KR850000521Y1 - Flux dam for submerged arc wolding - Google Patents

Abstract

No content.

Description

Permanent Welding Flux Support Structure

1 is a perspective view of a welding head operatively coupled to a workpiece and supporting a rotating dam, which is an embodiment of the present invention.

2 is a plan view of the dam of FIG.

3 is a partial cross-sectional view of the dam and workpiece of FIG.

4 is a diagram illustrating a relationship between adjacent belt pieces of the same size.

The present invention relates to a flux support structure for latent welding, which supports a welding flux layer around an end of a machined surface to be cladding by arc welding, thereby preventing molten slag and metal from escaping from the machined surface. will be. In more detail, the present invention relates to a dam structure which is stationary with respect to a welding surface. The whole unit of the dam structure moves in cooperation with the welding arc and continuously collects the welding flux to be supported and melted by the welding arc. Provide continuous molds for slag and metal.

In arc welding to a horizontal plane, there is a problem that it is very difficult to maintain molten slag and metal around the horizontal end to form a metal bead coplanar with the horizontal plane end of the workpiece. Arc welding, which allows molten slag and metal to be positioned below the flux layer, is usually smoothly coated on the horizontal plane up to the end or corner portion of the machined surface. However, when the molten slag and the metal forming the beads reach the end of the machined surface, a vertical wall descending from this end provides an undesirable path to escape both the molten slag and the metal. Thus, a barrier must be provided to prevent this molten slag and metal from escaping from the end of the workpiece.

Various types of exit bars and tabs have been developed in the past but need not be examined in detail. This is because the present invention solves the problem of keeping molten slag and metal around the outer end or corner of the workpiece, and it will be enough to explain only this problem. The ends of the various workpieces are not all simple, nor are they straight lines, and of course the ends are of various lengths. Some workpieces have curved ends to prevent release of the weld material until the molten weld material solidifies. Conventionally, an operator grasps a long angle iron along an end of a face of a workpiece and collects a flux coating layer thereon to form a mold for molten material by arcing around the end of the workpiece.

The installation of a mechanical support for the flux around the end of the workpiece with long square iron is a simple solution to the above problem. However, in this method, manufacturing speed is limited because square iron having a suitable length and contour suitable for the end length and the contour of the workpiece must be used.

Therefore, the dam structure of the present invention as described below is indispensable. In other words, the dam structure can be connected to the weld head itself to move with the weld arc and move forward with the arc to provide a continuous mold function and to provide time for the arc to solidify before the bead forms the weld material. The far front can consistently support the flux layer. It is not necessary to actually attach the dam structure to the weld head. However, they all need to stay in the same direction. Using the dam structure, it is simple to make a good place in the weld head that is attached to arc welding and to cooperate with high efficiency. In order to form a support structure covering the flux coating layer, the dam or barrier structure must abut the vertical surface below the end of the working surface.

Engagement with the vertical surfaces of the workpieces of the dam structure should not slip together. This is because the flux which must be stationary with respect to the molten slag and the metal during the solidification until the molten metal forms a bead by such a sliding causes movement.

The present invention employs a continuous belt, which is attached to a series of segments formed in the form of a caterpillar scaffold that is in contact with the vertical end face of the work piece so that the pieces work together to form a concave surface around the work end. This concave surface supports the laminated structure covering the flux of particles, and at the same time serves as a mold for the molten material generated by the welding arc, so the flux accumulated at the level below and above the arc is used as the laminated structure. Keep it.

The invention also includes a plurality of segments formed in the form of a horizontal structure on a continuous belt around a pair of parallel rollers connected to the weld head, which engage the vertical surfaces of the workpiece to drive the belt by frictional engagement. . Other objects, benefits and features of the present invention will become apparent to those skilled in the art from the following description taken in conjunction with the accompanying drawings.

Although the present invention is embodied in a relatively simple configuration as shown in the drawings, it is more important to explain using terms specific to the welding field. Those who read this specification think that they are already familiar with submerged arcweling methods. Thus, the terminology used herein should be understood in connection with latent welding.

The molten electrode (or core wire) guides a large amount of current through the weld head to allow arcing to the face of the workpiece. The advancing molten electrode is melted by a continuous heat of ike and is formed as a bead on the surface of the workpiece.

