KR101034660B1 - Weaving control method used when it processes weld for connecting pipes - Google Patents

Abstract

PURPOSE: A method for controlling weaving applied in welding for steel pipe connection is provided to enable uniform welding by preventing welding bead from flow down and minimizing overlap phenomenon. CONSTITUTION: A method for controlling weaving applied in welding for steel pipe connection comprises following steps. The lowest point of a steel pipe connection part is set up a first point(P1). A point at a right angle from the lowest point to upward columnar direction is set up as a second point(P2). A point at a right angle to the highest point is set up as a third point(P3). A weaving angle is gradually reduced from the first point to the second point around a horizontal line. A weaving angle becomes 0 degree to the second point on the horizontal line.

Description

Weaving control method used when it processes weld for connecting pipes}

The present invention relates to a welding method of a steel pipe connecting the pipes by welding while one steel pipe is inserted into the other steel pipe.

Applicant developed the technology to maximize the durability of piping system by securing the workability, economical efficiency and safety and improving the quality of welded joints by automatically performing piping and welding when constructing large steel pipes in all site conditions such as general soil section or temporary facility section. Continues.

Based on the results of this research and development, the applicant has applied for a number of patents related to the automatic connection of steel pipes, including "steel pipe construction method (Patent No. 440555)" and "steel pipe orthopedic device (Patent No. 598551)". Acquired.

In general, the steel pipe connection is mainly used in the connection method of the water polo / plug type and the butt connection method, it is common to connect both methods by the welding method.

1 and 2 is a schematic perspective view and a cross-sectional view showing a conventional water pipe / insert type steel pipe connection method.

Referring to this, the water pipe / insert type steel pipe connection method welds a part having a step on the inner surface and the outer surface of the steel pipe joint while the end of the other steel pipe P2 is inserted into the end of one steel pipe P1. This is how you connect.

In FIG. 2, reference numeral 100 schematically illustrates a steel pipe outer surface welding apparatus for performing a welding operation on a steel pipe joint in a state where a circumference of a steel pipe is mounted.

In connection with such a welding method, the present applicant has developed a patent for "automatic welding device for steel pipe outer surface welding robot (patent no.778275)", "welding device for welding the outer surface of steel pipe (patent 829993)", and the like. have.

The present applicant is not limited thereto, and various researches and developments are being conducted to improve welding workability and to secure higher welding quality when welding steel pipe.

In particular, the welding method of the steel pipe joint should be welded to the circular structure. In the conventional method, when welding the entire steel pipe including the lower part of the steel pipe, the welding beads flow down due to the gravity, etc. There was a problem that it is not easy to ensure the uniform welding quality due to the overlap.

Accordingly, there is a demand for a welding method capable of uniformly welding the upper portion of the steel pipe joint and the lower portion of the steel pipe joint without degrading the welding quality, and further improving the productivity and economy by performing a faster welding operation.

The present invention has been made in order to solve the above problems, and when welding the steel pipe connection circumferential welding, while ensuring the overall uniform and excellent welding quality, and also when welding the steel pipe connection that can contribute to the improvement of welding productivity and economic efficiency by rapid and accurate welding An object of the present invention is to provide an applied weaving control method.

Weaving control method applied when welding the steel pipe connecting portion according to the present invention for realizing the above object, in the steel pipe welding method for welding and connecting the steel pipe connecting portion of the state in which one steel pipe is inserted into the other steel pipe, In the circumferential direction of the uppermost point in the circumferential direction of welding from the lowest point to the highest point in one direction of welding, the lowest point of the steel pipe connection is the first point, 90 degrees from the lowest point to the circumferential direction above the second point When the highest point, which is 90 ° from the second point, is the third point, the weaving direction setting in the upstream welding is from the first point to the second point, from the first point to the horizontal line downward from the first point. After starting to be inclined by X ° and gradually decreasing to the second point, it becomes 0 ° with respect to the horizontal line at the second point, and from the second point to the third point After the weaving angle gradually increases from the second point about the horizontal line starting from 0 ° to the third point, it is set to be inclined by Y ° above the horizontal line with respect to the horizontal line at the third point, where X ° and Y ° are It is characterized by being set at an angle greater than 0 ° and less than 90 °.

In the above, Y ° may be set at an angle greater than X °.

In addition, the Y and X is preferably set within 45 degrees.

