JP2002273573A - Automatic buildup welder of flange gasket surface - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the automatic buildup welder of a flange gasket surface by which operability is improved, welding defects can be reduced and an changing of a welding condition depending on a welding posture is not required so as to perform buildup repair automatically. SOLUTION: The welder is provided with a substrate 14 arranged inside of a flange 11 or inside a cylindrical member 13 connected to the flange 11, multiple extension/contraction legs 16 which are disposed on the substrate 14 and which can mount the substrate 14 to the flange 11 or to the member 13 by thrusting the inner peripheral surface of the flange 11 or the inner peripheral surface 15 of the cylindrical member 13, an arm member 17 provided at a substrate 14 rotatably around the center shaft of the flange 11, a rotation driving means 18 for rotating the member 17, and a plasma powder buildup welding torch 20 fitted through a torch holding means 19 provided at the member 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flange gasket which is used, for example, when the surface of the gasket of the flange of the heat exchanger is reduced in thickness or corroded, and the overlay welding is performed mechanically without manual operation. The present invention relates to an automatic surface overlay welding apparatus.

[0002]

2. Description of the Related Art For example, in a flange joint portion of a heat exchanger used in a petroleum refining and petrochemical plant, etc., a processing fluid leaks due to corrosion or thinning generated on a surface of a flange at a gasket contact surface. For this reason, an operator repairs the gasket surface which has been corroded or reduced in thickness at the site by manual welding (mainly, covered arc welding).

[0003]

However, the conventional method for repairing the overlay has the following problems to be solved. Since the welding method is manual welding by an operator, workability is inferior and welding defects such as blowholes are liable to occur. Therefore, a high skill is required for the welding operator. In addition, since the coated arc welding method is applied, the welding position (upward, downward or sideways)
Conditions (welding current, welding voltage, welding speed, etc.)
Therefore, it is necessary to appropriately secure the welding skill, and as a result, the welding worker is required to have a high level of skill, and it has been a problem to secure a welding worker with high skill.

The present invention has been made in view of such circumstances, and can improve workability and reduce welding defects.
It is another object of the present invention to provide an automatic overlay welding apparatus for a flange gasket surface capable of automatically performing overlay repair without changing welding conditions according to a welding attitude.

[0005]

According to the present invention, there is provided an automatic overlay welding apparatus for a flange gasket according to the present invention, comprising: a base disposed inside a flange or a cylindrical member connected to the flange; A plurality of telescopic legs which are provided substantially radially and which can be attached to and retractable from the flange or the cylindrical member by extending the inner peripheral surface of the flange or the inner wall surface of the cylindrical member; An arm member rotatably provided around the arm member, rotation driving means for rotating the arm member, and a plasma powder overlay welding torch attached via a torch holding means provided on the arm member. Overlay welding on the gasket surface of the flesh or corroded flange. Thus, by using the plasma powder overlay welding torch, it is not necessary to change welding conditions depending on the welding position, and all welding positions (downward,
Sideways and upward). Further, a lightweight and compact portable device can be obtained.

[0006] In the automatic overlay welding apparatus for a flange gasket surface according to the present invention, the arm member may be configured to be detachably provided on the base. As a result, the weight to be handled is reduced and the size to be handled can be reduced. In the automatic overlay welding apparatus for a flange gasket surface according to the present invention, a torch feeding means for shifting the torch holding means in the radial direction of the flange may be provided. Thereby, it is possible to cope with flanges having different radii and to weave the plasma powder overlay welding torch. In the automatic overlay welding apparatus for a flange gasket surface according to the present invention, the drive source of the torch feed means may be configured to utilize a part of the driving force of the rotary drive means. by this,
The rotation and feed of the plasma powder overlay welding torch can be mechanically synchronized, and the drive source can be omitted.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the accompanying drawings to provide an understanding of the present invention. Here, FIG. 1 is a perspective view of an automatic overlay welding apparatus for a flange gasket surface according to an embodiment of the present invention, FIG. 2 is a front sectional view of the automatic overlay welding apparatus for the flange gasket surface, and FIG. FIG. 4 is an exploded perspective view of a torch feed means of an automatic overlay welding apparatus for a flange gasket surface.
(A) and (B) are front views of a welding body and a base of the automatic cladding welding apparatus for the flange gasket surface, respectively, and FIG. FIG. 6 is an explanatory view of the plasma powder overlay welding method, FIG. 7 is a configuration diagram of equipment used in the plasma powder overlay welding experiment, and FIG. 8 is a welding lamination in the plasma powder overlay welding experiment. FIG. 9 is a graph showing an experimental result of the plasma powder overlay welding.

