KR20110021155A - Welding device and method for stainless steel with high current tig welding - Google Patents

Abstract

PURPOSE: A welding machine of stainless steel using high-current TIG welding and a method thereof are provided to enable the formation of a sound back bead, since a key hole is welded by a fist TIG torch and is finished by a second TIG torch. CONSTITUTION: A welding machine of stainless steel using high-current TIG welding comprises a jig table(100), a first TIG torch(110), and a second TIG torch(120). The first TIG torch passes by a welded junction of stainless steel on the jig table. The first TIG torch enables key hole type TIG welding. The second TIG torch enables thermal conductive welding for finishing welding.

Description

Welding device and method of stainless steel using high current TIG {WELDING DEVICE AND METHOD FOR STAINLESS STEEL WITH HIGH CURRENT TIG WELDING}

The present invention relates to an apparatus and method for welding stainless steel using a high current tag, and more particularly, to a stainless steel welding device using a high current tag, which is capable of forming a healthy backside bead without melting by using two first and second tag torches. It relates to a welding apparatus and method of stainless steel using.

Plate butt welding of stainless steel can be applied with various welding techniques depending on the thickness. In particular, in the butt welding of 5 to 20 mm ^t thickness, laser beam welding, plasma arc welding, submerged arc welding, and MAG welding are commonly used welding techniques.

However, in the butt welding of stainless steel according to these welding methods, there are respective problems as described below.

That is, first of all, the submerged arc welding is generally applied to carbon steel welding by fixing the backing material (ceramic backing material, copper sugar, etc.) that can support the molten pool to the one side to weld the one side welding. Although it is a technique, it is not yet applied to stainless steel welding. Therefore, it is common to apply the butt welding method to the butt welding of stainless steel. For two-sided welding, a method of welding one side with a proper welding condition according to the thickness, and welding another side by inverting a flat plate. This welding method is also commonly used in carbon steel welding, but in stainless steel welding, when the plate is flipped to weld the other side after welding one side, the member is damaged by friction between the platen and the member, and the member is damaged by the clamp marks. As a result, the risk of an accident that the member deviates from the clamp due to the softness of the stainless steel itself is always inherent.

In addition, MAG (Metal Active Gas) welding is low in thermal efficiency, and in order to weld a plate butt, the welding seam is generally welded by V or U improvement.

This welding method is small in welding efficiency, and welding is required 5 times with a 45 degree degree of improvement angle, in order to weld 16 mm ^t thickness. V-improved multi-layer welding has a wider range of improvements as the thickness increases, so weaving or dividing techniques are used during welding. This is a barrier to automatic gantry welding, and multilayer welding has a problem of poor fusion and poor mixing of slugs. Therefore, double-sided welding mainly using submerged arc is generally used.

In addition, in the technique used in electron beam welding, laser beam welding, and plasma arc welding used in keyhole type welding, if the welding joint is mounted before the plate butt welding of stainless steel, the gap is inevitable depending on the degree of machining of the improved surface and the straightness of the plate. This gap has a problem of causing a welding defect called melt depending on the degree of the same current and the same welding speed in the keyhole welding.

The present invention has been invented to solve the above problems, the object of which is to penetrate by the length of the improvement surface preceding the first tig torch of the keyhole type welding in the plate butt welding of stainless steel, and then to the heat conduction welding Welding apparatus of stainless steel using high current TIG which can form a healthy backside bead without melting by finishing welding with the second TIG torch of plasma arc welding, MAG welding, submerged welding, and To provide a way.

In order to achieve the above object, according to the present invention, the first jig torch of the welding jig table and the keyhole type TIG welding for welding through the length of the welding joint of the stainless steel mounted on the jig table in advance, Provided is a welding apparatus for stainless steel using a high current tag that includes a second tag torch of thermally conductive welding that follows the preceding of the first tag torch and finishes the welding.

In addition, the second TIG torch may be used for TIG welding, plasma arc welding, MAG welding, and submerged welding of thermal conductive welding.

In addition, the first tag torch and the second tag torch may include a control unit for controlling the welding current and the speed, respectively, according to the gap information of the gap in the welded joint, the gap between the gap is installed in the weld joint The information acquisition device may be further included to acquire a signal and send a signal to the controller.

In addition, the first tag torch and the second tag torch are preceded by the first tag torch through a gantry installed on the jig table, and the second tag torch is followed by the first or the first tag torch is mounted on the bogie. It can be preceded and followed by a second tag torch.

In addition, the cooling and backside shielding jig, which is installed on the lower surface of the jig table to prevent the oxidation film and the thermal deformation of the back side of the weld, and the lifting and lowering means for moving the cooling and backside shielding jig up and down from the jig table. And horizontally moving means for horizontally moving the cooling and backside shielding jig along the welded joint.

