KR101116020B1 - Device for forming back bead and welding apparatus having the same - Google Patents

Abstract

Disclosed is a back bead forming apparatus for a welder for forming a back bead formed at a welded portion facing a welding torch portion in welding a welding object. The back bead forming apparatus of the welding machine according to the present invention is coupled to the guide portion detachably mounted to the outer periphery of the welding object, and is adjacent to the movement trajectory of the welding torch portion installed in the carriage portion moving along the circumferential direction of the welding object. A fixed body fixed to the carriage part so as to be positioned so as to be positioned, a molded member for forming the back bead while being opposed to the back video formed on the welded portion, which is trailing to the welding torch, and at least for connecting and supporting the fixed body and the molded member. It may include one support member, and an elastic member provided between the fixed body and the molding member.

Welding machine, back bead, welding, nozzle, forming block, forming roller

Description

Back bead forming apparatus and welding machine having the same {DEVICE FOR FORMING BACK BEAD AND WELDING APPARATUS HAVING THE SAME}

The present invention relates to a back bead forming apparatus of a welder, and more particularly, to a back bead forming apparatus for forming a back bead formed on a welding portion facing the welding torch portion in welding a welding object, and a welder having the same. will be.

In general, an orbital welder is a device that performs welding by rotating along the circumference of a welding object having a cylindrical shape such as a tube or a pipe.

These orbital welders are used until recently where the high quality of the most important welds is needed. This requirement is also applied in industries where the appearance of welds as well as mechanical strength and X-ray quality is important. Used by the user's needs as needed. Therefore, orbital welding machines are mainly used in the chemical industry, pharmaceutical industry, bio industry, high purity water or gas circulation system, semiconductor industry, aviation, aerospace industry and shipbuilding industry requiring high quality.

When a welding operation is performed on a pipe while the welding torch unit moves from side to side in a conventional orbital welding machine, a back bead is formed on a rear surface of a welding portion facing the welding torch unit. At this time, the arc force by the welding torch unit 400 pushes the molten metal so that the back bead (a) is convex and when the arc passes, the non-solidified molten metal is struck toward the bead surface by gravity and the back bead (a). Is recessed. Therefore, there is a problem in that the back bead is formed nonuniform as a whole and the welding failure rate is high.

The present invention has been made in order to solve the above problems, it is possible to convexly form a back bead formed in the back surface of the welding portion facing the welding torch while being welded to the welding torch in the welding object. It is an object to provide a back bead molding apparatus.

Another object of the present invention is to provide a welding machine having the back bead forming apparatus.

The objects of the present invention are not limited to the above-mentioned objects, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

Welding machine according to a preferred embodiment of the present invention for achieving the above object, the guide portion detachably mounted to the outer periphery of the welding object, the carriage portion coupled to the guide portion to be movable along the circumferential direction of the welding object And a welding torch unit for welding to the welding object, and installed in the carriage unit so as to be adjacent to a moving trajectory back of the welding torch unit, and trailing the welding torch unit. It may include a back bead molding unit for forming a back bead (back bead) formed on the welded portion of the welding object facing the teeth.

The back bead forming unit serves to convexly form the recessed back bead by pushing toward the rear surface while being in contact with the surface bead melted by the welding torch unit and struck downward.

Here, the back bead forming unit, a fixed body coupled to the carriage portion to be located behind the welding torch portion, a molding member for forming the back bead while contacting the welding portion to face the back bead, the fixed body and the It may include at least one support member for connecting and supporting between the molding member, and an elastic member provided between the fixed body and the molding member.

In addition, the bracket to which the welding torch unit is mounted may be coupled to the carriage unit, and the fixing body may be inserted into the slide groove formed in the bracket.

In one embodiment of the molding member, one surface facing the back bead may be configured in the form of a forming block having a curved surface corresponding to the outer periphery of the welding object.

Here, the forming block may be hinged to the fixing piece fixed to the end of the support member.