Arc continues under the continuously supplied flux layer. There are various flux materials as well as molten electrode materials. For any kind of material, the flux is usually particulate and flows like sand from its source. Particulate flux falling onto the arc is referred to as the arc flux layer and basically serves to shield the atmosphere from the weld. Of course, not all of the flux is consumed around the arc. Reusable extra flux is recollected through a properly placed vacuum system.

The mechanical structure for positioning the workpiece surface to prevent the flow of molten material by the arc is called a dam. The dam controls the distribution of the molten flux as a barrier or flow prevention mechanism and then controls the molten metal of the molten electrode. The basic structure of the present invention can be seen from the structure of the dam.

In order to specifically form a dam according to the present invention, a series of block-shaped pieces, usually made of metal, are attached to a loop-shaped continuous belt guided on two parallel rollers. Considering the straight line spacing between the blocks as the belt moves around each roller and the straight line spacing around the rollers, this piece reminds us of the tractor filter foot of the tractor. It should be appreciated that the solder formed as a caterpillar scaffold is suitable to be attached to the weld head and continuously supported. Thus, the dam must be attached to the weld head and the dam must be positioned relative to the arc sustained by the molten electrode suspended downward from the weld head. The caterpillar scaffold dams are driven together with the weld-arc to move continuously to control the arc molten material. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 shows a machined surface of a general form. The machining surface 1 extends in a substantially horizontal plane so that when the beads formed by the welding method solidify, the beads are most suitably controlled by gravity on the horizontal plane. Of course, the machining surface 1 does not have to be completely flat or completely horizontal. Importantly, the present invention solves the problem that the machined surface 1 necessarily reaches the end 2. Around this end 2 there is a cliff, generally descending from this end, ie a vertical wall 3 of the workpiece 4.

The workpiece 4 may have many different forms. It is not the object of the present invention to impart various other forms for the work piece 4. The workpiece can have, for example, a thick cylindrical wall, which should cladding the end of the thick wall and its inner surface. The cylindrical workpiece is rotated while facing the inner wall to be clad so that the cladding inner wall can carry a volume over its curved surface as it rotates under the weld head. If the end of the thick wall of the cylinder also needs to be clad, the cylinder is held vertical and horizontally supported below the weld head on the face formed by the thick wall. Embodiments of the present invention have been studied to exert a function of controlling the molten welding beads at the ends of these surfaces.

In order to fully describe the present invention, it is sufficient to describe the flat machined surface 1 having the end 2 and the vertical surface 3 of the work piece 4. The welding head 5 supported by a mechanism not shown forms molten beads from the molten electrode 6 on this flat working surface 1 when cladding.

The welding head 5 clads the machining surface 1 as beads 7 adjacent in parallel. The end of this bead is around the end 2. Problems arise when forming this last bead.

The weld arc produces a molten material flowing on the machining surface 1. When this molten material is produced to cover the end 2 sufficiently to form the last bead 7, a part of the molten material flows over the end 2 if it is not stopped by a barrier or dam. This is a problem that the present invention is trying to solve.

Controlling molten metal and flux produced by the weld arc at the end of the machined surface has not been sufficiently studied in the past. Conventionally, various elongate members are gripped by the surface end 2 of the machined surface to provide a barrier or dam. This barrier or dam limits this bead material so that the molten bead material solidifies in the same plane as the end 2. Cutting and gripping the barrier structure at the end of the working surface is at best a first aid. The present invention solves this problem and can achieve a certain result by stopping the cladding material in the most suitable way around the end 2.

1 shows a latent welding method performed by the welding head 5. The large current supplied to the molten electrode 6 flows through the gap between the end of this electrode and the grounded working surface to generate arc, melting and consuming the molten electrode whose heat is constantly advancing, and the molten material of the molten electrode 6 is processed on Towards (1) it hangs in the shape of a tongue. This weld eye needs to be shielded from the atmosphere and for this purpose the flux is supplied as an arc coating.

A hopper not shown is the particulate flux source. The flux is directed from the hopper into the conduit 10 to fall on the arc. When installing the hopper, it is possible to install a number of connecting members in the hopper so that the flux can flow down the top of the arc like sand to completely lock the arc. Conduit 10 is shown to embody these connections. Flux material is not necessary in the present invention and does not need to be described in detail. Various materials are used as the flux material, and some are used to form alloys with the molten metal of the electrode. Regardless of the type of material, the main function of the flux is to isolate the molten material of the electrode from the atmosphere.