The cooling and backside shielding jig includes a groove formed at the center facing the welded joint, a gas passage formed to supply a protective gas to prevent oxidation of the welded backed portion toward the groove, and a thermal deformation of the welded joint. It may be formed to one side so that the cooling water inflow passage in which the cooling water is introduced, and the cooling water discharge passage is connected to the cooling water inlet passage in communication with the cooling water introduced.

The elevating means is provided with a pair of screw shafts installed through the through-holes of which threads are formed in the cooling and the rear shielding jig and the upper end of which is located on the jig table, and connected to the pair of screw shafts to raise and lower the cooling and rear shielding jig. It may include a drive motor to assist the movement, the horizontal movement means, the guide rail is formed in the longitudinal direction on the lower surface of the jig table, and is installed on the lower surface of the jig table so that the cooling and back shielding jig is horizontally moved along the guide rail Can include a helping cylinder.

Further, according to the present invention, through-welding of the first TIG torch of the keyhole type TIG welding by the length of the welded joint of the stainless steel is carried out, and after the preceding of the first TIG torch, the second TIG torch of the thermal conductive welding is followed. Provided is a method for welding stainless steel using high current tags for finishing welding.

According to the welding apparatus and method of the stainless steel using the high current tag of the present invention, both sides are welded by welding the keyhole with the first tig torch, which is preceded by the flat butt welding of stainless steel, and finishing the welding with the second tig torch, which is followed by thermal conductive welding. It has the effect of forming a healthy backside bead without melting without performing welding or repeated welding.

Hereinafter, one embodiment of the present invention will be described in more detail with reference to the accompanying drawings so that those skilled in the art can easily practice, but this is only an example, the present invention is limited thereto. It doesn't happen.

1 is a block diagram of a welding apparatus for stainless steel using a high current tag according to an embodiment of the present invention, Figure 2 is a jig table and cooling and backside shielding jig in a welding apparatus for stainless steel using a high current tag according to an embodiment of the present invention 3 is a view illustrating a welding state made of a first tag torch and a welding state made of a second tag torch in the welding method of stainless steel using a high current tag according to an embodiment of the present invention.

As shown in FIG. 1, the welding apparatus of stainless steel using the high-current tag of this embodiment is a welding joint part of the welding jig table 100 and the welding member 10 put on the jig table 100 (FIG. 3). A first tag torch 110 for welding prior to 12 and a second tag torch 120 for finishing welding while trailing after the first of the first torch 110 may be included. Cooling and backside shielding jig 160 for protecting the part 12, elevating means for moving up and down the cooling and backside shielding jig 160, and cooling and backside shielding jig 160 weld seam 12 It may further include a horizontal movement means for moving horizontally along.

Here, the welding jig table 100 is supported on the bottom surface as the leg portion 102, and the flat portion 104 is provided on the leg portion 102 to have a flat and constant area, so that welding is required. The steel member 10 may be located.

The first TIG torch 110 which penetrates and welds the welding joint 12 of the stainless steel member 10 mounted on the jig table 100 by a length may use keyhole type TIG welding. The second TIG torch 120 which finishes the welding with the following trailing after the preceding of the first TIG torch 110 may be a TIG welding, a plasma arc welding, a MAG welding, a submerged welding, or the like of thermal conductive welding.

The first tag torch 110 and the second tag torch 120 are preceded by the first tag torch 110 through a gantry 140 installed in the jig table 100, and the second tag torch ( 120 may be followed.

The gantry 140 is a structure formed by lowering the support 144 to both sides of the horizontal beam 142 to form a leg. The first tag torch 110 is horizontally moved along the horizontal beam 142 in advance, followed by The second tag torch 120 may be laterally moved horizontally.

Although not shown, the horizontal beam 142 may include a driving device such as a motor for moving the first and second tag torch 110 and 120.

In addition, although not shown, the first tag torch 110 and the second tag torch 120 may be horizontally moved by being mounted on a movable trolley.

In addition, the first tag torch 110 and the second tag torch 120 may be further provided in pairs to perform simultaneous welding.

In addition, a first welder 112 may be connected to the first TIG torch 110, and a second welder 122 may be installed to the second TIG torch 120, and a gap of the gap is formed at the weld joint 12. The controller 130 may control the speeds according to the information. The control unit 130 may be connected to the first welding machine 112 and the second welding machine 122 to control the welding current.

In addition, the information acquisition device 150 is connected to the gantry 140 so as to be close to the welding joint part 12 to acquire the gap information of the gap and send a signal to the controller 130.

The information acquisition device 150 may be a laser vision or a camera.

In addition, the cooling and backside shielding jig 160 installed to prevent the oxide film of the backside weld portion and to prevent thermal deformation during the stainless steel welding to protect the weld joint 12 may have a rectangular plate shape and has a bottom surface of the jig table 100. It can be installed to be able to move up and down and horizontal movement.

