KR20170118020A - Rotating type's welding device - Google Patents

Abstract

The welding apparatus includes a torch frame connected to a welding facility and an electrode rod mounting portion provided at an angle to the torch frame, the electrode rod holder being disposed at a lower central portion of the torch frame, And a driving unit connected to the tilting rod and disposed on the welding facility, for rotating the tilting rod. According to the present invention, movement of the tungsten electrode rod can be secured Thus, it is possible to improve the welding quality of the product by performing welding well in a narrow space.

Description

[0001] The present invention relates to a rotary type of welding device,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a tilting type welding apparatus, and more particularly, to an apparatus capable of improving welding quality by securing movement of a tungsten electrode rod in a narrow space by using a rotating structure.

"Welding" means welding two or more objects or materials to be welded in a molten or semi-molten state, joining the welded material (welding rod) to the welded portion (fusion welding), heating the joint portion to an appropriate temperature A method of bonding by applying pressure in a cold state (pressure welding), or a method of melting a metal having a lower melting point than the base material without melting the whole of the base material and bonding the same with a suction force by surface tension between the joint portions (soldering: Brazing & Soldering ).

On the other hand, GTAW (gas tungsten arc welding) uses arc heat generated by using tungsten electrode rod to melt and bond the base material, and also uses a fugitive material.

At this time, inert gas such as Ar or He is used as a protective gas, so it is called TIG (Tungsten Inert Gas) welding, and productivity is low, but arc is stable and weld quality is excellent, so it is used for welding of material sensitive to oxidation or nitriding .

 Such GTAW is mainly applied to pipe welding in the shipbuilding sector, and is also used for membrane welding of LNG or for forming backside beads of some Butt Joints. It is used for welding of thin plate which does not require post-welding, repair of structure, especially repair work of die casting, repair of non-ferrous metal.

 Such GTAW welders use constant current (DCSP) characteristics and use AC voltage (AC) when welding Al and its alloys. Arc generation uses non-contact high-frequency generation technique and contact generation method. There is also a pulse welder that can adjust the peak current and base current for special purposes and is mainly applied to automatic TIG welding. The pulse current can reduce the amount of heat input to minimize the deformation, have a stable arc, can form a more stable backside bead, are more suitable for electron beam welding, and have a good shape of the molten pool .

In addition, the electrode used for TIG welding must have a high melting point (tungsten melting point: 3410 ° C), low electrical resistance, good thermal conductivity, electron emission capability, and pulse conditions to adjust the peak current and base current , A suitable material for this is tungsten.

 The types and characteristics of the tungsten electrode rod are as follows.

 Pure tungsten electrodes are indicated in green, they are inexpensive and generate stable arc during AC welding. The tungsten electrode rod containing 0.9 - 1.0ThO2 is yellow, and effective arc is generated by thorium oxide. The temperature of the electrode can be kept lower than that of pure tungsten. In addition, tungsten electrodes containing 1.8 - 2.0 ThO2 are marked in red and used mainly as welding electrodes. Tungsten electrodes containing 0.3 - 0.5 ZrO2 are marked with brown and arc is less generated than thorium oxide. However, In addition, the thorium oxide is harmful when grinding the electrode, so the mask must be worn.

 On the other hand, inert gas is basically used as the protective gas.

 The Ar gas has a larger specific gravity than the He gas. In other words, since the gas sinks, the shielding effect can be seen even at a small flow rate. In the case of the upper view welding, the gas flow rate should be increased or He gas should be used, the arc generation is better, Should be welded. Since He gas has a small specific gravity, it is necessary to increase the gas flow rate and to use a higher voltage than Ar, so that it is possible to increase the welding speed, but it is expensive. It is possible to increase the welding speed due to the increase of voltage when hydrogen gas is added and it is effective for metals with high thermal conductivity. It is effective when welding Ni alloy and stainless steel. It should not be used for hydrogen embrittlement base materials such as Al, Cu, Mg. When 1% oxygen is added to Ar, the effect of strengthening the arc is obtained, and when the nitrogen is added, the arc of high temperature is generated during the welding of copper, so that the difficulty of welding due to the high thermal conductivity of copper can be overcome.

The above-mentioned GTAW welding is low in productivity, but it can perform high quality welding work for most metals and non-metal alloys, and does not require special cleaning work such as slag removal after welding, easy observation of arc and molten metal during welding, And it is easy to adjust welding heat input. Therefore, it is good for thin plate welding, and it is easy to weld non-ferrous metal because flux is unnecessary, The workability is good because the observation of the welding condition is easy.