As shown in FIGS. 1 to 4, an automatic overlay welding apparatus 10 (hereinafter, simply referred to as an automatic overlay welding apparatus) for a flange gasket surface according to an embodiment of the present invention is, for example, a heat exchanger. Gasket contact surface 12 of vessel flange 11
If the body is thinned or corroded, the part must be manually (manually)
Instead, it is used for mechanical (automatic) overlay welding. The automatic overlay welding apparatus 10 includes a base 14 disposed inside a cylindrical member 13 connected to a flange 11 whose central axis coincides with a horizontal line. The base 14 is provided radially and stretches the inner wall surface 15 of the cylindrical member 13.
A strut jack 16 is an example of eight extendable telescopic legs that can be attached to the cylindrical member 13.

An arm member 17 is provided on the base 14 so as to be rotatable about a central axis of the flange 11.
A rotation drive unit 18 for rotating the arm member 17 is provided. The arm member 17 is provided with a plasma powder overlay welding torch 20 via a torch holding means 19,
Torch feeding means 21 for shifting torch holding means 19 in the extending direction of arm member 17 (radial direction of flange 11)
Is provided. Hereinafter, these will be described in detail.

As shown in FIGS. 4A and 4B, the automatic overlay welding apparatus 10 is divided into a base 14 and a welding body 22 detachably formed on the base 14. The automatic overlay welding apparatus 10 is connected to the cylindrical member 1
When mounted on the camera 3, the weight is reduced so as to facilitate handling, and the handling size is reduced.

The welding main body 22 has a rotating shaft 23 detachably formed on the base 14 and an arm member 17 provided rotatably with respect to the rotating shaft 23. Further, the welding main body 22 includes a disk-shaped feed roller thrust plate 24 fixed to the tip of the rotating shaft 23, a rotation driving unit 18 fixed to the feed roller thrust plate 24 to rotate the arm member 17, The torch holding means 19 for holding the build-up welding torch 20 and the plasma powder build-up welding torch 20 are moved in a direction orthogonal to the rotation direction of the arm member 17 (radial direction of the flange 11), and the plasma powder A torch feeding means 21 for weaving the body overlay welding torch 20 is provided.

The rotation driving means 18 meshes with a driving motor 25 provided on one side of the feed roller thrust plate 24, a driving gear 26 provided on an output shaft of the driving motor 25, and the driving gear 26. A driven gear 28 has a fixed outer peripheral portion of a cylindrical connecting member 27 through which the shaft 23 is inserted. Therefore, by driving the drive motor 25, the arm member 17 is rotated by the rotating shaft 2 fixed to the base 14.
3 can be turned. The drive motor 2
Reference numeral 5 indicates that the rotation speed can be controlled by inverter control so that the rotation speed of the plasma powder overlay welding torch 20 can be adjusted according to welding conditions and the like.

As shown in FIG. 1 and FIG.
7 are two plate-like members 29, 3 arranged in parallel with each other.
0 is integrally formed via an outer peripheral portion at an intermediate position of the connecting member 27. The base member 14 is provided with eight strut jacks 16 radially at equal intervals in the circumferential direction in a cross section perpendicular to the rotating shaft 23, and furthermore, in such a manner that the base member 14 can be easily mounted (see FIG. 5). They are arranged in a zigzag pattern with a slight gap between them. As shown in FIG. 2, the tension jack 16 has a tension screw rod 31 and a cylindrical body 32 having a nut member screwed to the tension screw rod 31. The base 14 has a central axis coinciding with the central axis m of the cylindrical member 13, and has a polygonal cross-sectional shape cut along a plane perpendicular to the central axis. A flange-shaped mounting bracket 33 formed at the base end is fastened.