Another embodiment of the molding member, it may be configured in the form of a roller to be rollably coupled to a fixed piece fixed to the end of the support member.

The elastic member is preferably a spring formed in the longitudinal direction of the support member in the outer diameter of the support member.

The back bead forming apparatus of the welding machine according to the present invention is coupled to the guide part detachably mounted to the outer periphery of the welding object, and is located behind the movement trajectory of the welding torch part installed in the carriage part moving along the circumferential direction of the welding object. A fixed body fixed to the carriage part so as to be adjacent to each other, a molding member following the welding torch part and contacting with the back bead formed at the welding part to form the back bead, and connecting the fixing body to the molding member. At least one support member for supporting by, and may include an elastic member provided between the fixed body and the molding member.

Specific details of other embodiments are included in the detailed description and the drawings.

According to the present invention as described above, the molding member of the back bead forming apparatus located adjacent to the movement trajectory of the welding torch provided in the welding machine is pushed back toward the rear surface by pushing the surface bead hit by gravity while following the arc. The beads are shaped to be appropriately concave and the back beads are also appropriately convex. Therefore, the back bead of the welded portion through which the arc passes is uniformly formed, thereby minimizing the welding failure rate.

In addition, when the hot back metal is pushed while contacting the hot molten metal and the hot solidified beads with the cooled back bead forming apparatus, the back bead can be convexly formed and the cooling can be accelerated.

The effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms, only the embodiments are to make the disclosure of the present invention complete, and the general knowledge in the art to which the present invention belongs It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Prior to the description, the welder of the present invention includes not only an orbital welder that performs welding by rotating along the circumference of a welding object having a cylindrical shape, such as a tube or a pipe, but also includes a general welder.

Hereinafter, a welding machine according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid unnecessarily obscuring the subject matter of the present invention.

1 is a schematic perspective view of a welding machine according to the present invention, FIG. 2 is a detailed view of the portion A of FIG. 1, FIG. 3 is a detail view of the guide part shown in FIG. 2, and FIG. 4 is a carriage part and welding shown in FIG. 2. It is a detailed view of a torch part.

1 to 4, the welding machine 10 according to the present invention is the main body 100, the guide portion 200, the carriage portion 300, the welding torch portion 400 and the back bead forming portion 500 ) May be included.

The main body 100 includes a movement operation of the power supply unit 110 and the carriage unit 300, adjustment of the position of the welding torch unit 400, adjustment of the flow rate of the shield gas supplied to the welding torch unit 400, setting of welding conditions, and the like. The control unit 120 may be provided.

In addition, one side of the main body 100 may be fixed to the wire supply device 130 for supplying a wire to the wire supply port 331 to be described later.

In addition, a remote control unit for remotely controlling the operation of the carriage unit 300, adjusting the position of the welding torch unit 400, adjusting the flow rate of the shield gas, and welding conditions may be connected to the main body 100. Can be.

Here, since the main body 100 of the welder 10 can be understood by a known technique, detailed description thereof will be omitted.

The guide part 200 is detachably mounted to the outer periphery of the welding object 1. Here, the welding object 1 may include a cylindrical metal pipe P and the like.

The guide part 200 may be configured of a guide body 210, a guide rail 220, a clamping member 230, and the like.

The guide body 210 is made up of a pair of semi-circular rings and each end is hinged and the other end is engaged to open and close detachably mounted on the outer circumference of the pipe (P). Here, one side of the inner wall of the guide body 210 may be provided with a fixing bracket 240 in contact with the outer surface of the pipe (P) to press the pipe (P) to the other side of the inner wall of the guide body 210 to be fixed. At this time, tightening and releasing the bolt of the fixing bracket 240 can be finely adjusted according to the roundness of the metal pipe (P).

The guide rail 220 is installed in a circular ring shape along the circumference at one end of the guide body 210.

The clamping member 230 is installed to be movable in the circumferential direction of the pipe P along the guide rail 220, and a carriage 300 to be described later is fixed to one side.

