JPH0619976U - Welding shield casing - Google Patents

Abstract

(57) [Summary] [Purpose] In the TIG welding, the periphery of the weld is shut off from the atmosphere to obtain efficient and good welding results. [Structure] A shield casing 1 is configured by an installation ring 2 and a transparent synthetic resin casing body 3 rotatably provided on the installation ring 2, and the casing body 3 includes:
The opening 3a is formed at the bottom, and the glove holes 3e, 3e into which the welding torch 7 and the welding rod 8 are inserted and the shield gas introducing pipe 4 are provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a casing that shields the periphery of a weld from the atmosphere during shield gas welding.

[0002]

[Prior art]

 In TIG welding using argon or the like as the shield gas, when welding stainless steel or the like, the shield gas is spouted from the nozzle of the welding torch only at the tungsten electrode and the molten pool, and the welding is performed immediately after welding. The surface is exposed to the atmosphere while being heated from 500 ° C to 1,000 ° C.

However, for example, when welding an active metal such as titanium or zirconia, the active metal in a high temperature state is very likely to be oxidized, which causes problems such as deterioration of mechanical properties and deterioration of corrosion resistance. Therefore, it is necessary to shut off the air from the atmosphere until the area around the weld is cooled to about 300 ° C.

Therefore, a metal box-shaped cover for covering the welding bead and the heat-affected zone around the welding bead is fixedly installed in the holder of the welding torch, and a shield gas blow-out pipe is arranged in the box-shaped cover. There is a shield jig that blows a shield gas around the weld to shut it off from the atmosphere and cool it.

Further, a stationary chamber provided with a shield gas introducing pipe is provided with a glove hole into which a welding torch and a welding rod are inserted and a transparent portion for visually recognizing the inside, and an object to be welded is put in the chamber. Some welding operations are performed in a shield gas atmosphere.

[0006]

[Problems to be solved by the device]

 However, in the above-mentioned shield jig, the cover is made of metal in consideration of the heat effect and is heavy, and since it is fixed to the welding torch, the edge of the cover is caught on the work to be welded, etc. Cannot be moved smoothly and welding defects such as burn-through will occur. Furthermore, the gap between the edge of the cover and the surface of the work piece changes in conjunction with the vertical movement of the welding torch, which reduces the shielding effect and causes local oxidation defects.

Further, what is welded in the chamber has a good shielding property, so that it is possible to weld an object to be welded having a complicated shape, but the inner volume of the chamber is small and it is a stationary type. However, the work content is limited.

Therefore, an object of the present invention is to provide a shield casing for welding, which has a good shield property and is capable of performing a welding operation on a large workpiece or a workpiece having a complicated shape.

[0009]

[Means for Solving the Problems]

 To achieve the above object, the present invention comprises an installation ring and a casing body rotatably mounted on the installation ring, the casing body having an opening at the bottom, a welding torch and a welding rod. It is characterized in that it has a glove hole for inserting the inside, a transparent part for visually recognizing the inside, and a shield gas introducing pipe.

[0010]

[Work]

 With this configuration, the installation ring is fixed so that the welded part of the work to be welded is located below the opening of the casing body, and the operator holds the welding torch and welding rod in their respective hands and from the glove hole to the inside of the casing body. The shield gas is introduced into the casing body, the shield gas is blown into the casing body, the inside of the casing body is exposed to the shielding gas atmosphere, and the welding is performed while visually observing the inside from the transparent part.

At this time, by rotating the casing main body or moving the object to be welded as necessary, circumferential and longitudinal welding and flange position welding can be performed.

[0012]

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

The shield casing 1 comprises an installation ring 2 and a casing body 3 rotatably installed on the installation ring. The casing body 3 has an opening 3a at the bottom and a flange on the outer periphery of the bottom. It is made of a transparent synthetic resin having a hat-shaped cross section around the portion 3b.

Further, a shield gas introduction pipe 4, a pressure regulating valve 5 and an analysis valve 6 are provided on a ceiling portion 3c of the casing body 3, and a welding torch 7 and a welding rod 8 are inserted in the body portion 3d. Globe holes 3e, 3e are provided.