The weaving angle of each section may be set to an angle between the X ° and Y ° in the 180 ° section from the first point to the third point.

On the other hand, in the weaving control method, the speed in the weaving width direction gradually decreases from the first point to the second point, and after the speed in the weaving width direction is minimum at the second point, the third point is again at the second point. It is preferable that the weaving width direction speed is gradually set to increase gradually.

In addition, the weaving control method, the stopping time of the welding torch at the relatively high end of the left and right ends during the weaving operation is controlled longer than the stopping time of the welding torch at the end of the relatively low position , The stopping time of the left and right ends is preferably set to be the same at the second point where the weaving motion is horizontal.

Further, in the weaving control method, the speed setting in the weaving width direction may be performed at a relatively fast first speed in a lower section lower than the horizontal line with respect to the center line when the line passing through the center portion of the weaving width direction is a center line. In the upper section higher than the horizontal line, it is preferable to be controlled to move at a second speed relatively lower than the first speed.

At this time, the weaving width direction speed, the closer to the first point and the third point, the greater the difference between the first speed and the second speed, the closer to the second point, the difference between the first speed and the second speed Is relatively small, and controlled to be zero at the second point.

Weaving control method applied when welding the steel pipe connecting portion according to the present invention for realizing the above object, in the steel pipe welding method for welding and connecting the steel pipe connecting portion of the state in which one steel pipe is inserted into the other steel pipe, In the circumferential direction of the uppermost point in the circumferential direction of welding from the lowest point to the highest point in one direction of welding, the lowest point of the steel pipe connection is the first point, 90 degrees from the lowest point to the circumferential direction above the second point In this case, the setting of the weaving direction at the time of the upstream welding starts from the first point to the second point and starts to be inclined downward by X ° with respect to the horizontal line from the first point to the horizontal line and then gradually decreases to the second point. 0 ° with respect to the horizon at the second point, wherein X ° is set to an angle greater than 0 ° and less than 90 ° .

The main problem solving means of the present invention as described above, will be described in more detail and clearly through examples such as 'details for the implementation of the invention', or the accompanying 'drawings' to be described below, wherein In addition to the main problem solving means as described above, various problem solving means according to the present invention will be further presented and described.

The weaving control method applied at the time of welding the steel pipe connection according to the present invention is configured to weld the weaving direction appropriately according to the welding position in the circumferential direction. Since welding is performed in the inclined direction, welding can be performed while minimizing the overlapping phenomenon with the lumber generated as the welding bead flows down, thereby enabling a more uniform welding as a whole and achieving excellent welding quality. It can be effective.

In addition, the present invention, by varying the welding speed of the upper region and the lower region relatively in the weaving width direction, because the welding bead does not flow out of the welding region, the welding is made while being formed in the welding region, the overall uniform and good welding quality It can be secured, and the amount of welding wire can be reduced, thereby making it possible to perform an economical and efficient welding operation.

1 is a perspective view showing a connection method of a general water polo / insert type steel pipe,
2 is a cross-sectional view showing a common steel pipe outer surface welding state,
3 is a front view of a welding apparatus according to the present invention,
4 is a plan view of a welding apparatus according to the present invention,
5 is a schematic view continuously showing a welding process using a welding apparatus according to the present invention,
6 is a cross-sectional view and a detailed view of the AA line direction of Figure 2 for explaining the weaving control method according to the present invention;
7 is a cross-sectional view for explaining a section weaving control method according to the present invention;
8 and 9 are views for explaining a weaving width direction adjustment method in the weaving control method according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

3 and 4 are a front view and a plan view showing a welding apparatus for realizing the weaving control method according to the present invention.

First, a welding apparatus will be described with reference to FIGS. 3 to 4.

3 and 4, reference numeral 10 denotes a welding torch.

The welding torch 10 is mounted to the torch clamp 12, and the torch clamp 12 is configured to enable the weaving operation, ie, the reciprocating motion in the left and right width directions, by the weaving motor 15.

Reference numeral 13 denotes a clamp plate provided between the torch clamp 12 and the weaving motor 15, and reference numeral 14 denotes a motor clamp connected to the clamp plate 13 to which the weaving motor 15 is mounted.

Therefore, referring to FIG. 3, the weaving operation during welding is performed by the weaving motor 15 operating in the clamp plate 13, the torch clamp 12, and the welding torch 10 about the center C in the horizontal width direction. Weaving is achieved while reciprocating.