In this case, when welding is performed, welding may be carried out by inserting a tungsten electrode into a narrow space of the base material. In this case, products that reduce the width of the welding apparatus have been developed. However, there is a limit in reducing the width of the welding apparatus. Therefore, there is a limit to the movement of the electrode in order to uniformly weld the entire width of the narrow space.

That is, the movement of the electrode rod is freely enlarged, so that a structure of a welding apparatus capable of maintaining the welding quality even when the welding operation is performed in a narrow space of the base material is required.

Korean Patent Publication No. 10-2014-0132754

SUMMARY OF THE INVENTION The present invention has been made in order to solve the problems of the prior art as described above, and it is an object of the present invention to improve the welding quality of the product by performing the welding well in a narrow space by securing the movement of the tungsten electrode rod by using the rotating structure And to provide a device that can be used in a variety of applications.

According to another aspect of the present invention, there is provided a rotary welding apparatus comprising: an electrode rod holder provided at a lower central portion of the torch frame, the torch frame being connected to a welding facility and the electrode rod mounting portion being inclined at a predetermined angle; A pivot rod disposed at a central portion of the torch frame and connected to the electrode rod holder, and a driving unit connected to the pivot rod and disposed on the welding facility so as to rotate the pivot rod.

Further, in an embodiment of the present invention, the gas injection unit may further include a gas injection unit connected to the gas supply unit, the gas injection unit injecting a protective gas into a gas flow path formed in the upper part of the torch frame, And a gas chamber formed inside the lower portion of the torch frame and connected to the gas flow channel.

In addition, in the embodiment of the present invention, the outer cut portion may be formed at an angle at both sides of the lower portion of the torch frame in which the gas chamber is formed, so that the spraying range of the protective gas is enlarged to the peripheral portion of the electrode.

Further, in the embodiment of the present invention, the inner cutout portion may be formed on the lower center side of the torch frame in which the gas chamber is formed, so as to enlarge the protective gas injection range above the welded portion to form the inactive region.

Further, in the embodiment of the present invention, in order to enlarge the spraying range of the protective gas in the direction opposite to the proceeding direction of the electrode bar, the inner cutout portion in the direction opposite to the advancing direction of the electrode can be further cut than the inner cutout portion in the advancing direction have.

Further, in the embodiment of the present invention, the gas injection unit may further include a diffusion filter disposed under the gas chamber so that the protective gas is uniformly injected into the periphery of the electrode.

Further, in the embodiment of the present invention, the diffusion filter may have a U-shape bent to correspond to the incision angle of the outer cutout portion and the inner cutout portion.

Further, in the embodiment of the present invention, the cooling unit may further include a cooling unit arranged to cooperate with the rotating rod and the electrode rod holder to cool the working electrode rod.

According to an embodiment of the present invention, the cooling portion includes an inner diameter passage connected to the cooling water supply portion and disposed at an inner center portion of the rotary rod, an outer diameter passage formed between the inner diameter passage and the outer peripheral surface of the rotary rod, And a flow hole connected to the outer diameter channel and disposed at an upper end of the electrode rod holder.

Also, in the embodiment of the present invention, the cooling water may be configured to flow through the inner diameter passage and flow out through the outer diameter passage.

According to the present invention, by implementing the pivoting structure using the driving motor, movement of the tungsten electrode rod within a certain angle range can be ensured, so that welding can be performed properly even in a narrow space of the workpiece.

In addition, a cooling channel can be formed in the electrode rod holder to cool the heat received by the tungsten electrode rod during the welding operation, thereby relieving the thermal load of the electrode rod and extending the service life of the electrode rod.

In addition, it is possible to prevent the spark from diffusing into a region other than the welding region by spraying inert protective gas to the peripheral portion of the welding region. At this time, by increasing the cutting angle on the welding direction opposite to the welding direction, it is possible to prevent the spark diffusion in the spot where the tungsten electrode rod passes.

This ultimately facilitates welding work in a narrow space of the welding target material, thereby contributing to ensuring ease of operation and improving welding quality.

1 is a front view of an embodiment of a tilting type welding apparatus according to the present invention;
2 is a partial cross-sectional view of the invention shown in Fig.
Figure 3 is a diagram of a prototype of the invention shown in Figure 1;
FIG. 4 is a view showing a working state of the invention shown in FIG. 1; FIG.
5 is a view showing a welded state of a workpiece to be welded according to the invention shown in Fig.

