DE2829206A1 - END FITTING DEVICE FOR PIPES AND METHOD OF FITTING THEREOF - Google Patents

Description

Patent attorneys Dipl.-Ing. H. Veickmakn, Dipl.-Phys. Dr. K. Fincke

Dipl.-Ing. F. A. WEICKMANN, Dipl.-Chem. B. Huber Dr. Ing.H. Liska

8000 MUNICH 86, DEN «.
POST BOX 860820 " ** · ^ ¹¹ ' ¹ 1978

MÖHLSTRASSE 22, CALL NUMBER 98 39 21/22

Martin-Thomas Limited

South Way, Walworth Industrial Estate

Andover, Hampshire, England

End fitting for pipe and process
for their attachment

809886/0667

The present invention relates to the application of End fittings on pipes.

Such pipes and fastening devices are used, for example, in the construction of supporting structures, struts and other components used for prefabricated aluminum scaffolding. In the British Examples of the same are shown in U.S. Patent No. 1396602 and described.

The fasteners may be in the form of hooks ₃ eyes ₃ cones or tenons and are made as castings, forgings or other suitable processes which fit into the ends of an extruded or similar pipe.

In one of the previously used methods, the attachment takes place the fastening device on the pipe by means of a weld seam made by hand using a tungsten inert gas welding process with a non-consumable electrode (TIG process) partially around the pipe.

This type of weld can also be semi-automatic or mechanized using a metal inert gas welding process with a consumable electrode (MIG process). The quality of vision and the seam appearance have, however, so far compared to VJIG welding as less favorable for this application

proven, and automation is difficult because of it what is required is to rotate the pipe at a controlled speed. The required voltage is at the beginning of the Welding process different than at the end of the same, and the problem of precise control leads to welds with different looks.

In addition, it is generally held in the art to be exposed to these critical tensile loads when applied Type of welding an additional mechanical fastening is to be provided.

The invention is based on the object of making a weld of good appearance and high technical quality which significantly reduces the need for additional mechanical fastening and enables automatic welding will.

According to the invention this object is achieved in that a tube and an end fastening device are provided which welded to the pipe by weld metal in an opening in the pipe which runs transversely to the length of the tube, wherein; the weld metal attaches through the opening up to a shaft the fastening device mounted within the pipe end extends.

Furthermore, according to the invention, a method for attaching an end fastening device to a pipe is provided,

809886/0667

in which the pipe is welded to a shaft of the fastening device by means of a welding process, in which an electrode or welding wire at the same speed melted like this or this progressively is fed to a weld which passes through an opening in the pipe wall across the length of the pipe and penetrates to the shank of the fastening device, which is located in the end of the tube, the tube during the welding is stationary, as the welding is carried out using a pulse metal inert gas welding process he follows. The metal inert gas welding process is previously known as "MIG" welding, which is used for permanent seams welding is applied.

For the method used in connection with the invention, a power source with an electrode coil, power-operated. Wire drive rollers; a wire feed time limiter and a control unit using an air-cooled welding torch as used in normal MIG welding processes

<? ■ ■

• is used, used. The consumable electrode and the gas nozzle head can be held stationary and above the opening in either the tube or the fastening device being held. An arc is struck, during the duration of which, depending on the required weld size or -Type of welding wire is inserted into the opening in the specified cycle.

For some types of plug welds, it may be preferable to rotate or move the electrode head.

809688/0667

The time limiter lulls the wire feed, the flow of protective gas and the power automatically. Multiple electrode and gas nozzle heads can be operated from a single controller.

A seam can be welded by using the pulsed arc passed through the opening of the pipe or the fastening device (which can be drilled or punched v / ground) will, however, better results were obtained when to form one aligned with said opening Recess was partially drilled into the shank of the fastening device. The hole in the pipe and in the fastening device can be generated at the same time.

The weld metal is brought to the welding point in the usual way by feeding a weld metal rod or wire.

At first it didn't appear as if the application was working A weld metal process to fill a small hole has proven itself ximrde, especially because there are so many changeable Sizes are available, such as the hole depth, the distance of the hole from the pipe end, arc voltage and current, the application time, the gas flow, the type and size of the Welding rod and the torch construction :. However, it has been found that it is entirely possible to get good results although some adjustments to these variable quantities are usually required. Has proven itself For example, there is a 5 nwi deep hole 22 mm from the end of the pipe removed, an arc voltage of 20 at 230-250 amps.,

809886/0667

a welding wire speed of 5 & 5 mm per minute and a welding wire (with plus 5% silicon) of 1.2 mm diameter. The pipe is stationary and the circuit is only switched on for 0.6 to 1.8 seconds to fill the hole with weld metal.