Reference numeral 17 denotes a support plate for supporting the weaving motor 15, to which the devices for adjusting the weaving direction (weaving angle with respect to the horizontal line) of the welding torch 10 are connected. 19 denotes the weaving angle adjustment gear, and reference numeral 20 denotes the weaving angle control motor. Reference numeral 22 is a drive gear provided in the weaving angle control motor 20, and is configured to transmit a rotational force to the weaving angle adjusting gear 19.

Devices for adjusting the weaving direction are operated while being supported on the fixed plate 25. When the weaving angle control motor 20 is operated, the weaving angle adjusting gear 19 rotates as the driving gear 22 rotates. As the weaving angle adjusting gear 19 rotates, including the support plate 17, the weaving motor 15, the motor clamp 14, the clamp plate 13, the torch clamp 12, and the welding torch ( The weaving direction is adjusted while the 10) is integrally rotated.

In the drawings of the present embodiment, the illustration of the welding wire connection and supply structure is omitted, the welding wire is supplied while being connected to the welding torch around the feeder, such a configuration is well known, the detailed description thereof will be omitted. .

On the other hand, the weaving angle control motor 20 and the fixed plate 25 is preferably installed to be supported on a welding carriage (not shown) for transporting the welding device as described above.

The welding carriage is a part configured to perform a welding operation while moving along the circumference of the steel pipe, and the detailed description thereof is omitted since it is well known including the patented invention.

Figure 5 is a schematic view showing a welding method using the welding device as described above, when the upper welding from the lower section to the upper section of the steel pipe connection using the welding device (1), the weaving direction according to the welding position is It is a diagram continuously illustrating the process of welding while being changed.

In FIG. 5, CL represents the welding center line of the connection part (joint part) of a steel pipe.

Meanwhile, the welding apparatus according to the present invention described with reference to FIGS. 3 to 5 is only one example, and the weaving control method described below is not limited to the method of using the welding apparatus, and is welded while adjusting the weaving direction. Of course, it can be carried out using any known welding apparatus that can be.

The welding method of the present invention is a welding method that can be applied to a water pipe / insert type steel pipe connection method as shown in FIGS. 1 and 2, and will be described in detail with respect to a weaving control method applied when welding a steel pipe connection. same.

FIG. 6 is a cross-sectional view taken along the line A-A of FIG. 2 and described with reference to this. FIG.

First, upstream welding is performed in either direction from the lowest lowest point in the circumferential direction of the steel pipe connection to the highest highest point. That is, upstream welding is performed on both sides by dividing the 180 ° section counterclockwise and clockwise from the lowest point.

In FIG. 6, the structure for performing the upward welding in the counterclockwise direction is shown. Since the upward welding in the clockwise direction can be applied in the same manner as the upward welding in the counterclockwise direction, the upward welding in the clockwise direction is omitted. 6, only the upstream welding in the counterclockwise direction will be described.

Referring to FIG. 6, the lowest point of the steel pipe connecting portion is the first point P1, the 90 ° point from the lowest point in the circumferential direction upward, the second point P2, and the 180 ° point from the first point in the circumferential direction upward. If the highest point that is 90 ° from the second point P2 is called the third point P3,

The setting of the weaving direction in the upstream welding starts from -X ° with respect to the tangential direction of the steel pipe, that is, the horizontal line h, from the first point P1 to the second point P2 from the first point P1 to the second point P2. After gradually decreasing to the second point P2, it becomes 0 ° at the second point P2, and from the second point P2 to the third point P3 starts at 0 ° at the second point P2 After gradually increasing to the third point P3, it is preferable that the third point P3 is set to finish at + Y ° with respect to the horizontal line h.

At this time, since X ° and Y ° are set to an angle larger than 0 ° and smaller than 90 °, the weaving direction angle as a whole is set in the range between -90 ° and + 90 °. More preferably, the weaving direction angle is set in the range of -45 ° to + 45 °.

X ° and Y ° at the welding start position and at the welding completion position may be the same angle (in absolute value), or Y ° may be set to an angle (in absolute value) larger than X ° depending on the implementation conditions. For example, X ° and Y ° can both be set to an angle of 45 ° (ie -45 ° and 45 °) at the same angle, and X ° is 30 ° (absolute) at different angles. Value), Y ° can be set at an angle of 45 °.

