplitude W, the moving distance L in the first direction while the swing is stopped, the fusing linear velocity _Vac, and the moving distance V / Hz in the first direction per vibration are within the scope of the present invention. As a result, the cut surface was good and the weldability was also excellent.

On the other hand, in Comparative Example No. In Nos. 28 and 29, since the swing amplitude W was less than the lower limit of the range of the present invention, a sufficient penetration depth could not be obtained, and the weldability was reduced. Comparative Example N
o. The cut surfaces of Samples Nos. 30 and 31 were good because V / Hz was less than the lower limit of the range of the present invention, but the weldability was reduced. Comparative Example No. Samples Nos. 32 and 33 had V / Hz lower than the lower limit of the present invention and _Vac exceeded the upper limit of the present invention.

Comparative Example No. In Nos. 34, 37, 41 and 49, the weldability was poor because the moving distance V / Hz in the first direction per vibration exceeded the upper limit of the range of the present invention.
Comparative Example No. 35, 36, 38, 39, 40, 42, 4
3, 45, 47, 48, 50, 51 and 52 could not be cut because the fusing linear velocity _Vac exceeded the upper limit of the range of the present invention.

In Comparative Example No. 44 is the fusing linear velocity V _ac
However, since the swing amplitude W exceeded the upper limit of the range of the present invention and the swing amplitude W exceeded the upper limit of the range of the present invention, the cut surface became defective, and a sufficient penetration depth could not be obtained. Comparative Example No. In No. 46, the weldability was reduced because the swing stop distance L exceeded the upper limit of the range of the present invention.

Next, using the cutting machine according to the present invention,
Laser cutting of a mild steel plate having a plate thickness of 12 mm was performed under various cutting conditions, the possibility of cutting was investigated, and the condition of the cut surface was evaluated. Then, those having a good cut surface were subjected to automatic MAG welding according to the conditions of welding condition symbol D shown in Table 2 above, and the weldability was evaluated based on the penetration depth and the presence or absence of burn-through. In this embodiment, a 3 kW CO ₂ laser processing machine was used as the laser processing machine.
The evaluation of the cut surface and weldability is the same as in the case of gas cutting. These cutting conditions and evaluation results are shown in Table 1 below.
0 to 15 are shown.

[0066]

[Table 10]

[0067]

[Table 11]

[0068]

[Table 12]

[0069]

[Table 13]

[0070]

[Table 14]

[0071]

[Table 15]

As shown in Tables 10 to 15 above, Example Nos. Numerals 53 to 71 denote the swing amplitude W, the moving distance L in the first direction while the swing is stopped, the fusing linear velocity _Vac, and the moving distance V / Hz in the first direction per vibration within the range of the present invention. As a result, the cut surface was good and the weldability was also excellent.

On the other hand, in Comparative Example No. In Nos. 72 and 73, since the swing amplitude W was less than the lower limit of the range of the present invention, a sufficient penetration depth could not be obtained, and the weldability was reduced. Comparative Example No. In No. 74, since V / Hz was less than the lower limit of the range of the present invention, weldability was reduced. Comparative Example No. 75 is V / H
z is less than the lower limit of the range of the present invention, and the fusing linear velocity V
Since ac exceeded the upper limit of the range of the present invention, the cut surface was defective.

In Comparative Example No. 76, 78, 79, 8
2, 85, 87, 88, 90, 91 and 93 are V / Hz
Exceeds the upper limit of the range of the present invention.
In 85 and 87, since the swing amplitude W also exceeds the upper limit of the range of the present invention, a uniform penetration depth cannot be obtained, and the weldability decreases or becomes poor, and burn-through occurs. There was also.

In Comparative Example No. 77, 80, 81, 8
In 3, 84, 86, 89, 92, and 94 to 97, the cut surface was defective or could not be cut because the fusing linear velocity _Vac exceeded the upper limit of the range of the present invention.

Further, in the same manner, a cut surface is formed by plasma cutting, the condition of the cut surface is evaluated, and a joint is assembled and welded using the cut surface as an open tip. As a result, the cut surface is formed by laser cutting. Similar results were obtained, and a good cut surface was obtained when the fusing linear velocity _Vac was in the range of 20 to 250 (cm / min), and the weldability was also good.

[0077]

As described in detail above, according to the present invention,
Moving means for moving the cutting torch in one direction by the fusing machine;
Swinging means for swinging the cutting torch in a direction orthogonal to one direction, so that the cutting torch melts the member while advancing in a wave shape, so that a surface having irregularities can be easily processed. And a groove having a desired shape can be obtained. Also, by assembling a joint with the weld cross section of this member as an open tip and welding this joint, it is possible to obtain a welded joint having high joint strength with deep penetration,
The burn-through of the molten metal can be prevented, whereby the processing and assembly for welding can be easily performed at low cost.

Further, since the swinging amplitude of the cutting torch that swings by the swinging means is appropriately set, a further deeper penetration can be obtained, and the melting of the molten metal can be prevented. When the swinging of the cutting torch is stopped at the top of the joint, if the moving distance L in the first direction while the swinging is stopped is appropriately set, the assembly and working of the joint are further facilitated. Further, by appropriately setting the fusing linear velocity V _ac and the moving distance V / Hz in the first direction per vibration, fusing can be performed with high accuracy.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a welding groove fusing machine according to an embodiment of the present invention.

FIG. 2A is a perspective view showing a joint for explaining a method of welding a plate-shaped member blown using a fusing machine according to an embodiment of the present invention, and FIG. (C) is the front view.