One difficulty was to weld the plug more or less make it flush with the outside surface of the pipe, however this can be done with appropriate coordination of the variable welding sizes, such as the wire feed speed or the current setting can be achieved.

In an alternative arrangement for welding pipes and Fastening devices for forming a framework can be the pipe and the fastening devices in the required Arrangement with welding heads at all required positions for simultaneous welding with a common control. Drill heads can also be included “And be operated automatically from this controller.

The invention is to be explained in more detail below with reference to the drawing. Show it:

Figure 1 shows a casting T-joint with a tube 15 which

is surrounded by a collar 16 which is connected to a tube 17. The welds 13, 19 are produced according to the invention. The collar has a pin 20 (Figure J) within the end of the tube 17.

809888/0687

AO

Figure 2 is a sectional view along the plane B-B in

Figure I ₃

FIG. 3 shows a sectional view along the plane A-A in

Figure I ₃

Figure 2 and 3 the creation of the federal government at 21 and the

complete weld seam 18 ,

Figure H and 5 a pipe 25, which by two welds 28,

which are so close together ₃ that they run into each other, is welded to a pin 26,

FIG. 5 shows a sectional view along the plane C-C in

Figure k,

Figure 6, _3, 7 and 8 views like Figure ^f ! with different weld seam shapes,

FIG. 9 is a perspective view of a hook 3O ₃

which is attached to a pipe 31 by means of a pin on the hook ₃ which engages in the pipe and is welded to it with the welds 32, 33,

FIG. 10 is an enlarged view of the with a circle

marked part of Figure 9,

FIG. 11 shows an arrangement for drilling through drills 3 °, 37

on fixed axes and for welding by welding heads 38 ₃ 39, which are also mounted on fixed axes, whereby the workpiece is rotated between drilling and welding,

Figure 12 is a perspective view of an arrangement

for welding hooks on both of them

609886/066?

Pipe ends of a series of pipes kO, which are successively moved step by step by means of a conveyor 41 to a welding station. At the welding station there are two welding heads 43, 44 which work on the opposite ends of the pipes. There are also two pairs of drills such as drills 363 37 provided. The pipe is drilled and then rotated through a predetermined angle to bring the drilled hole into the welding position. Then the pipe is held immobile while welding. For example, the tube is rotated 18Ο by known rotating devices and is held in place by clamps 46 during welding.

609886/066?

Claims (11)

Claims 1.) Tube and 'end attachment device, characterized in that that the fastening device is welded to the pipe in an opening of the pipe by means of weld metal, the runs transversely to the length of the pipe, the weld metal extending through the opening to a shaft on the fastening device j which is located in the end of the pipe. 2. pipe and Endbefestxgungsvorrxchtung according to claim 6, characterized characterized in that the weld metal also fills a recess aligned with the opening in the shank. 3 »Pipe and end fastening device according to claim 6 or 7, characterized in that two openings are provided, which run into each other and are filled with weld metal. H. Tube and end fastening device according to one of the examples explained with reference to FIGS. 1 to 10 of the drawing. 5. A method for mounting a end affixing means to a tube, characterized _s that said tube is welded by means of a Sclweißverfahrens to a shaft to the fastening device in which an electrode or welding wire is melted at the same speed as he or she progressively a weld is supplied which extends transversely to the length of the pipe through an opening in the pipe wall and penetrates to the shaft of the fastening device, which extends Ö09886 / 0667 ORIGINAL, INSPECTED Χι located in the end of the pipe, the pipe being stationary during the welding and the welding by means of a pulsating Metal inert gas welding process takes place. 6. The method according to claim 5, characterized in that in the shaft a recess aligned with said opening is provided. 7 · The method according to claim 6, characterized in that a Row of pipes is fed one after the other to a welding station by means of a conveyor, where each pipe is drilled out, is then automatically rotated through a predetermined angle so that the drilled hole is brought into the welding position, and becomes stuck when drilling and welding. 8. The method according to claim 6, characterized in - that the opening and the recess in a single drilling operation getting produced. 9. The method according to any one of claims 5 to 8, characterized in that that two openings are provided which run into one another and are filled with weld metal. 10. Procedure for attaching an end fastener: on a pipe, as essentially explained. 11. Device for welding fastening devices to pipes with a conveyor for step-by-step successive 809886/0867 following moving a series of pipes into a drilling and welding position, whereby a drilling device; is provided for drilling one or more holes in the pipe, with a welding device offset from the drilling device for filling the holes with weld metal, with a device for rotating the respective pipe in order to bring the hole from the drilling position into the welding position, and having a clamping device for holding the pipe in place during drilling and welding. 809886/068?