Further, a glove hole cover 9 that closes a gap between the welding torch 7 and the arm of the operator having the welding rod 8 is attached to the glove holes 3e and 3e.

The welding operation using the thus configured shield casing 1 will be described. As shown in FIG. 3, the installation ring is placed so that the welded portion of the object to be welded 10 is located below the opening 3 a of the casing body 3. 2, the worker holds the welding torch 7 and the welding rod 8 in their hands and inserts them into the casing body 3 through the glove holes 3e and 3e, and the shielding gas is introduced into the casing body 3 through the shielding gas introduction pipe 4. By blowing out, the inside of the casing body 3 is placed in the atmosphere of the shield gas, and the welding work is performed while visually observing the inside.

At this time, as shown in FIG. 3, when the welding portion 10a in the width direction of the workpiece 10 and the welding portion 10b in the longitudinal direction are continuous, do not move the installation ring 2. The casing main body 3 can be rotated to weld the widthwise welded portion 10a and the longitudinal welded portion 10b.

In addition, when the welded portion 10b in the longitudinal direction is continuous, the object to be welded 10 is previously placed on a movable table capable of moving in the longitudinal direction, and the object to be welded 10 is moved to be installed. It is possible to weld the circumferential welded portion without moving the working ring 2.

Further, in the case of welding an object to be welded 10 having a curved body such as a cylindrical tank, a bottom contact opening as shown in FIG. The shield body spacer 11 that bends together is arranged on the surface of the object to be welded 10, the casing body 3 is installed on top of it to cover the welded portion 10a, and the welded portion 10a is welded under a shield gas atmosphere. You can

Next, for example, as shown in FIG. 5, when welding the body of the large-diameter cylindrical tanks 20, the cylindrical tanks 20 can be rotated in advance by a rotating table such as a turning roll (see FIG. The welded portion 20a is placed in a state of being abutted against (not shown).

Then, the shielded casing 1 is placed so as to cover the welded portion 20 a and the shield body spacer 11 interposed therebetween. After that, the operator holds the welding torch 7 and the welding rod 8 in their respective hands and inserts them into the casing body 3 through the glove holes 3e, 3e, and blows the shield gas into the casing body 3 through the shield gas introducing pipe 4. Then, the casing body 3 is placed in a shielding gas atmosphere, the tubular tanks 20 are appropriately rotated while visually observing the welding state, and the welding portion 20a is held in the casing body 3 to perform welding work. You can

At this time, since the casing main body 3 is rotatable on the installation ring 2, the working posture can be freely moved around the casing main body 3 without holding an unreasonable posture. Welding work can be performed easily, workability is improved, and reliable welding is possible.

When the shield casing 1 is moved and welded, for example, a manipulator such as a manipulator that can move vertically up and down, front and back, left and right at a free speed is used, and the shield is attached to the boom of the manipulator. If the casing 1 is held and moved, the workability is further improved.

A case where a flange joint and pipes are welded to the tubular tanks 20 by fillet welding will be described with reference to FIG.

After the pipes 21 are temporarily attached and fixed to the place 22 where the pipes 21 of the tubular tanks 20 are installed, the shield body spacer having a curved surface conforming to the curve of the tubular tanks 20 11 is placed in contact with the body surface of the tubular tank 20 with the installation location 22 as the center position, the installation ring 2 is fixed thereon, and the shield casing 1 is installed so as to cover the installation location 22.

Similarly to the above, the worker holds the welding torch 7 and the welding rod 8 in their hands and inserts them into the casing body 3 through the glove holes 3e and 3e, and the shielding gas is introduced from the shielding gas inlet pipe 4 into the casing. The pipes 21 are blown into the main body 3 to make the inside of the casing main body 3 under a shield gas atmosphere, and the pipes 21 are fillet welded to the installation location 22.

At this time, since the casing body 3 is rotatable on the installation ring 2, the worker rotates the casing body 3 along the periphery of the pipe end of the pipes 21 as the welding work progresses. As a result, fillet welding can be performed reliably and reliably.