In the above-described weaving direction setting, the angle may be linearly changed from the first point P1 to the third point P3. However, the weaving direction may be set to be changed step by step depending on the conditions. It is possible.

That is, in a 180 ° section from the first point (P1) to the third point (P3) is divided into a plurality of sections for each predetermined angle (different angles are possible), and the weaving direction angle of each section is at -X ° It can be set to change in steps within an angle range between + Y °.

For example, referring to FIG. 7, the 30 ° section from the first point P1 sets the angle in the weaving direction to -30 °, and the 30 ° to 60 ° section sets the weaving direction angle to -15 °. In addition, at 60 °, the angle in the weaving direction is set to 0 ° at the 30 ° point from the second point P2 via the second point P2. Then, the 30 ° to 60 ° section at the second point P2 sets the weaving direction angle to 20 °, and sets the angle to 45 ° from 60 ° to the third point P3. This is just one example, it is preferable to set the angle in the appropriate weaving direction according to the implementation conditions.

As described above, by welding by setting the weaving direction according to the welding section, the weaving direction is moved in the horizontal direction in the lowermost section and the uppermost section, and welding is performed in an inclined direction. Welding can be performed while minimizing the overlap with wood chips. As a result, uniform welding is possible as a whole and excellent welding quality can be realized.

Now, together with the setting of the weaving direction according to the welding position as described above, the speed in the weaving width direction according to the welding position and the stop setting of the left and right ends of the weaving will be described.

First, in the speed control in the weaving width direction according to the welding position, referring to FIG. 6, the speed in the weaving width direction gradually decreases from the first point P1 to the second point P2, and the second point P2. After the speed in the weaving width direction is minimized at), it is preferable that the weaving width direction speed is gradually set higher from the second point P2 to the third point P3.

The speed control in the weaving width direction according to the welding position decreases linearly from the first point P1 to the second point P2, and then linearly from the second point P2 to the third point P3. Can be controlled to increase.

Unlike this, as shown in FIG. 7, in a 180 ° section from the first point P1 to the third point P3, the display section is divided into a plurality of sections for each predetermined angle (different angles are possible), and the weaving width in each section is shown. It is also possible to set the speed of the direction to decrease or increase step by step.

As described above, the speed control in the weaving width direction according to the welding position is longer in the weaving width direction length as the first point P1 and the third point P3 are closer, and the weaving width direction is closer to the second point P2. Since the width direction length becomes short, in consideration of this point, the position in the long length of the weaving width direction is relatively fast and the speed in the weaving width direction is relatively slow at the position where the length of the weaving width direction is short. It is possible to form a uniform weld bead in the entire section.

Next, the stop setting of the left and right ends of the weaving will be described.

8 and 9, the stop setting of the left and right ends of the weaving, the relatively high position of the left and right ends of the welding torch to move, that is, the left and right ends during the weaving operation (hereinafter referred to as 'top end') The stop time at (T) is controlled to be longer than the stop time at the lower end (hereinafter referred to as 'lower end') (D) having a lower position.

Normally, the weaving operation during welding causes welding while the welding torch reciprocates from side to side. At the left and right ends of the weaving (T, D), the welding torch is momentarily stopped and the weaving movement is continued while switching in the reverse direction. .

At this time, in the present invention, the stop time at the upper end portion T of the left and right ends is set longer, and the stop time at the lower end portion D is set shorter. At the second point P2 where the weaving motion is horizontal, the stopping time of the left and right ends is set to be the same. For example, if the stop time at the upper end portion T is 0.5 second at the first point P1 and the third point P3, the stop time at the lower end portion D is set to 0.1 second. At the second point where the weaving motion is horizontal, the stop time of the left and right ends may be set to 0.2 seconds.

In addition, the stop time at the upper end portion T from the first point P1 to the second point P2 may be set to decrease linearly or decrease in stages, and the third point P3 at the second point P2. The stop time at the upper end T may be linearly increased or set to increase stepwise.

In the same way, the stopping time at the lower end D from the first point P1 to the second point P2 and the stopping time at the upper end T from the second point P2 to the third point P3. May be set to increase or decrease linearly or in steps.