Hereinafter, preferred embodiments of a welding apparatus according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a front view of an embodiment of a rotating type welding apparatus according to the present invention, Fig. 2 is a partial sectional view of the invention shown in Fig. 1, Fig. 3 is a view of a prototype of the invention shown in Fig. 1, FIG. 5 is a view showing a welded state of a workpiece to be welded according to the invention shown in FIG. 1; FIG.

1 to 5, an embodiment of a tilting type welding apparatus 1200 according to the present invention may include a torch frame 610, an electrode rod holder 620, a tilting rod 640, and a driving unit 641 have.

The torch frame 610 may be connected to a moving device of the welding facility as shown in FIG. More specifically, referring to FIG. 2, the fixing pin 40 is fixedly connected to the connection bracket 30 of the welding equipment, and the upper extension portion 612 can be inserted and fixed to the inside of the welding facility. The upper portion 610b and the lower portion 610a of the torch frame 610 may be bolted together and the upper portion 610b may be processed to reduce the weight of the torch frame 610. [

As shown in FIG. 1, the torch frame 610 may have a wide rectangular shape as viewed from the front, or may have a relatively narrow rectangular shape when viewed from the side, though it is not shown in the drawing. This is to proceed in the lateral direction of the torch frame 610 and enter the narrow space of the material on the welding material.

The electrode rod holder 620 may be provided at an angle? 2 and may be disposed at the center of the lower end of the torch frame 610. Referring to the enlarged view of FIG. 2, it can be seen that the electrode rod 700 is mounted on the electrode mounting portion 621 in an inclined manner. The inclination of the electrode mounting portion 621 may be 30 ° ± 1 ° with respect to the horizontal axis. This is to ensure a range of rotation of the electrode rod 700 mounted obliquely with rotation of the electrode mounting portion 621.

At this time, the inclined angle of the electrode rod 700 mounted with respect to the vertical axis may be? 1. If the electrode mounting portion 621 rotates within a predetermined range in the circumferential direction, the electrode rod 700 can rotate by an angle of? 1.

In the embodiment of the present invention, preferably, the angle of? 1 may be ± 15 °. However, the present invention is not necessarily limited to this, but may be applied at various angles depending on the size of a narrow space of the workpiece to which the rotary type welding apparatus 1200 of the present invention is applied.

The tilting rod 640 may be inserted and fixed at the center of the torch frame 610 and the lower end of the tilting rod 640 may be connected to the electrode rod holder 620. The driving unit 641 may be connected to the tilting rod 640 to rotate the tilting rod 640 and may be disposed on a welding facility.

The driving unit 641 may include a stepping motor 641 and a timing belt (not shown) connected to the shaft of the stepping motor 641 at one side and to the upper end of the rotating rod 640 at the other side . When the user operates the stepping motor 641, the shaft rotates within a certain angle range, and when the timing belt is operated, the rotation path rotates within a certain range.

The electrode rod holder 620 attached to the lower end of the tilting rod 640 also rotates together with the electrode rod 700. The electrode rod 700 moves left and right corresponding to the narrow space of the workpiece to be welded.

Next, an embodiment of the present invention further includes a gas spraying unit 630 for spraying an inert protective gas such as argon gas to the periphery of the electrode rod 700 when the electrode rod 700 is operated, and the gas spraying unit 630 May include a gas flow path 631, a gas chamber 632, and a diffusion filter 633.

The gas channel 631 may be connected to the gas supply unit 630a and may be formed inside the torch frame 610. [ A joint 639, which can be connected to the protective gas hose, may be mounted on the upper end of the gas passage 631. A protective gas hose is connected to the joint 639 and a protective gas is supplied from the gas supply unit 630a to the gas chamber 632. [

The gas chamber 632 may be formed in the lower portion 610a of the torch frame 610 and connected to the gas channel 631. [

Next, the diffusion filter 633 may be disposed below the gas chamber 632 such that the protective gas is uniformly injected into the periphery of the electrode rod 700. The diffusion filter 633 may be provided in a U-shape. The diffusion filter 633 may be a curved U-shape corresponding to the cutting angle of the outer cutout 615 and the cutting angle of the inner cutouts 611 and 613 to be discussed below.

Since the diffusion filter 633 is required to diffuse the protective gas at an angle that is uniformly cut at the outer cutout portion 615 and the inner cutouts 611 and 613, it is preferable that the diffusion filter 633 is bent to correspond to each cutting angle. The shape of the diffusion filter 633 is also necessary for allowing the protective gas to stay in the gas chamber 632 for a certain time to form a certain pressure.