As shown in FIG. 2, the cooling and backside shielding jig 160 has a bottom portion closed at a predetermined area in the center of the welding joint portion 12 and an open groove portion 161 formed at an upper surface thereof, and toward the groove portion 161. A plurality of gas passages 162 are formed on both sides of the groove 161 in the orthogonal direction to supply a protective gas to prevent the oxide film from being prevented from being welded, and one side of the cooling water 12 prevents thermal deformation of the weld joint 12. The cooling water inflow passage 163 through which the inflow is formed may be penetrated, and may be connected to communicate with the cooling water inflow passage 163 to include a cooling water discharge passage 164 forming a passage to discharge the introduced cooling water.

The gas flowing into the gas passage 162 may be argon or nitrogen gas. The cooling water inflow passage 163 may be configured to introduce cooling water from a cooling water supply device (not shown) installed outside, and the cooling water discharge passage 164. The coolant inlet passage 163 may be formed side by side spaced apart a predetermined distance.

In addition, the lifting means for moving the cooling and the back shielding jig 160 up and down from the jig table 100 is a pair of through holes 165 spaced apart in the longitudinal direction of the cooling and the back shielding jig 160 to form a thread inwardly. ) Is formed through the through hole 165, the screw shaft 170 is installed on the lower surface of the jig table 100, the upper end is installed, the lower end of each screw shaft 170 is connected to the screw shaft And include a driving motor 172 to assist the cooling and the back and down movement of the shielding jig 160.

In addition, the horizontal movement means for horizontally moving the cooling and the backside shielding jig 160 along the weld joint, the guide rail 106 is formed in the longitudinal direction on the lower surface of the jig table 100, the guide rail 106 is a screw An upper end of the shaft 170 may be located. And it may include a cylinder 180 is installed on the lower surface of the jig table 100 to help the cooling and back shielding jig 160 to move horizontally along the guide rail 106.

The cylinder 180 may be installed at both sides with the cooling and rear shielding jig 160 interposed therebetween.

The welding method of stainless steel using the high current tag made of such a structure is performed as follows.

Here, the first tag torch 110 and the second tag torch 120 are installed in the gantry 140 as shown in FIG. 1 and described with reference to an example of moving forward and backward, first, the first tag torch 110 ) And the second tag torch 120 is moved to one side of the gantry 140, and the stainless steel member 10, which is required to be welded, is placed on the jig table 100.

In addition, the cooling and backside shielding jig 160 descending downwards rotates the screw shaft 170 engaged by the driving of the driving motor 172 and rotates the screw shaft 170 rotated inside the through hole 165. Accordingly, the cooling and backside shielding jig 160 is lifted and placed in close contact with the bottom surface of the jig table 100.

Next, the first TIG torch 110 having the welding speed set by the control of the controller 130 is first followed by the welding joint 12, and the keyhole-type TIG welding method is performed by the length of the welding joint 12. Through welding as follows, and then the second TIG torch 120 is followed by the first TIG torch 110 to finish the weld by a thermally conductive welding method.

At this time, the information acquisition device 150 sends a signal to the control unit 130 by measuring the gap of the gap of the welded joint 12, the control unit 130 according to the first and second welding machine 112 ( By controlling 122, the welding current of the first tag torch 110 and the second tag torch 120 is controlled and the welding speed is controlled.

In addition, in the stainless steel welding, since an oxide film and a heat deformation may be generated in the back welding part, this may lead to a welding failure, and thus, it may be prevented through cooling and the back shielding jig 160 which is horizontally moved from the back of the welding part.

The cooling and backside shielding jig 160, which is in close contact with the bottom surface of the jig table 100, has a screw joint 170 positioned in the guide rail 106 by the operation of the cylinder 180 in the horizontal direction. It can be moved along, in the opposite direction can be moved by the opposite cylinder 180, the cylinder 180 is also the first tag torch 110 and the second tag by the control of the control unit 130 It may be synchronized with the torch 120.

The argon or nitrogen gas is introduced into the gas passage 162 to the cooling and the backside shielding jig 160 to prevent the oxide film, and the argon or the nitrogen gas is dispersed to prevent the oxide film from the back side of the welding part. do.

In addition, the cooling water is introduced through the cooling water inflow passage 163 of the cooling jig and the rear surface shielding jig 160, and the rear surface of the welding part may be cooled to prevent thermal deformation through the process of being discharged to the cooling water discharge passage 164.

When the welding is completed as described above, the cooling and back shielding jig 160 is lowered again, butt off the completed welding member 10 and put the new member 10, the above operation is repeated to perform the welding is made. do.