Therefore, in the lower end part D, since the welding bead flows down to the outer surface or the lower side of a steel pipe by gravity, welding is performed while moving quickly by shortening a stop time relatively, and a welding bead flows in the upper end part T. Even if it lowers, since it flows into the lower space in a welding area, welding is performed, making relatively long stop time.

As a result, the welding bead does not flow out of the welding area but is uniformly formed in the welding area by the speed control in the weaving width direction according to the welding position as described above, and the stop setting control of the weaving left and right ends. It is possible to ensure a uniform and good welding quality as a whole, and to reduce the amount of welding wire used, which enables economic and efficient welding operation.

On the other hand, the steel pipe welding is usually performed in a plurality of passes (bar) welding, it is preferable to weld while repeating the weaving control method according to the present invention as described above when welding in a plurality of passes.

In addition, the above-described weaving control method of the present invention is applicable to all welding methods for performing welding while weaving operation. For example, it can be applied to electric welding (ARC), CO 2 welding, TIG welding, gas welding and the like.

As described above, the technical idea described in the embodiments of the present invention may be implemented independently, or may be implemented in combination with each other. In addition, the present invention has been described through the embodiments described in the drawings and the detailed description of the invention, which is merely exemplary, and those skilled in the art to which the present invention pertains various modifications and equivalent other embodiments therefrom It is possible. Accordingly, the technical scope of the present invention should be determined by the appended claims.

Claims (7)

In the steel pipe welding method in which one steel pipe is welded and connected to a steel pipe connecting state inserted into the other steel pipe,
In the circumferential direction of the steel pipe connection, perform an upward welding welding in one direction from the lowest lowest point to the highest highest point,
If the lowest point of the steel pipe connection is the first point, the third point is 90 degrees from the lowest point in the circumferential direction upward and the third point is 90 degrees from the second point.
Weaving direction setting at the time of upstream welding,
From the first point to the second point, the first point begins to be inclined downward by X ° with respect to the horizontal line with respect to the horizontal line and gradually decreases to the second point, and then becomes 0 ° with respect to the horizontal line at the second point,
From the second point to the third point, the weaving angle is gradually increased upward from the second point about the horizontal line starting from 0 ° from the second point, and then set to be inclined by Y ° above the horizontal line with respect to the horizontal line at the third point,
Weaving control method is applied when welding the steel pipe connection, characterized in that X ° and Y ° is set to an angle greater than 0 ° and less than 90 °.
The method according to claim 1,
Weaving control method applied when welding a steel pipe connection, characterized in that Y ° is set at an angle greater than X °.
The method according to claim 1,
Weaving control method is applied when welding the steel pipe connection, characterized in that Y ° and X ° is set within 45 ° around the horizontal line.
The method according to claim 1,
Weaving applied to the welded steel pipe connection, characterized in that the weaving direction of each section is divided into a plurality of sections in the 180 ° section from the first point to the third point is set at an angle between the X ° and Y ° Control method.
The method according to any one of claims 1 to 4,
In the weaving control method, the speed in the weaving width direction decreases gradually from the first point to the second point, and after the speed in the weaving width direction is minimized at the second point, the second weaving point is moved from the second point to the third point. Weaving control method applied when welding the steel pipe connection, characterized in that the weaving width direction is set to gradually increase.
The method according to any one of claims 1 to 4,
The weaving control method, the stop time of the welding torch at the end of the relatively high position of the left and right ends during the weaving operation is controlled longer than the stop time of the welding torch at the end of the relatively low position,
Weaving control method is applied when welding the steel pipe connection, characterized in that the stop time of the left and right ends are set to be the same at the second point where the weaving motion is horizontal.
In the steel pipe welding method in which one steel pipe is welded and connected to a steel pipe connecting state inserted into the other steel pipe,
In the circumferential direction of the steel pipe connection, perform an upward welding welding in one direction from the lowest lowest point to the highest highest point,
If the lowest point of the steel pipe connection is the first point, the second point 90 ° from the lowest point in the circumferential direction above the second point,
Weaving direction setting at the time of upstream welding,
From the first point to the second point, the first point begins to be inclined downward by X ° with respect to the horizontal line with respect to the horizontal line and gradually decreases to the second point, and then becomes 0 ° with respect to the horizontal line at the second point,
Weaving control method is applied when welding the steel pipe connection, characterized in that X ° is set at an angle greater than 0 ° and less than 90 °.

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