The carriage unit 300 is fixed to the clamping member 230 of the guide unit 200 to be movable along the circumferential direction of the pipe (P).

The carriage unit 300 is provided with a carriage body 310 fixed to the clamping member 230 of the guide unit 200 and a carriage body 310 to adjust horizontal and vertical directions of the welding torch unit 400 to be described later. It may include a driving unit 320 and the like.

Here, the driving unit 320 is a first drive motor 321 and the first to control the horizontal movement of the welding torch 400, front and rear, left and right so that the welding position of the welding torch 400 can be adjusted. The second driving motor 325 and the second moving member 327 for controlling the vertical movement of the welding torch unit 400 so that the movable member 323 and the appropriate arc length of the welding torch unit 400 can be adjusted. It can be configured as.

In addition, the welding member 400, the back bead forming part 500, and the bracket 330 to which the wire feeding hole 331 is mounted may be coupled to the second moving member 327 of the carriage part 300. . Here, the bracket 330 preferably has an arc shape for adjusting the angle between the welding torch 400 and the wire feed port 331. In addition, the bracket 330, the fixed body 401 of the welding torch unit 400, the fixed body 510 of the back bead forming unit 500 and the fixing piece 333 of the wire feed port 331 is inserted into the slide movement It is preferable that the slide groove 330a is formed so that adjustment can be possible.

The welding torch unit 400 is mounted to the bracket 330 fixed to the carriage unit 300 to perform welding to the pipe (P).

The welding torch unit 400 is connected to a gas supply hose (not shown) and is provided with a nozzle body 410 for guiding discharge of the shield gas, and is installed at the center of the nozzle body 410 to cause arc discharge through electricity to the gas. It may be composed of a welding electrode 420.

The back bead forming unit 500 is a back bead (reference numeral a in FIG. 10) formed on the welded portion of the pipe (P) facing the welding torch unit 400 while trailing the welding torch unit 400. It serves to mold. More specifically, the back bead forming part 500 is pushed toward the rear surface while contacting with the surface bead b that is melted by the welding torch part 400 and struck downward, and convexly forms the recessed back bead a. do.

The back bead forming part 500 is installed in the bracket 330 of the carriage part 300 so as to be located adjacent to the rear of the moving trajectory of the welding torch part 400.

5 is a perspective view showing an embodiment of the back bead forming unit provided in the welding machine according to the present invention, Figure 6 is an exploded perspective view of FIG.

As shown in FIGS. 5 and 6, the back bead molding unit (or back bead molding apparatus) 500 may include a fixed body 510, a molding member 520, a support member 530, an elastic member 540, and the like. It may be configured as.

The fixed body 510 is coupled to the carriage 300 so as to be adjacent to the rear of the movement trajectory of the welding torch 400. Here, the fixed body 510 is preferably inserted into the slide groove 330a of the bracket 330 coupled with the carriage unit 300 is detachably coupled.

The molding member 520 contacts the welding part of the pipe P to face the back bead a to form the back bead a. In the present embodiment, the molding member 520 is made of a chromium copper material, but not limited thereto, it is sufficient to use a material having excellent heat resistance.

The molding member 520 may be a molding block 521 having one surface facing the back bead qa and a curved surface corresponding to the outer circumference of the pipe P. The forming block 521 may be coupled to the fixing piece 531 is fixed to the end of the support member 530 to be described later with a hinge pin (533).

At least one support member 530 may be provided to connect and support the fixed body 510 and the molding member 520. For example, in the present embodiment, two support members 530 are arranged in the English letter V shape, and each end is fixed to be spaced apart from the fixed body 510, and the other end is fixed to be collected at the fixed piece 531. Although illustrated, the present invention is not limited thereto and may have various types of support structures.

The elastic member 540 is provided between the fixed body 510 and the molding member 520 to provide elasticity to the molding member 520. For example, the elastic member 540 may be a coil spring wound around the outer diameter of the support member 530 and formed in the longitudinal direction of the support member 530.