As shown in FIGS. 2 and 4A and 4B, the method of fixing the rotating shaft 23 to the base 14 is as follows.
Is inserted into a hole 14a formed in the base 14, and a screw portion 23b formed to protrude from the base end 23a.
Are screwed together with a nut 23c. Therefore, the rotating shaft 23 can be separated from the base 14 by removing the nut 23c. The central axis of the base 14 (the central axis m of the cylindrical member 13) and the central axis n of the rotating shaft 23 are made to coincide with each other.

As shown in FIG. 1, the arm member 17 includes
At a position opposite to the side where the torch feed means 21 is provided,
A counterweight 34 is mounted via a mounting bracket 34a so as to be balanced with the torch feeding means 21. Thus, when the arm member 17 rotates, the torch feeding means 21 and the counterweight 34 are balanced, so that the rotation speed of the arm member 17 becomes uniform, and as a result, the build-up welding speed becomes uniform. In particular, as shown in the present embodiment, even in the case of horizontal welding in which the flange 11 is provided in a vertical direction, the rotation speed of the arm member 17 becomes uniform, and therefore, welding accuracy is improved.

As shown in FIG. 2, the torch feeding means 21 includes a roller 36 which comes into contact with a plate surface 35 near the peripheral edge of the feed roller thrust plate 24, and an elastic member which urges the roller 36 against the surface of the feed roller thrust plate 24. And a spring 37 as an example. The torch feeding means 21 for shifting the torch holding means 19, as will be described later, uses a part of the rotational force due to the rolling of the roller 36, that is, the rotational force due to the rotation of the arm member 17, to build up the plasma powder. The welding torch 20 is advanced and retracted in the radial direction of the flange 11. As the roller 36, a roller made of a silicon resin or a roller made of metal, hard resin, or the like provided with a silicon resin layer on the outside thereof is used.

As shown in FIG. 3, the torch feed means 21 has a feed base 38 having one end detachably fixed to the plate member 29 of the arm member 17. A cylindrical shaft 41 having one end (base end) attached to the center of the shaft is supported by a spring 37 and a bearing 39 (the front side, the machine side housings 40 and 40a are fastened by bolts). Have been. A spline hole having a predetermined length is formed inside the tip of the cylindrical shaft portion 41.

As shown in FIG. 2 and FIG.
A spline shaft 43 formed at one end of the drive shaft 42 meshes with the spline hole. A spherical shaft portion 44 is formed at the center of the drive shaft 42, and a spherical bearing provided on the feed base 38. 45 (the front and machine-side housings 46 and 46a are fastened by a plurality of bolts 47). The other end of the drive shaft 42 is connected to an input shaft of a speed reducer 49 via a bellows coupling 48.
The speed reducer 49 is screwed to a rectangular mounting plate 49 a provided at the tip of the feed stand 38, and a pulley 50 is mounted on an output shaft of the speed reducer 49.

As shown in FIGS. 2 and 3, the speed reducer 49 includes a rotation direction switching mechanism for switching the rotation direction of the output shaft and a rotation speed control mechanism for controlling the rotation speed of the output shaft. Is switched via a switching lever 51, while the control of the rotational speed is performed by mechanically operating the control lever 52 via an operation mechanism (not shown). Therefore, weaving (reciprocal movement in the direction perpendicular to the rotation direction, that is, reciprocation in the radial direction of the flange 11) can be performed while rotating the plasma powder build-up welding torch 20, and the weaving speed and welding conditions can be adjusted. It can be adjusted according to.

