SU603532A1 - High-frequency welding method - Google Patents

Description

(54) HIGH-FREQUENCY WELDING METHOD

The invention relates to high-frequency welding and can be used, in particular, in the manufacture of welded pipe panels and membrane heating surfaces, pre-fabricated for the manufacture of the ycTaiiOBi.i4 and iiaporeHpriaTOpOB boiler houses. The invention may also be used to manufacture welded I-beams and ribbed panels.

Known methods of high-frequency welding of two elements (tov, in particular pipes, simultaneously} 1n two parallel seams with the help of the third by means of jumpers in the manufacture of pipe panels 1.

The convergence of the lintel to the pipes and the sediment - / anthem is achieved by means of the fact that the width of the blank of the lintel before welding is chosen less than the gap between the pipes into which the lintel must be welded. During welding, a billet of a jumper at the place of precipitation is rolled, it is distributed by a size larger than the distance between the pipes, which causes the surfaces to be welded together and draft. Both stitches are welded simultaneously, while being preheated for rolling the bridge.

However, rolling requires the application of significant pressures to the billet billet, which can reduce its thickness with a simultaneous increase in width. In most cases, pre-heating of the billet and lintel is necessary for rolling. The rolling and preheating operations require a considerable amount of energy and complicate the process, since they cannot be done without additional equipment similar to the processes of hot pressing. Besides,

Preheating the billet billet creates a large temperature drop before welding between the billet and the pipes. Since the heat sink into the body of the pipe from the place of welding of the lintel is significant (due to the large volume of the metal of the tube compared to the bridge), at the time of welding the temperature of the welded surfaces of the tubes is lower than the temperature of the lintel edges, which degrades the quality of welding.

Claims (2)

The closest in technical essence to the proposed invention is a method in which the width of the billet of the web is chosen to be equal to the sum of the gap between the elements and the sediment in two pieces, the elements are set at a given distance parallel to each other, and the force of the precipitation creates a deformation 2. By welding the workpiece of the jumper installed between them 2. When welding by a known method, double stitching occurs in the workpiece of the workpiece, in both cases, the nature of residual deformation, pre-deformation before pressing glue Strongly with changing source profile and a flattened profile of the preform to the original at the moment of welding, which alter the mechanical properties of the original material webs preform. Upon receipt of pipe panels, this reduces the strength of the finished products — pipe panels for gas-tight walls of boiler units and membrane heating surfaces of steam generators. For some materials, such as high alloy steels or titanium, such double deformation is unacceptable. In addition, the known method can practically only be used for thin sheet material, i.e. for blanks whose width is significantly greater than the thickness. To fabricate in this way a pipe panel with a jumper. Between pipes having a thickness and Tsirinin of one order (for example, 6 mm thick with a width of 12 mm) is practically impossible, since preliminary residual deformation of a narrow jumper without material destruction presents great difficulties, Especially if the edges of the workpiece are not pre-warped and the lintels remain in the plane of the sheets so that when filling the welding gap in the squeeze stand, at the moment of welding, move in the desired direction of settlement. The aim of the invention is to simplify the gentle and improve the quality of the product. For this, a billet blank is placed between the connecting elements, for example pipes, so that its longitudinal axis is equidistant from the welded surfaces of the elements, lies in the plane, the neck passes through these surfaces, and is inclined to this plane, and the billet blank is deformed , turn it up to the combination of the welded surfaces of the lintel and the elements being joined. FIG. Figure 1 shows a diagram of the connection of two pipes at the same time by two parallel seams through an interconnecting bridge between them; in fig. 2 shows section A-A in FIG. 1. A welded tube panel cell consists of two tubes 1, 2, parallel to each other, and jumpers 3. Two tubes 1, 2 and a blank 4 jumpers are fed to the welding site in assembled form. In this case, the specified distance between the pipes 1, 2 is maintained, the same as in the finished product. The width of the workpiece 4 is chosen taking into account the fact that a deposit should be provided in each of the two grooves. Before welding, billet 4 is placed between pipes 1, 2 so that its longitudinal axis lies in the plane passing through the welded surface of the pipes and is equidistant from these surfaces. In this case, the workpiece itself is inclined to the plane passing through the welded surfaces of the pipes. Thus, one half of the blank 4 is positioned only one side of the plane of the finished product, and the other half on the other side. The surfaces to be welded (edges) of the workpiece 4 form, with the welded surfaces of the pipes 1, 2, wedge-shaped slots 5, 6, to the side of which contacts 7-10 sum up the high frequency currents flowing through the surfaces and the points 11 and 12 of their convergence and heating them to the welding temperature. As the pipes 1, 2 and the workpiece 4 advance to the points 11, 12 of their convergence, which determine the welding place, the workpiece 4 is gradually deployed in a roller guide (not shown in the drawing) along the shortest direction towards the owls from a welding point. Places of welded surfaces of pipes and lintel billet edges. The last pair of liner rollers 13, 14 at the time of welding brings the workpiece to the alignment of the welded surfaces of the pipes and lintels. At the same time, the workpiece 4 is pressed into the gap between pipes 1 and 2, ensuring that the edges of the formed jumper 3 are pressed against the machine tool of pipes 2 with the force required for settlement, and welding is carried out. At the place of welding, pipes I, 2 are held by rollers 15, 16. It is also possible to weld a pipe with a bridge to the panel, weld two panels together or make I-beams and similar profiles. The proposed method of high-frequency welding simultaneously with two parallel seams in the manufacture of welded pipe panels and other products allows to simplify the technology and improve the quality of the product by replacing the operations of double deformation of the lintel billet by the operation of its deployment. The invention The method of high-frequency welding at the same time two parallel seams of two elementov. mainly pipes connected by a jumper, in which the width of the blank billet is chosen equal to the sum of the gap between the elements and the sediment in two joints, the elements are set at a given distance parallel to each other: -y, and the slump force is created by deforming the jumper blank that is installed. between them, characterized in that, in order to simplify the technology and improve the quality of the product, the bridge billet is placed between the elements to be connected so that its longitudinal axis is equidistant from the surfaces being welded The connected elements lie in the plane passing through these surfaces, and are inclined to this plane, and the billet is deformed by turning it up to align the welded surfaces of the jumper and the connected elements. Sources of information taken into account in the examination: 1. USSR author's certificate To 277984 cl. 23 K 31/06, 1969. 2. Authors certificate of the USSR Law 205183 cl. 23 K 13/00, 1966. Rig. 2