7 is a perspective view showing another embodiment of the back bead forming unit provided in the welding machine according to the present invention, Figure 8 is an exploded perspective view of FIG.

As shown in Figure 7 and 8, the back bead molded part 500 according to another embodiment of the present invention is a fixed body 510, the molding member 520, the support member 530 and the elastic member 540 Etc., except that the forming member 520 is configured in the form of a forming roller 522, and is the same as the back bead forming unit according to the embodiment described with reference to FIGS. 6 and 7. Therefore, the same reference protection for the components that perform the same function as the embodiment, and the detailed description thereof will be omitted.

Forming roller 522 is rollably coupled to a fixed piece 531 fixed to the end of the support member 530, the back bead (a) while contacting the welding portion of the pipe (P) to face the back bead (a) Molding.

The back bead forming apparatus 500 of the welding machine 10 according to the present invention is coupled to the guide portion 200 detachably mounted to the outer periphery of the welding object 1 along the circumferential direction of the welding object 1. A fixed body 510 fixed to the carriage unit 300 and a welding torch unit 400 so as to be located adjacent to the rear of the moving trajectory of the welding torch unit 400 installed in the moving carriage unit 300, and the welding unit Forming member 520 for forming the back bead (a) while facing the bead (a) formed thereon, and at least one support member for connecting and supporting between the fixed body 510 and the forming member 520 530 and an elastic member 540 provided between the fixed body 510 and the molding member 520. Here, since the fixing body 510, the molding member 520, the support member 530 and the elastic member 540 has been described with reference to Figures 5 to 8, detailed description thereof will be omitted.

9 is a schematic view for explaining the welding section setting of the welding machine according to the present invention.

Referring to FIG. 9, a welding condition may be set by dividing a cross section of the pipe P into a maximum of 36 sections in units of 10 degrees in the circumferential direction. Here, the welding condition may include welding current in CW mode and pulse mode, welding frequency in pulse mode, welding speed, shield gas flow rate, wire feeding speed, oscillation, and the like.

When welding is performed through the remote controller 140 after setting the welding conditions of each welding section, an arc occurs in the welding torch unit 400 and the carriage unit 300 guides the guide rails 220 of the guide unit 200. The pipe P welding starts while moving along. At this time, while the operator continuously observes the behavior of the molten pool, by operating the remote control 140 to maintain the melt position (seam) position and arc length of the welding torch unit 400 in an optimal state. If necessary, the size of the melt pool can be adjusted by adjusting the welding current.

10 is an exemplary view for explaining the operation of the back bead molded part of the welding machine according to an embodiment of the present invention.

As shown in FIG. 10, the arc force by the welding torch unit 400 pushes the molten metal so that the back bead a is convex, and when the arc passes, the non-solidified molten metal is pushed toward the bead surface by gravity. As a result, a phenomenon occurs in which the back bead a is concave and becomes a dotted line shown in the weld bead. At this time, the forming block 521 of the back bead forming unit 500, which is located adjacent to the movement trajectory of the welding torch unit 400, follows the back of the arc and pushes the surface bead struck by gravity back toward the rear surface. In addition, the surface bead (b) is appropriately concave and the back bead (a) is also formed to be appropriately convex to be molded in the form of contact with the back bead molding portion 500. In addition, when the high temperature molten metal and the high temperature solidified beads are pressed while being pushed by the cooled back bead forming unit 500, the back bead a may be convexly formed and the cooling may be accelerated.

11 is an exemplary view for explaining the operation of the back bead molded part of the welding machine according to another embodiment of the present invention.

As shown in FIG. 11, the surface bead b hitting the gravity while the forming roller 522 of the back bead forming unit 500 positioned adjacent to the rear of the movement trajectory of the welding torch unit 400 is followed by the arc. By pushing the back toward the back, the surface bead (b) is formed to be appropriately concave and the back bead (a) is also appropriately convex to be molded in the form in contact with the back bead forming portion 500.