As shown in FIGS. 2 and 3, bearings 53 and 54 are formed at both ends of the feed table 38, and a screw shaft 55 is rotatably supported by the bearings 53 and 54. At the shaft end of the screw shaft 55 on the bearing portion 54 side,
A pulley 56 is attached, and pulleys 50 and 56 are attached.
A timing belt 57 is stretched between them. Therefore, the rotation of the roller 36 can be transmitted to the screw shaft 55 via the speed reducer 49, and the rotation direction and the rotation speed of the screw shaft 55 can be changed by the switching lever 51 and the control lever 52 of the speed reducer 49. it can.

As shown in FIG. 3, the screw shaft 55 is provided with a torch mounting base 58 having a nut portion formed with a female screw to be screwed with a male screw of the screw shaft 55. A feed guide 38 is provided with a groove-shaped guide 5 having a concave cross section and provided on the rear surface of the torch mount 58 at a parallel interval.
Convex guides 61 and 62 through which the guides 9 and 60 are guided, respectively.
It has. The plasma powder overlay welding torch 20 is mounted on the torch mounting base 58 via a mounting bracket 63. Adjustment of the distance between the tip of the plasma powder overlay welding torch 20 and the surface of the flange 11 is performed by adjusting the torch mount 58.
The rotation can be performed by rotating the knob 58a attached to the camera.

The arm member 17 and the feed base 38 can be replaced with appropriate ones according to the size (diameter) of the gasket contact surface 12 of the flange 11 to be built up. For example, by replacing or combining the drive shaft 42 and the feed base 38 of various sizes,
It is possible to cope with overlay welding of flanges 11 having different diameters. As shown in FIG. 4, the automatic overlay welding apparatus 10 can be largely divided into a welding main body 22 and a base 14, but the welding main body 22 further includes a rotating shaft 23, a feed roller thrust plate 24, an arm member 17, and a torch feed. It can be divided into the means 21, the feeder 38 and the like.

As described in the present embodiment, when the base 14 is mounted on the cylindrical member 13 to which the flange 11 provided in the vertical plane is connected, for example, as shown in FIG. A base mounting jig 65 that can be hung on a hook 64 of a heavy machine is used. The base mounting jig 65 includes an attaching / detaching portion 66 to which one end side (arm member 17 side) of the base 14 can be attached / detached, a beam member 67 having the attaching / detaching portion 66 attached to one end portion, and an upper portion of the beam member 67. A hanging wire 70 is provided via mounting brackets 68 and 69 attached at predetermined intervals, and a counterweight 71 is provided at the other end of the beam member 67. By using the jig 65 for mounting the base, the cylindrical member 13 arranged in the horizontal direction is used.
The base 14 can be easily centered on the
Can be easily mounted on the cylindrical member 13.

Referring to FIG. 6, a plasma powder overlay welding (PTA) method using plasma powder overlay welding torch 20 will be conceptually described. The plasma powder build-up welding method is a welding method in which powder (weld metal) 72 is discharged into a plasma arc 73 and melted, and this is sprayed on a base material 74 to form a weld metal 75, and build-up welding is performed. In FIG. 6, reference numeral 76 indicates an electrode, reference numeral 77 indicates a plasma gas, and reference numeral 78 indicates a shielding gas. The plasma powder overlay welding apparatus that operates the plasma powder overlay welding torch 20 includes a plasma welding power source, a powder feeder, and a cooling water circulator.

Compared with other welding methods, the plasma powder overlay welding method has less dilution of the base metal 74 (change in base metal component due to penetration of the molten weld metal 75) and a wider bead width. Because of its low extra height, it is widely used mainly for overlay welding of metal materials in which welding materials are difficult to form into rods (wires). Furthermore, since the heat input is low as compared with other welding methods, there is an advantage that when the overlay welding is performed on the flange gasket surface as in the present invention, welding distortion after welding is hardly generated.