Further, the shield casing 1 of the present invention can be effectively utilized for the position welding work used when joining the flange member to the pipes, which will be described with reference to FIG.

The positioner 30 having a built-in electric motor has a gripping chuck 32 at the center of a rotary table 31 rotated by the electric motor, and the pipes 21 are gripped by the gripping chuck 32. Then, the flange member 33 is placed on the upper pipe end of the pipes 21 and temporarily attached if necessary.

Subsequently, the shield casing 1 is covered with the pipes 21 and the flange member 33, and the installation ring 2 at the bottom of the shield casing 1 is fixed onto the rotary table 31 with bolts 34.

After this, similarly to the above, the worker holds the welding torch 7 and the welding rod 8 in their hands and inserts them into the casing body 3 through the glove holes 3e, 3e, and the shield gas The shielding gas is blown into the casing body 3 from the introduction pipe 4, the inside of the casing body 3 is under the atmosphere of the shielding gas, and the welding work is performed while rotating the rotary table 31.

Although the pipes 21, the flange member 33 and the installation ring 2 are rotated by the rotation of the rotary table 31, the casing body 3 is rotatably provided on the installation ring 2, so that the glove hole 3e, Rotation is restricted by the hand of the operator inserted in 3e.

Therefore, the worker can weld the joint between the pipes 21 and the flange member 33 that rotate in the casing body 3 without changing the work position, and the welding work can be performed easily and the workability is improved. And reliable welding is possible.

As described above, in the welding operation using the shield casing 1 of the present invention, the heat-affected zone due to the welding of the object to be welded is covered with the shield casing 1 and is under the atmosphere of the shield gas. Since it is cut off, it has a good shielding property, and by rotating the casing body 3 and moving the work piece to be welded as necessary, the welding work of a large work piece or a work piece having a complicated shape can be efficiently performed. You can do it.

Although the casing body 3 is made of a transparent synthetic resin in the above embodiment, it may be made of, for example, an aluminum alloy in consideration of heat influence. It is sufficient to provide a transparent window portion for

[0036]

[Effect of device]

 As described above, the shield casing for welding of the present invention comprises the installation ring and the casing body rotatably provided on the installation ring. The casing body has an opening at the bottom and a welding torch. Since a glove hole for inserting a welding rod, a transparent part for visually recognizing the inside, and a shield gas introduction pipe are provided, an installation ring is placed so that the welded part of the workpiece is located under the opening of the casing body. The operator holds the welding torch and the welding rod in their hands and inserts them into the casing body from the glove hole, and blows the shielding gas from the shielding gas introduction pipe into the casing body. Under a shield gas atmosphere and perform welding while visually observing the inside from the transparent part.

At this time, by rotating the casing main body or moving the object to be welded as necessary, circumferential and longitudinal welding and flange position welding can be performed.

Therefore, the heat-affected zone due to the welding of the object to be welded is covered with the shield casing and is in the atmosphere of the shield gas, so that it is shielded from the atmosphere and thus has a good shielding property. This makes it possible to efficiently perform welding work on large objects and objects with complicated shapes.

[Brief description of drawings]

FIG. 1 is a perspective view of a shield casing showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same.

FIG. 3 is a cross-sectional plan view showing an example of welding work.

FIG. 4 is a cross-sectional view of a body spacer

FIG. 5 is a cross-sectional plan view showing an example of the welding work of the tubular tanks.

FIG. 6 is a front view showing an example of a work for welding pipes to a cylindrical tank.

FIG. 7 is a front view showing the work of welding the flange member to the pipes.

[Explanation of symbols]

1 ... Shield casing, 2 ... Installation ring, 3 ... Casing body, 3a ... Opening, 3e ... Globe hole, 4 ...
Shield gas introduction pipe, 7 ... welding torch, 8 ... welding rod, 9
... Glove hole cover, 10 ... Workpiece

Claims (1)

[Scope of utility model registration request] 1. An installation ring, and a casing body rotatably provided on the installation ring, the casing body having an opening at the bottom and a glove hole into which a welding torch and a welding rod are inserted. A shield casing for welding, comprising a transparent portion for visually recognizing the inside and a shield gas introducing pipe.