Inert protective gas such as argon gas supplied from the gas supply unit 630a flows into the gas chamber 632 through the gas passage 631. [ The diffusion filter 633 is accumulated in the gas chamber 632 under the resistance of the diffusion filter 633 and is concentrated in the gas chamber 632 by a predetermined amount. The inert protective gas is diffused in a fan shape and is sprayed to the periphery of the electrode rod 700. [

At both ends of the lower portion 610a of the torch frame 610 where the gas chamber 632 is formed, the outer cutout portion 615 is cut at a predetermined angle so that the injection range of the protective gas is enlarged to the peripheral portion of the electrode rod 700. [ Can be formed.

The outer cutout 615 can be cut to 45 degrees or less based on the workpiece surface (assuming relatively horizontal) to be welded. The outer cutout 615 is intended to enlarge the spraying range of the protective gas so that the welding operation can be performed safely without a fire, a burn, or the like, which may be caused by sparks.

If the cutting is performed in excess of 45 degrees, the protective gas is dispersed excessively, and the protective gas may be sprayed to an unnecessary part out of the welding part where the protective gas is mainly to be injected, resulting in waste of protective gas. In addition, it may interfere with the concentrated injection of the protective gas, and the role of the protective gas may be deteriorated.

Therefore, when the outer cutout 615 is incised to 45 degrees or less, the inert region can be stably formed in the peripheral portion of the welded portion without waste of the protective gas.

The inner cutout portions 611 and 613 are formed at the center of the lower portion 610a of the torch frame 610 in which the gas chamber 632 is formed and the inner cutouts 611 and 613 are formed in the direction opposite to the advancing direction of the electrode rod 700 The first inner cutout 611 on the advancing direction side of the electrode rod 700 may be provided further than the second inner cutout 613 on the advancing direction side of the electrode rod 700 so that the injection quantity of the protective gas is enlarged .

This is to prevent the activity due to the spark which may occur in the material to be welded on the rear side of the electrode rod 700 after the welding operation. Since the activity by the material to be welded in the molten state is often generated at the place welded by the electrode rod 700, the degree of incision of the first inner cutout 611 in the direction opposite to the traveling direction of the electrode rod 700 is increased, So that the amount is sprayed.

1, the cutting angle? 2 of the first inner cutout 611 on the opposite side of the proceeding direction of the electrode rod 700 is smaller than the cut angle? 1 of the second inner cutout 613 on the advancing direction side of the electrode rod 700 ). ≪ / RTI > Due to the difference in the angle of incision, the range of injection of the protective gas is different. In Fig. 1, the direction of welding of the electrode rod is from the right to the left.

Since the protective gas is formed into a fan shape by the outer cutout 615 and the inner cutouts 611 and 613 and is sprayed to the periphery of the workpiece and the electrode rod 700, .

The cooling unit 650 may be provided to cool the working electrode 700. The cooling unit 650 may include an inner diameter passage 654, an outer diameter passage 653, and a flow hole 654 And the like.

The inner diameter channel 654 may be connected to the cooling water supply unit 651 and disposed at the upper center of the electrode rod holder 620, that is, at the inner center of the pivot rod 640. The outer diameter passage 653 may be formed between the inner diameter passage 654 and the upper side portion of the electrode rod holder 620, that is, between the outer circumferential surface of the rotating rod 640 and the inner diameter passage 654. The flow hole 654 may be formed on the electrode rod holder 620 so as to be connected between the inner diameter passage 654 and the outer diameter passage 653.

The cooling water supplied from the cooling water supply portion moves from the upper portion to the lower portion through the inner diameter passage 654 and passes from the lower portion to the upper portion via the outer diameter passage 653 through the flow hole 654, (620).

The determination of the cooling water flow is performed by preferentially cooling the electrode rod and the electrode rod mounting portion 621 which are to be heated most and then rotating the peripheral portion of the electrode rod that is slightly less heated than the electrode rod when the cooling water is returned along the outer diameter channel 653, The lower end of the torch frame 610, the outer frame portion of the gas chamber 632, and the like.

The flow of the cooling water as above is preferentially cooled from the electrode rod and the electrode rod holder 621, which are most heated and best cooled, so that the function of the cooling water can be exerted more effectively.

