JPH01500409A - welded joints - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] welded joints A common method is to first cut the end of the vibrator you want to join diagonally, and then At the end of the vibrator, insert a V-shaped section from the open bottom toward the inside of the vibrator before welding. to form. Welding is done by filling this open bottom, the so-called weld root. So let's start.

Very high quality is required for the welding route, and this high quality is achieved by using advanced technology. This can only be achieved by careful and expensive work by a qualified welder.

In any case, a significant drawback remains: slag forms on the inner surface of the weld root. and this slag must be removed afterwards.

The purpose of the present invention is to provide a new welded joint that eliminates the two drawbacks mentioned above. be.

In the welded joint according to the present invention, the ends of the vibrator to be joined are widened and melted. To prevent contact materials and other impurities from entering the vibrator, at least A cylindrical gold B seal ring is placed in contact with the inner conical surface of the expanded tube end. The thickness of the wall of the cylindrical seal ring is the same as the axis transmitted by the expanded end. Under the influence of compressive force in the direction, the edge of the ring wall bends and bends inside the end of the vibrator. The dimensions are such that it can be tightly and elastically joined to the conical surface, and The wall of the cylindrical seal ring has a The main feature is that a protruding device is provided between the expanded tube ends.

The sealing ring is compressed between the internal conical surfaces of the expanded end and effectively seals the ■-shaped opening at the bottom. , thus preventing slag and loose impurities from entering the vibrator, preventing difficult situations. Even under the Guaranteed quality welded joints.

The importance of obtaining welded joints that are clean on the inside from the start is evident in today's hydraulic piping and In smooth piping systems, cleaning the interior of the piping system before use Up to 60% of all releasable (removable) fittings are supplied for this purpose. This can be explained by the fact that The welded joint according to the invention allows the number of such removable fittings to be dramatically reduced, thus The total cost of raw materials and installation can be reduced by approximately 40% to 50%. ing.

Furthermore, rather than having the end of the vibrator diagonally in the field condition, it is possible to widen the end of the vibrator. It is easier to Conventional tube expansion devices, for example, can accommodate a tube expansion angle of 37 [. A device according to the SAE standard (JiC) can be used.

The accuracy of the tube expansion angle is not that important; for example, a deviation of ±3° is practically important. There isn't.

The weakening (tension) of the vibrator material caused by cold working is caused by the heat of the welding process. It is only temporary because the force is released.On the contrary, if the inner diameter The diameter of the welded joint is enlarged without being enlarged, and this sealing ring is oriented radial forces, these forces are related to the required vibrator wall strength (thickness). due to the fact that it forms an element hardened against the force of , the welded joint according to the present invention has a larger bending moment than the conventional welded vibe joint. It can withstand loads and torsional moments.

in order to have the desired elastic ridges of the edges between the internal conical surfaces of the expanded tube ends; The axial dimensions of the sealing ring, as well as its wall thickness, can be determined relatively easily by experiment. is defined as Other important factors include correct positioning of the sealing ring; That is, it must not be tilted. The devices mentioned above, e.g. , a protruding radial flange between the expanded tube ends serves this purpose. straight hula or exactly three bottles ensure the correct final position of the sealing ring and Ensure an appropriate distance between the expanded ends, but first guide the seal ring to the correct position. and thereby prevent excessive local deformation of the ring edges ( It is preferable that the flange (in the circumferential direction) has some sort of corrugation towards both sides. . These corrugations are essentially flattened and must not be made too stiff.

The present invention will be described below with reference to the accompanying drawings.

The first factor shows a preferred embodiment of the present invention in a partial cross-sectional view.

2 and 3, 4 and 5, and 6 to 9 according to the present invention. 3 shows three other examples of seal rings that have been implemented.

In FIG. 1, the vibe to be coupled is designated by reference number 1. Vibrator 1 The end portion 2 of the tube is widened, and there is at least a substantial portion between the internal conical surfaces of the widened portion. A cylindrical metal seal ring 3 is arranged to press the vibrator 1 in the axial direction. By contracting, the edge of the ring wall 4 bends elastically, and the inside of the expanded end 2 It has a wall thickness that provides a tensile bond to the conical surface. Between the vibrator ends 2 Apparatus suitable for providing axial compressive force to the I don't think it's necessary to show this device in person.