Therefore, according to the above, in the flat butt welding of stainless steel, the first teag torch 110 of the keyhole welding method is passed through the length of the ridge line, and the second teag torch 120 of the thermal conductive welding method is followed by welding. By finishing this, it is possible to form a healthy backside bead without melting without performing double-side welding or repeated welding.

As described above as a specific embodiment of the welding apparatus and method of stainless steel using a high current tag according to the present invention, but this is only an example, the present invention is not limited to this, the broadest range according to the basic idea disclosed herein It should be interpreted as having. Those skilled in the art can easily change the material, size, and the like of each component according to the application field, and can be combined to replace the disclosed embodiments to implement a pattern of a timeless shape, but this is also within the scope of the present invention Will not. It will be apparent to those skilled in the art that various changes and modifications may be readily made without departing from the spirit and scope of the invention as defined by the appended claims.

1 is a block diagram of a welding device for stainless steel using a high current tag according to an embodiment of the present invention,

2 is a perspective view of a jig table and a cooling and backside shielding jig in a welding apparatus for stainless steel using a high current tag according to an embodiment of the present invention;

3 is a view illustrating a welding state made of a first tag torch and a welding state made of a second tag torch in the welding method of stainless steel using a high current tag according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

10: member 12: welded joint

100: jig table 102: leg portion

104: flat portion 106: guide rail

110, 120: 1st, 2nd Tig Torch 112, 122: 1st, 2nd Welder

130: control unit 140: gantry

150: information acquisition device 160: cooling and backside shielding jig

161: groove 162: gas passage

163: cooling water inlet passage 164: cooling water discharge passage

165 through hole 170 screw shaft

172: drive motor 180: cylinder

Claims (13)

Welding jig table, A first TIG torch of keyhole type TIG welding for penetrating and welding the length of the welding seam of the stainless steel mounted on the jig table in advance; A second tag torch of thermally conductive welding that follows the preceding of the first tag torch and finishes the welding. Welding device of stainless steel using a high-current tag comprising a. The method of claim 1, The second tag torch, The welding apparatus of stainless steel using the high-current tag which the TIG welding, the plasma arc welding, the MAG welding, the submerged welding of the heat conductive welding are used. The method of claim 1, The first tag torch and the second tag torch, Welding device of a stainless steel using a high current tag including a control unit for controlling the welding current and the speed in accordance with the gap information of the gap in the welding joint. The method of claim 3, wherein The apparatus for welding stainless steel using a high current tag further includes an information acquiring device, which is installed near the welding joint and acquires gaped information and sends a signal to the controller. The method of claim 1, The first tag torch and the second tag torch are welded to the stainless steel using a high current tag that is preceded by the first tag torch through a gantry installed on the jig table and the second tag torch is followed. Device. The method of claim 1, And the first tag torch and the second tag torch are mounted on a trolley, wherein the first tag torch is preceded and the second tag torch is followed by the welding device for stainless steel using the high current tag. The method of claim 1, Cooling and backside shielding jig which is installed to the lower surface of the jig table to prevent the oxide film and the thermal deformation of the welded back portion to protect the welded joint, Elevating means for moving the cooling and backside shielding jig up and down from the jig table; The welding apparatus of the stainless steel using the high-current tag further comprises a horizontal movement means for horizontally moving the cooling and the back shielding jig along the welding joint. The method of claim 7, wherein The cooling and backside shielding jig, A groove formed at the center to face the welded joint; A gas passage formed to supply a protective gas to prevent the oxide film from being prevented from being welded to the groove side; A coolant inflow passage formed on one side to prevent thermal deformation of the welded joint and in which coolant is introduced; The cooling water discharge passage is connected to the cooling water inlet passage to discharge the cooling water introduced therein Welding device of stainless steel using a high-current tag comprising a. The method of claim 7, wherein The lifting means, A pair of screw shafts installed through the through-holes of which threads are formed in the cooling and backside shielding jig and having an upper end positioned in the jig table; And a driving motor connected to the pair of screw shafts to assist the lifting and lowering of the cooling and backside shielding jig. The method of claim 7, wherein The horizontal moving means, A guide rail formed in a longitudinal direction on a lower surface of the jig table, And a cylinder installed on a lower surface of the jig table to help move the cooling and rear shielding jig along the guide rail. Through-weld by preceding the first TIG torch of keyhole type TIG welding by the length of the welded joint of stainless steel, A method of welding stainless steel using a high current tag for finishing welding by trailing a second tag torch of thermally conductive welding after preceding the first tag torch. The method of claim 11, The method of welding the stainless steel using a high-current tag is used as the heat conduction welding, TIG welding, plasma arc welding, MAG welding, submerged welding. The method of claim 11, The first tag torch and the second tag torch, welding method of stainless steel using a high current tag is controlled by the welding current and the speed through the control unit in accordance with the gap information of the gap in the welding joint.

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