Referring to FIG. 4, there is shown a state in which a rotary type welding apparatus 1200 according to the present invention is installed in a moving device of a welding facility and is supplied with a sparking material 20, and enters a narrow space of the welding target material 10. FIG. Thereafter, the welding operation progresses, and the narrow space of the workpiece to be welded repeatedly reciprocates the electrode rod 700 back and forth a plurality of times so that the welding is performed in a stacked manner. After the welding is completed, the laminated welding shape 13 can be seen as in Fig. In the welded shape 13, the rotating rod 640 is rotated by the driving unit 641, and the electrode rod holder 620 disposed at the lower end of the rotating path rotates within a certain angle range, do.

That is, since the tungsten electrode rod 700 mounted on the mounting portion 621 of the electrode holder 620 can be rotated by ± Φ1 with respect to the vertical axis, the tungsten electrode rod 700 can be moved in accordance with the width of the narrow space of the welding target material 10 Thus, even if the narrow space is formed relatively wide, the welding can be completed without welding.

The above items are only specific examples of the welding apparatus.

Therefore, it should be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims. do.

610: torch frame 611: first inner cutout
613: second inner cutout portion 615: outer cutout portion
620: Electrode holder 621: Electrode mounting part
630: gas jetting part 631: gas flow path
632 gas chamber 633 diffusion filter
640: Rotating rod 641:
650: cooling section 651: cooling water supply section
652: inner diameter channel 653: outer diameter channel
654: Flow hole 700: Electrode
1200: Rotating type welding device

Claims (6)

A device body connected to the moving device of the welding plant;
A driving unit fixed to the apparatus body;
An angle adjusting unit interlocked with the driving unit and rotated at a predetermined angle; And
And a torch part connected to the angle adjusting part and having a welding angle of the electrode rod adjusted according to the movement of the angle adjusting part,
The torch portion
A torch frame connected to the angle adjuster and rotatable at a predetermined angle;
An electrode rod holder disposed at a central portion of the torch frame and coupled to an electrode rod at a lower end portion thereof; And
And a gas injecting part for injecting a protective gas into the periphery of the electrode rod when the electrode rod is operated,
The gas-
A gas flow channel connected to the gas supply unit and formed inside the upper portion of the torch frame;
A gas chamber formed in a lower portion of the torch frame and connected to the gas flow channel; And
And a U-shaped diffusion filter disposed at a lower portion of the gas chamber so that the protective gas is uniformly injected into the periphery of the electrode rod in a fan shape.
The method according to claim 1,
The driving unit includes:
A drive motor having a shaft;
A connection bracket having a coupling portion connected to a lower portion of the apparatus body on one side and a mounting portion on which the driving motor is coupled on the other side and a shaft hole formed on a center side of the mounting portion;
A screw bar connected to the shaft of the drive motor inserted into the shaft hole; And
And saddles disposed on the screw bar and provided to move on the screw bar in accordance with rotation of the shaft,
The saddle is connected to the screw bar in a ball-screw manner and is provided in a Y-shape. A ball support is disposed inside the upper portion of the saddle, and a plurality of rolling balls are disposed in the ball support. Tilting type welding equipment.
3. The method of claim 2,
Wherein the angle-
A support rod connected to a lower portion of the apparatus body;
A first rotary arm fixed to the saddle and at least partially connected to the support rod by a hinge so as to be rotatable at a predetermined angle in accordance with the movement of the saddle; And
A second rotary rocking arm having a U-shaped configuration, one side of which is connected to the first rotary arm by a connection pin and at least a part of which is connected to the support rod by a hinge so as to be rotatable at an angle according to the movement of the first rotary arm Including,
Wherein the torch frame is bolted and connected to the upper and lower ends of one end of the second rotary shafts and is hinged to the center of the second rotary shafts.
The method according to claim 1,
Wherein an outer cutout portion is formed at both sides of the lower portion of the torch frame in which the gas chamber is formed such that an injection range of the protective gas is increased to the peripheral portion of the electrode rod.
The method according to claim 1,
The inner cutout portion is formed on the lower central side of the torch frame in which the gas chamber is formed and the first inner cutout portion on the opposite side of the proceeding direction of the electrode rod is moved in the forward direction of the electrode rod, Is further cut than a second inner cut-out portion in the traveling direction side of the tilting-type welding device.
6. The method according to any one of claims 1 to 5,
The torch portion may further include a cooling portion for cooling the working electrode rod,
An inner diameter channel connected to the cooling water supply unit and disposed at an inner central portion of the electrode rod holder;
An outer diameter channel formed between the inner diameter channel and the inner portion of the electrode rod holder; And
A flow hole connected between the inner diameter passage and the outer diameter passage;
Wherein the cooling water flows through the inner diameter passage and flows out through the outer diameter passage.

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