Seal ring 3 must be installed correctly so that the edge of ring wall 4 is excessively large. prevents deformation and thereby prevents distortion between the edge of the ring and the end of the vibe. In order to prevent the elastic tensile bond from being damaged, an outer peripheral flange 5 protrudes outward. It is provided. In order to achieve this purpose, it is theoretically possible to create a straight outer circumference. flange 5 is sufficient, but the seal ring may initially tilt to either side. Therefore, before both expansion ends hit the flange 5, the ring wall 4 or one edge may end up being at least partially over-bent.

This problem is solved by applying corrugations to the flange 5 on both sides thereof, preferably at least on each side. This can be solved by adding waveforms 1o and ii at three locations. Here, we refer to “waveform”. The meaning of the word must be interpreted broadly. The idea is that for Vibe 1 When the axial compressive force is applied, the corrugations become substantially flat due to the axial compressive force. This means that the flange 5 comes into contact with both vibrator ends 2 before the end of the vibrator.

Furthermore, the flange 5 offers the advantage of almost completely closing the ■-shaped opening at the bottom; Also, at least as far as vibrators with relatively thin walls are concerned, the flange can provide the main part or all of the welding material 6 when melted. .

During the welding process, the slap is attached to the ring wall 4 on both sides of the flange 50 and the vibrator. They gather in the cavity between the ends 2 and 2. The inner part of the flange mainly remains unmelted. , together with the ring wall 4 form a radially reinforced structure.

It may be possible to center the ring 7 by means of a protruding pin 9 on the wall 8 of the ring. the bins 9 are preferably at least three in total; good.

The effect of the corrugated portion of the flange as described above is similar to that in the circumferential direction of the ring 70. For example, this can be obtained by using a bottle with an angle of about 45 degrees. Vibrator 1 axis A compressive force in the direction causes the inclined bin to be aligned with the edge of the vibrator end 2. It will be done.

6 to 9 show a third embodiment of the sealing ring designated 12. This is considered the best option. In this example the radial flange The “wave-shaped” portion of 5 is made by making a somewhat radial cut 13 in the flange 5, and obtained by bending the edges 14, 15 in opposite directions at the opening 13. It will be done. (Figures 8 and 9 show an enlarged ′τ diagram of one cut). break A press machine that can make 13 and bend the edges 14 and 15 at the same time. is readily available on the market, and similarly, if we consider a large number of cases, cold It has a cut 13 and a bent edge 14.15 from the short cylinder 4 of the raw material due to processing. A press machine capable of forming the flange 5 having a similar shape can also be easily obtained.

The advantage of the seal ring 12 is that the number of cuts 13 can be limited to 3@, and 2 and 15 without bending back (straightening) the cut edges 14.15. Waveform section 10 in Figure 3. ”ll and the flat bottle 9 in Figures 4 and 5. The point is that it requires less force than the force required to do so.

The seal rings 3, 7.12 in all embodiments are respectively attached to the straight tube part of the vibrator 1. It has a diameter slightly larger than the inner diameter. Ring 3.7 or 12 and tube expansion The sealing effect between the ends 2 and 2 is virtually absolute; This is further ensured by the influence of the internal pressure of Eve 1. Nozomi temporarily flows inside Vibrator 1 ′? IJ acid or other corrosive liquids may enter between the seal ring and the expanded tube end 2. Of course, the media regularly circulating inside the vibrator can also invade. I can't.

Ff3.8FIG, 9 international search report ”-”’　”　PCT/FXB7100099

Claims (7)

[Claims] 1. In welded joints for metal pipes, the ends of the pipes to be joined are widened. to prevent welding material and other impurities from entering the pipe. , an at least essentially cylindrical metal sealing ring is connected to the internal conical surface of the expanded tube end. The wall thickness of the cylindrical seal ring is the same as that of the expanded end. The edge of the ring wall bends under the influence of the axial compressive force transmitted by the dimensions such that it is tightly and elastically joined to the internal conical surface of the pipe end. The seal ring is installed on the wall of the cylindrical seal ring. characterized in that a protruding device is provided between the tube expansion ends to facilitate Welded fittings for metal pipes. 2. The device of claim 1, wherein the device protrudes between expanded tube ends. A welded joint that is an outer flange. 3. The device according to claim 2, wherein the flange is corrugated. welded joints. 4. The device according to claim 3, wherein at least three corrugations are provided. Welded joints. 5. The device of claim 1, wherein the device protrudes between expanded tube ends. , preferably at least three bins. 6. The device according to claim 5, wherein the bottle is located on the outer circumference of the seal ring. A welded joint that is flattened at an angle with respect to. 7. The apparatus of claim 3, wherein the flange is corrugated by the cut. a weld in which the opposite edges of the cut are bent in opposite directions. Fittings.