FIG. 3 is a perspective view showing the shape of a fusion section when a plate-shaped member is fused using a fusion machine according to another embodiment of the present invention.

FIG. 4 is a front view showing the shape and size of a T-joint used in a penetration depth comparison test.

FIG. 5A is a plan view showing the shape and size of a plate-like member that has been blown using the fusing machine according to the embodiment of the present invention, and FIG. 5B is a front view thereof.

FIG. 6 is a front view showing a groove portion of a conventional T-joint.

FIG. 7 is a front view showing the shape of another groove portion of a conventional T-joint.

[Explanation of symbols]

 1, 2, 3, 4; steel plate 4a; notch 5; groove 10; joints 11, 12, 13, 14, 15, 16; Parts 12c, 15c, 16c; fusion section 20; cutting torch 21; rocking device 21a; drive unit 22; support shaft 23;

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Office reference number FI Technical display location B23K 31/00 B23K 31/00 P 33/00 33/00 Z

Claims (13)

[Claims] 1. A welding groove fusing machine for forming a welding groove by fusing a member, a cutting torch for fusing the member, moving means for moving the cutting torch in a first direction, and the cutting torch. Swinging means for swinging in a second direction orthogonal to the first direction, wherein the swinging amplitude of the swinging means is 0.5 to 10 (mm). To make a welding groove fusing machine. 2. The welding groove cutting machine according to claim 1, wherein said swinging means stops swinging of said cutting torch at a peak of amplitude. 3. The welding groove fusing machine according to claim 1, wherein the swinging means does not stop the swinging of the cutting torch at the peak of the amplitude. 4. The welding groove fusing machine according to claim 2, wherein the moving distance L of the cutting torch in the first direction during the swing stop period is 200 mm or less. 5. The moving means sets a moving speed of the cutting torch in the first direction to V ₁ (mm / sec) and a frequency to H.
When z ₁ (times / second) is set, the moving distance (V ₁ / Hz ₁ ) in the first direction per vibration is 1.5 to 10 (mm / Hz).
4. The welding groove fusing machine according to claim 3, wherein: 6. The moving means sets the moving speed of the cutting torch in the first direction to V ₂ (mm) excluding a swing stop period.
/ S) and the frequency is Hz ₂ (times / second), the moving distance (V ₂ / Hz ₂ ) in the first direction per vibration is 1.5.
3 to 10 (mm / time).
Or the welding groove fusing machine according to 4. 7. A heat source of the cutting torch is a laser, and the moving speed of the cutting torch in the first direction is V ₁ (m
m / sec), (when the times / second), the formula ^{_{(V ac1 = (V 1 2}} + 4 × W 2 × Hz 1 2) the frequency Hz ₁ blown linear velocity V calculated by ^1/2 × 6 _ac1 is 20 to 250 (cm /
The welding groove fusing machine according to claim 3 or 5, wherein: 8. The heat source of the cutting torch is plasma, and the moving speed of the cutting torch in the first direction is V ₁ (m
m / sec), (when the times / second), the formula ^{_{(V ac1 = (V 1 2}} + 4 × W 2 × Hz 1 2) the frequency Hz ₁ blown linear velocity calculated by ^1/2 × 6) V _ac1 is 20 to 250 (cm /
The welding groove fusing machine according to claim 3 or 5, wherein: 9. The heat source of the cutting torch is a gas,
The moving speed of the cutting torch in the first direction is V ₁ (mm /
Second) and the frequency is Hz ₁ (times / second), the equation (V
^{_{ac1 = (V 1 2 + 4}} × W 2 × Hz 1 2) 1/2 × 6 claim 3 or 5 blown linear velocity V _ac1 to be calculated characterized in that it is a 20 to 120 (cm / min) by 4. A welding groove fusing machine according to claim 1. 10. The heat source of the cutting torch is a laser, and the moving speed of the cutting torch in the first direction excluding the swing stop period is V ₂ (mm / sec), and the frequency is Hz ₂ (times / time). Seconds)
When a, formula ^{_{(V ac2 = (V 2 2}} + 4 × W 2 × Hz 2 2)
Fusing linear velocity V _ac2 calculated by ^1/2 × 6 is 20 to 2
5. The pressure is 50 (cm / min).
7. The welding groove fusing machine according to any one of claims 6 and 7. 11. The heat source of the cutting torch is plasma, and the moving speed of the cutting torch in the first direction excluding the swing stop period is V ₂ (mm / sec), and the frequency is Hz ₂ (times / time).
(Seconds), the equation (V _ac2 = (V ₂ ² + 4 × W ² × Hz)
₂ ²⁾ welding the open according to any one of claims 2, 4 and 6 the fusing line velocity V _ac2 to be calculated characterized in that it is a 20 to 250 (cm / min) by ^1/2 × 6 Point fusing machine. 12. The heat source of the cutting torch is gas, and the moving speed of the cutting torch in the first direction except for the swing stop period is V ₂ (mm / sec), and the frequency is Hz ₂ (times / time). Seconds)
When a, formula ^{_{(V ac2 = (V 2 2}} + 4 × W 2 × Hz 2 2)
Fusing linear velocity V _ac2 calculated by ^1/2 × 6 is 20 to 1
5. The pressure is 20 (cm / min).
7. The welding groove fusing machine according to any one of claims 6 and 7. 13. A joint assembling with a weld cross section of the member blown off by the cutting torch as an open tip, and welding along the weld cross section. Item 2. A welding groove fusing machine according to item 1.