Next, a method of using an automatic overlay welding apparatus for a flange gasket surface according to an embodiment of the present invention will be described with reference to the drawings. (1) As shown in FIG. 5, a base member 14 is lifted by a hoist using a base mounting jig 65, a flange 11 for overlay welding is connected, and a cylindrical member having a central axis m arranged horizontally. The substrate 14 is inserted into the substrate 13. (2) After positioning the base 14 in the cylindrical member 13 in the horizontal direction, the eight strut jacks 16 provided on the base 14 are operated, and each of the strut jacks 16 is operated.
Is stretched radially by a predetermined stroke, and the inner wall surface 15 of the cylindrical member 13 is stretched.
4 is mounted on the cylindrical member 13. Thereby, the base 1
4 and the center line m of the cylindrical member 13 coincide with each other.

(3) The welding body 22 is lifted by a hoist,
As shown in FIG. 4, a base 14 a of the rotating shaft 23 is inserted into a hole 14 a formed in the base 14 mounted in the cylindrical member 13.
And a screw portion 2 formed to protrude from the base end portion 23a.
3b is screwed with a nut 23c to connect the welding body 22 to the base 14
Fixed to. Thereby, the center line of the base 14 and the rotation axis 2
3 will be coincident, so that the axis of rotation 2
The center line n of 3 and the center line of the flange 11 coincide. (4) According to the size of the flange 11, the rotation speed of the plasma powder overlay welding torch 20 is set by inverter control, and the plasma powder overlay welding torch 20 is set.
The radial movement (weaving) range and movement speed of the flange 11 are set. The distance between the tip of the plasma powder overlay welding torch 20 and the gasket contact surface 12 of the flange 11 is set by rotating a knob 58 a provided on the torch mount 58.

(5) After the above setting is completed, when the drive motor 25 is driven to rotate the arm member 17, the plasma powder overlay welding torch 20 rotates with respect to the flange 11 and performs weaving. I do. (6) The plasma powder overlay welding apparatus is operated to spray a welding metal 75 from the plasma powder overlay welding torch 20,
Overlay welding is performed on the surface 12 of the gasket that has been thinned or corroded.

[0029]

FIG. 7 shows the configuration of equipment used in an experiment of the plasma powder overlay welding method. A plasma powder overlay welding torch 20 is provided at the tip of a torch mount 80 with a weaving mechanism, which is attached to the tip of a positioner 79 and rotatably mounted in a vertical plane in the direction indicated by the arrow in the figure. ing. By driving the positioner 79, the plasma powder overlay welding torch 20 is rectangular (500 mm × 500 mm).
mm) of a test material (corresponding to the flange 11) 82 of a test material (corresponding to the flange 11). Note that reference numeral 83 in FIG. 7 denotes a cylinder filled with argon gas (100%) used as a shielding gas,
Reference numeral 84 denotes a power supply, and reference numeral 85 denotes a control device.

Generally, carbon steel, low alloy steel, austenitic stainless steel, and the like are often used as the material of the flange 11. In this experiment, the test material 82 was used to confirm the workability of welding. A typical austenitic stainless steel (SUS304) and a carbon steel sheet for welded structure (SM400) were used. Table 1 shows the chemical components of the powder 72 used in the experiment. In Table 1, “P-308L” indicates the powder for SUS304 and “P-308L”.
“MS” represents a powder for SM400.

[0031]

[Table 1]

As an experimental method, as shown in FIG. 7, when the test material 82 is in the horizontal direction, "upward", "downward" and "horizontal" welding postures are required. Nevertheless, the optimum welding conditions that can be welded with only one type of welding condition were determined in this experiment. For this reason, the plasma powder overlay welding torch 20 was rotated and the welding current, welding voltage, and shield gas were changed to find the most stable all-round welding conditions (optimal welding conditions). At this time, as shown in FIG. 8, the welding method was a one-layer, four-pass finish, and welding was performed spirally from the outer periphery to the inner periphery. In addition, about the test material 82 which performed the welding experiment, the visual inspection, the macro test, and the hardness test were performed, and the soundness of the welding part was verified. Table 2 shows the optimum overlay welding conditions determined by experiments.