The flux is oversupplied. A portion of the flux is intended to melt by contact with the molten electrode and flow with the molten metal. This slag solidifies to upper shape on the beads and can then be removed relatively easily. All of the flux residue that is not actually slag is then vacuumed from the side of the workpiece and circulated to the hopper and recovered. The present invention forms a layer 11 around the end 2 by using excess flux and collecting the flux in the structure according to the present invention. The flux in the form of particles flows like sand breeze, as described above. The flux is in this case guided to flow into the support structure provided by the embodiment of the present invention, acting like a molding sand for the molten material by the arc. Thus, sufficient welding flux is supplied along the end 2 to form a layer 11 around the end 2, which acts as a barrier or dam for the molten material produced by the arc. As a result, the metal beads solidify to be flush with the end 2.

In FIG. 1, the dam 15 is shown in a state maintained around the end 2. Dams 15 are shown in detail in FIGS. 2, 3 and 4. The dam 15 is shown in FIG. 1 as being held around the end 2, and the dam is in contact with the surface of the vertical wall 3 and is attached like a device comprising a welding hag 5. This is clearly shown. In particular, the plate 16 is a link between the dam 15 and the head 5.

The dam 15 is formed and driven by a series of pieces 17 at predetermined positions around the wall 3 and the end 2. Each piece 17 is independently attached to the belt 18 and the belt 19 is connected between two parallel rollers as shown in FIGS. 2 and 3 described below. The belt 18 with a series of pieces 17 is adapted to rotate by frictional engagement of the wall 3 with the face of the piece 17. The dam structure 15 is moved in parallel with the whole wall 3 and one side of the piece 17 is kept in frictional engagement with the wall 3. When the belt 18 is rotated, the pieces 7 are continued with a predetermined space with respect to the end 2.

The belt 18 is flexible to move around the roller of the dam 15. In order to bring the piece 17 into contact with the surface of the vertical wall 3, a supporting plate 19 (see FIG. 2) is installed near the rear surface of the belt 18 and is supported to apply pressure to the back surface of the belt 18. 17) With this predetermined force, abuts on the surface of the vertical wall (3).

The dam 15 is connected to the head 5 so that a weld arc is generated opposite the aligned piece 17 of the dam 15. The piece 17 is shaped to form a groove or passage along the wall 3 at the bottom of the end 2, which is deposited around the trough so that the flux from the conduit 10 into the layer 11. This allows sufficient flux to be deposited in the grooves formed by the dam 15 to limit the molten material by the mobile welding arc as a barrier around the end 2 to prevent the molten material from falling off the vertical wall 3 surface.

FIG. 2 shows only the dam 15 drawn from FIG. 1 with the dam viewed from above. It can be seen that the piece 17 is attached to the belt 18. In particular, it is important to be able to see the relationship with the belt 18 of the parallel roller 20.21 more clearly. FIG. 1 shows the relationship in which these rollers are held together by a plate and in FIG. 2 the plates holding these rollers are removed so that the belt 18 and the pressure plate together with the rollers 20 and 21 are more clearly visible. .

The end 2 of the workpiece 4 is shown to show that the vertical plane of the piece 17 abuts the vertical plane 3 of the workpiece. When the dam 15 moves parallel to the vertical plane or wall 3, the belt 18 and a predetermined number of pieces 17 attached to the belt are held along the end 2 to receive the flux from the conduit 10. To form a groove or trough. The dam 15 thus provides a structure that moves with the weld arc, which provides an extremely important groove or trough which stops against the workpiece to maintain a flux layer around the end 2.

3 shows the operating position of the dam with respect to the vertical wall 3 of the workpiece 4 and the end of the working surface 1. In Fig. 3, the pieces 17 held against the vertical wall 3 form a groove or trough 25 that receives the flux from the weld arc front surface and forms the layer 11.

The flux supply device indicated by conduit 10 in FIG. 1 is not shown in FIG.