Although not shown in the drawings, as described above, when welding the groove while filling the groove with the wire W after the back bead forming the wire W through the wire supply unit 130 in the main body 100 of the welder 10 ) And the wire (W) is filled in the groove while melting the arc through the wire supply port 331. At this time, since the groove becomes larger as it goes upward, the groove corresponds to the width widened by using the oscillation function. In addition, when welding the molten wire (W) while filling, the height of the bead is increased contact point and the arc length in the trailing pass is shortened. However, the automatic arc length control device (AVC) allows welding while maintaining a constant arc length at all times.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts are included in the scope of the present invention. Should be.

1 is a schematic perspective view of a welding machine according to a preferred embodiment of the present invention;

2 is a detailed view of the portion A of FIG.

3 is a detailed view of the guide unit shown in FIG. 2;

4 is a detailed view of the carriage part and the welding torch part shown in FIG.

5 is a perspective view showing an embodiment of a back bead molding unit provided in the welding machine according to the present invention;

6 is an exploded perspective view of FIG. 5;

7 is a perspective view showing another embodiment of the back bead molding unit provided in the welding machine according to the present invention;

8 is an exploded perspective view of FIG. 7;

9 is a schematic view for explaining the welding section setting of the welding machine according to the present invention,

10 is an exemplary view for explaining the operation of the back bead molded part of the welding machine according to an embodiment of the present invention,

11 is an exemplary view for explaining the operation of the back bead molded part of the welding machine according to another embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: welding machine 100: main body

200: guide portion 300: carriage portion

400: welding torch part 500: back bead molding part (molding apparatus)

510: fixed body 520: molding member

521: forming block 522: forming roller

530: support member 540: elastic member

Claims (12)

A guide part detachably mounted to an outer circumference of a welding object; A carriage part coupled to the guide part to be movable along the circumferential direction of the welding object; A welding torch unit installed in the carriage unit and performing welding to the welding object; And It is installed on the carriage to be located adjacent to the movement trajectory of the welding torch adjacent to the back, and forming a back bead formed on the welded portion of the welding object facing the welding torch portion while trailing the welding torch portion Including a back bead molding part, The back bead forming unit is a fixed body coupled to the carriage to be located behind the welding torch, a forming member for forming the back bead while contacting the welding portion to face the back bead, between the fixed body and the forming member Welder comprising at least one support member for connecting and supporting the elastic member provided between the fixed body and the molding member. The welder according to claim 1, wherein the back bead forming part pushes toward the rear surface while contacting with the surface bead melted by the welding torch part and struck downward. delete The welding machine according to claim 1, wherein the bracket on which the welding torch unit is mounted is coupled to the carriage unit, and the fixing body is inserted into the slide groove formed in the bracket. The welder of claim 1, wherein the molding member is a molding block having one surface facing the back bead corresponding to an outer circumference of the welding target. The welding machine according to claim 5, wherein the forming block is hinged to a fixed piece fixed to an end of the support member. The welding machine according to claim 1, wherein the forming member is a forming roller which is rollably coupled to a fixed piece fixed to an end of the supporting member. delete The welder according to claim 1, wherein the elastic member is a spring formed in the longitudinal direction of the support member at an outer diameter of the support member. Fixed body fixed to the carriage part is coupled to the guide portion detachably mounted to the outer periphery of the welding object to be located adjacent to the movement trajectory rear of the welding torch portion installed in the carriage portion moving along the circumferential direction of the welding object ; A molding member that follows the welding torch and contacts the back bead formed at the welding portion to form the back bead; At least one support member for connecting and supporting the fixed body and the molding member; And It includes an elastic member provided between the fixed body and the molding member, The molding member is a back bead forming apparatus of the welder, characterized in that the surface facing the back bead is a forming block having a curved surface corresponding to the outer periphery of the welding object. delete delete

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