[0033]

[Table 2]

With respect to the test material 82 (SUS304 and SM400) performed under the optimum overlay welding conditions, the appearance of the weld bead and the cross-sectional macro were observed. As a result, the bead surfaces of all the test materials were smooth, and the penetration depth was good. As shown in FIG.
SUS304 (shown in (b) and (c) in the figure) and SM400 ((d) in the figure) at measurement positions A and B shown in FIG.
In the hardness test results near the weld bead (shown in (e)) and the heat-affected zone, none of these hardness values was much different from the hardness value in normal arc welding. Judging from the above, it became clear that the plasma powder overlay welding method can be applied to the overlay welding of the flange gasket surface.

In the above embodiment, the torch feeding means 21 for moving the plasma powder overlay welding torch 20 in the radial direction of the flange 11 is provided, but the present invention is not limited to this.
If necessary, the torch feeding means 21 can be omitted. The direction (welding position) of the plasma powder overlay welding torch 20 is horizontal, that is, the surface of the flange 11 is vertical, but the present invention is not limited to this, and the direction of the plasma powder overlay welding torch 20 is upward and downward. That is, the surface of the flange 11 may be in the horizontal direction. Although the center line of the base 14 is configured to coincide with the center line of the flange 11, the center line of the base 14 may be shifted from the center line of the flange 11 depending on the welding situation. Also,
A strut jack 16 is radially provided on the base 14,
The present invention is not limited to this. If the base member 14 can be mounted on the inner wall surface of the cylindrical member by the expansion and contraction of the strut jack 16, it does not have to be provided radially. The strut jack 16 stretches the inner wall surface 15 of the cylindrical member 13 to attach the base 14 to the cylindrical member 13. However, the strut jack 16 may be configured to abut the inner peripheral surface of the flange 11 according to the situation. Can also.

Although eight strut jacks 16 are provided on the base 14, the invention is not limited to this, and three to seven or nine or more can be provided depending on the situation. In the torch feeding means 21 for moving the plasma powder overlay welding torch 20 in the radial direction of the flange 11, the reduction gear 49 is driven by using the rotation of the roller 36 due to the rotation of the arm member 17, but this configuration is used. However, the speed reducer 49 can be directly driven by another electric motor. In this case, the rotation direction of the screw shaft 55 can be changed and the rotation speed can be controlled by changing the rotation direction and the rotation speed of the electric motor. Therefore, roller 3
6, the spring 37, the bearing 39, the cylindrical shaft portion 41, the drive shaft 42, the spherical bearing 45, and the bellows coupling 48 become unnecessary. Further, although the torch mounting base 58 is moved via the screw shaft 55, the invention is not limited to this, and the torch mounting base can be moved forward and backward by another method. Although the automatic overlay welding apparatus 10 is configured to be divided into two parts, the base 14 and the welding main body 22, the present invention is not limited to this, and may be an integral structure.

[0037]

In the automatic overlay welding apparatus for flange gasket surfaces according to the first to fourth aspects, the use of a plasma powder overlay welding torch does not require any change in welding conditions depending on the welding position, and all of the above. Can be applied in any of the following welding positions (downward, lateral, and upward), so that a welder who does not have advanced skills can easily perform overlay welding on site. Also,
Since a lightweight and compact portable device can be provided, repair welding can be easily performed by bringing the device into plant equipment. In particular, in the automatic overlay welding apparatus for a flange gasket surface according to the second aspect, the handling weight is reduced and the handling size can be reduced, so that the handling property is improved. In the automatic welding apparatus for a flange gasket surface according to the third aspect, since it is possible to cope with the difference in the radius of the flange and to weave the plasma powder overlay welding torch, it can be applied to flanges of various sizes. In addition, the welding operation can be improved. In the automatic overlay welding apparatus for a flange gasket according to the fourth aspect, the rotation and the feed (weaving) of the plasma powder overlay welding torch can be mechanically synchronized, and at the same time, the drive source can be omitted. And the configuration of the device can be simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view of an automatic overlay welding apparatus for a flange gasket surface according to an embodiment of the present invention.