3 shows the layer 11 as a mold such that an appropriate amount of flux to form the layer 11 covers the welding arc around the molten electrode 6 and maintains the welding material by the arc in substantially the same plane as the vertical wall 3. It is indicated that the supplied to be filled in the groove 25 to the height to form a). Each piece 17 has a face 30 which abuts the vertical wall 3 when the belt 18 is moved. The material of the piece 17 is selected to have a coefficient of friction which causes the belt 18 to move around the rollers 20, 21 by friction with the wall 3.

The device for attaching the piece 17 to the belt 18 can be selected from a plurality of suitable mechanical fasteners. Considering the general conditions of use and the heat around the dam, the belt 18 can be made of a material with a moderately rough surface, suitably high in rubber content for flexibility.

3 shows the contour of the piece 17, which can be said to be a chair shape to clarify the piece. Thus, the bottom and rear portions of the chair-shaped pieces located on top of the wall 3 form a groove or trough 25.

The adjusting device for supplying the flux to the welding arc overfeeds the flux into the grooves 25 to form a flux layer 11 of a size that forms a mold for the molten material around the welding arc. At the end of the feed, the layer 11 rises around the end 2 to form a barrier which is effective to limit the molten material by the welding arc until these molten materials solidify and self-support around the end.

4 shows an example that solves the special problem of controlling this flux when a flux such as sand is supplied to the bottom of the groove 25. The chair pieces 17 are aligned with each other around the end 2 by being attached to the belt 18. In this case, it is necessary to prevent the flux, such as sand, from falling from the adjacent end of the piece 17 and FIG. 4 shows this flux fall prevention structure.

In Fig. 4, the plate 31 extends beyond the gap between the chair piece 17 attached to the "sitting part" and the adjacent side of the piece and the adjacent piece. The plate 31 provided in the piece 17 in this way becomes an effective cover for the gap between the pieces around the bottom of the groove 25. As a result, sand-like fluxes do not accumulate in the gaps between the pieces and prevent accidental misalignment of the pieces.

The dam 15 having the configuration as described above can be seen as having the caterpillar scaffold of the tractor. The dam 15 having a face 30 of a piece 17 which extends to the surface of the vertical face 3 of the work piece 4 mimics the caterpillar footing of a tractor. However, the comparison with the caterpillar scaffold of the tractor does not make the contents of the present invention more clear.

By the present invention it is important that the dam is operated by the engagement (frictional coupling) between the piece 17 and the wall 3. However, it should be understood that the dam can be moved along the wall 3 by a motor geared to one or both of the rollers 20, 21.

The present invention does not solve all the problems in operating the dam structure described above. Modifications to the embodiments of the present invention can be seen essentially from the drawings, the description itself. However, the problem of controlling the flow of the flux is not part of the present invention. In addition, collecting the flux from the part after the welding arc and the dam has retreated is performed by the suction nozzle 40 of the vacuum apparatus shown in FIG. This vacuum nozzle is placed at a suitable position behind the welding arc and the dam, and sucks excess flux which is not hardened and is returned to the hopper supply conduit 10.

The basic content of the present invention is a structure in which a flux layer is maintained around an end of a workpiece and the second layer acts as a dam or a barrier to the molten material of the welding arc. This flux acts like a molding sand and stabilizes the molten material around the end of the workpiece to prevent these molten materials from falling off the end. In particular, the beads of the welding method are formed almost coplanar with the workpiece. From the foregoing description, the present invention has been studied considerably to achieve all of the above-mentioned purposes, with the 200 million evident and inherently obtainable by the device according to the present invention.

While the embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the specific embodiments, and various changes and modifications may be made without departing from the scope of the present invention.

Claims (1)

Weld cladding on the workpiece's horizontal machining surface with a weld head installed on a horizontal machining surface, a path on the surface, to form a metal bead along the end, the end of the workpiece's vertical wall surface, and a surface extending substantially horizontally. In the interlock welding flux support structure, the chair is shaped and each rear is connected to the continuous belt 18, and the front end surface 30 is frictionally engaged with the vertical wall surface below the end of the workpiece, and the arc welding head is provided below the bead. Latent welding flux support comprising a dam (15) consisting of a series of interlocking pieces (17) to form a trough (25) below the workpiece surface where it is located to act as a mold to limit molten material. rescue.