SU651917A1 - Method of making "closed tables" for reinforced-concrete articles - Google Patents

Description

The invention relates to the field of metal forming and welding in the production of embedded parts, in particular "closed tables for concrete products by resistance welding. The closest in manufacturing technology, essence and achievable goal is a method of manufacturing "closed tables for concrete products by resistance welding, including cutting holes with simultaneous punching of recesses in the plate, assembling plates with rods, their subsequent clamping and supplying the welding current through rod 1 The manufacture of "closed tables in this way is practically time consuming because of the impossibility to prevent significant deformations during welding of the next, after the first rods, the number of which in closed tables is 2, 4, 6 and more. The effect of atmospheric conditions leads to rapid oxidation at the points of contact between the rods and plates and the formation of corrosion products in the gaps, which makes the joint moving after a certain period of operation of the structure. By virtue of the fact that such a compound is stressful as a result of the shrinkage of the metal after its cooling, the rate of corrosion increases sharply compared with the rate of corrosion of the original elements. In order to increase the productivity and quality of the welded joint and to mechanize the process according to the proposed method, anchor shoulders are preliminarily made on the rods at a distance from the end of 1.0-3.5 diameters of the rod, on which the plate is mounted, orienting it with projections around the holes to the side the collar on the rod, and welding is performed by passing a current through the plate in the zone of its connection with the rod with the draft of the protruding part of the rod. FIG. 1 shows the connection of the elements of a “closed table”, a general view: in FIG. 2 - connection in the process of welding, cross section. A method of manufacturing embedded parts of the type "closed table" is carried out as follows.

 -J-; r l: fr SKi5 5 First, on the rod 1 at a distance from the end 2, equal to 1.0-3.5 diameters of the rod, the flange 3 is made by upsetting the material by means of heating by electric current or by mechanical means. The flange of the races is believed, depending on the thickness of the plastia) 1 and the rod at a distance from the end of the latter, equal to 1.0-3.5 of the diameter of the rod. In the plate 4, a hole is cut under the rod with a simultaneous stamping of conical or curvilinear shape of relief 5. Then the sterols I are clamped with a mechanical clamping device 6, and the plates 4 are put on the ends, orienting them with the projections towards the collar 3. plate 4 and the end 2 of the rod 1 using electrodes 7 and 8 are supplied from the welding current transformer (Jc /) and create pressure (Rg) on the end portion of the rod 2, coming out of the recess on the plate 4, and on the annular portion of the plates: s 4 .As a result of this in the contact zone And fuses the welding process. Further, as the heating and lateral deformation of the end of the rod I, the contact zone covers new areas B and moves towards the surface B, forming a recess on the plate 4. At the same time, the shaft of the rod I, flattening, takes the form of an end anchor (anchor head) a recess on the plate 4 and firmly connected along the surface L, B, C in contact with the plate. Thus, a riveted-welded connection of a rod with a plate occurs, in which the head landed on the rod performs the functions of an anchor when a load occurs in both directions along the axis

the rod, and the welded joint in the area of contact (A, B, C) of the rod with the plates enhances the joint work of the elements in the joint, eliminates the possibility of rolling and shifting in it, as well as corrosion by the contact of the elements. The latter is particularly important, taking into account the operating conditions of the surfaces of embedded parts exposed to corrosive effects.

.-: -: i: - .- i-sfiii i

ore, orienting it with protrusions around the holes in the direction of the collar on the rod, and welding is carried out by passing a current through the plate in the zone of its connection with the rod with the draft of the protruding part of the rod.

Sources of information taken into account in the examination

Claims (1)

1. Copyright certificate Jvfo 242220, cl. B 23 K 11/10, 1964. The different length of the part of the rod protruding from the recess on the plate (1.0-3.5 of its diameter) determines the size of the end anchor head, which may be different depending on the ratio of the plate thickness and the diameter of the rods, and also the set durability of the connected elements. When carrying out the process of welding elements according to the proposed method, it is possible to carry out various forces in contact with the rod (RS # rod) and with the plate (Pef plate) and adjust them depending on the specific ratios of the plate thickness and the rod diameter. The use of a one-way current supply circuit for welding the end of a rod 2 with a plate at relief 5 makes it possible to simplify the conditions for the electrodes to approach the welding site, and also makes it possible to simultaneously weld both ends of the anchor rod and even several rods using compact electrode assemblies. The invention method of manufacture. "Closed tables for reinforced concrete, 1X products by resistance welding, including cutting holes with simultaneous punching of recesses in the plate, assembling plates with rods, their subsequent clamping and supplying welding current through the stitch, characterized in that In order to increase the productivity and quality of the welded joint and mechanize the process, anchor pins are made on the rods at an OTTOpiia distance equal to 1.0-3.5 diameters of the RP3 rods on which the plate is mounted PI-plate rod plate SVNAROTS TRANS ROR / ATOR Rig. /