FIG. 2 is a front sectional view of the automatic overlay welding apparatus for the flange gasket surface.

FIG. 3 is an exploded perspective view of a torch feeding means of the automatic overlay welding apparatus for the flange gasket surface.

FIGS. 4A and 4B are front views of a welding body and a base body of the automatic overlay welding apparatus for the flange gasket surface, respectively.

FIG. 5 is an explanatory view of mounting a base of the automatic overlay welding apparatus on the flange gasket surface to the flange.

FIG. 6 is an explanatory diagram of a plasma powder overlay welding method.

FIG. 7 is a configuration diagram of equipment used in an experiment of plasma powder overlay welding.

FIG. 8 is an explanatory diagram of a welding lamination method in the plasma powder overlay welding experiment.

FIG. 9 is a graph showing experimental results of the plasma powder overlay welding.

[Explanation of symbols]

10: Automatic welding equipment for flange gasket surface, 1
1: flange, 12: gasket contact surface, 13: cylindrical member, 14: base, 14a: hole, 15: inner wall surface, 1
6: Stretch jack (extendable leg), 17: Arm member,
18: rotation driving means, 19: torch holding means, 20: plasma powder overlay welding torch, 21: torch feeding means, 2
2: welding body, 23: rotating shaft, 23a: base end, 23
b: screw portion, 23c: nut, 24: feed roller thrust plate, 25: drive motor, 26: drive gear, 27: connecting member, 28: driven gear, 29, 30: plate member, 3
1: Strut screw rod, 32: cylindrical body, 33: mounting bracket,
34: counterweight, 34a: mounting bracket, 3
5: plate surface, 36: roller, 37: spring (elastic member), 38: feed stand, 39: bearing, 40: front housing, 40a: machine housing, 41: cylindrical shaft, 42:
Drive shaft, 43: spline shaft, 44: spherical shaft portion, 45:
Spherical bearing, 46: front housing, 46a: machine housing, 47: bolt, 48: bellows coupling, 4
9: reducer, 49a: mounting plate, 50: pulley, 5
1: switch lever, 52: control lever, 53, 54: bearing, 55: screw shaft, 56: pulley, 57: timing belt, 58: torch mount, 58a: knob, 59, 60: groove guide, 61 , 62: Guide, 6
3: mounting bracket, 64: hook, 65: jig for mounting the substrate, 66: detachable part, 67: beam members 67, 68, 69:
Mounting bracket, 70: hanging wire, 71: counterweight, 72: powder (weld metal), 73: plasma arc, 74: base metal, 75: weld metal, 76: electrode, 77:
Plasma gas, 78: shielding gas, 79: positioner, 80: torch mount, 81: overlay weld, 82:
Test material, 83: cylinder, 84: power supply, 85: control device

Claims (4)

[Claims] 1. A base disposed inside a flange or a cylindrical member connected to the flange, and a base provided substantially radially on the base, and further provided on an inner peripheral surface of the flange or the cylindrical member. A plurality of extendable legs that can be attached to the flange or the cylindrical member and stretchable by stretching the inner wall surface, and an arm member provided on the base so as to be rotatable around a central axis of the flange; A rotating drive means for rotating the arm member, and a plasma powder build-up welding torch attached via a torch holding means provided on the arm member, wherein the gasket surface of the reduced or corroded flange is built-up. Automatic build-up welding equipment for flange gasket surface characterized by welding. 2. An automatic overlay welding apparatus for a flange gasket according to claim 1, wherein said arm member is detachably provided on said base. 3. A flange gasket surface according to claim 1, further comprising a torch feed means for shifting said torch holding means in a radial direction of said flange. Automatic overlay welding equipment. 4. A flange gasket surface automatic welding apparatus according to claim 3, wherein a drive source of said torch feed means uses a part of a driving force of said rotary drive means. Automatic overlay welding equipment.