SU1742005A1 - Method of resistance relief welding - Google Patents

Abstract

Use: when welding covering and covered parts. A hole is made in the male part. The shape and size of the cross section of the hole is chosen similar to the shape and size of the cross section of the male part. The depth of the hole regulate. The hole is deaf, with a bottom relief and a sharp edge. The male part is inserted into the hole of the female part. One of the electrodes is placed on the female part from the side of the hole. A chamfer hole is made in the other electrode. This electrode is placed on the male part. In this case, the electrode chamfer is placed on the side of the welded end of this part. Departure of parts from the electrode regulate. Details are compressed by welding pressure and pass a pulse of welding current. The part to be covered is deformed in the longitudinal and transverse directions. At the same time, they form a joint in the bottom of the hole, fill the electrode chamfer and form a joint in the region of the sharp edge of the hole. 6 Il. (Ls

Description

The invention relates to contact relief welding of products, the relative position of which is such that one part is covered and the other part covers.

An example would be a studded pipe, a pipe welded into a large pipe or a boiler body, a reinforcement bar welded to a plate, a tip welded to a cutter. And other products.

A disadvantage of the known methods is that welding, for example, a rod (male part) with a solid part can only be carried out in the plane.

rod end, which in some cases may not provide the required strength of the joint.

The purpose of the invention is to increase the strength of a welded joint in resistance welding for female and male parts of predominantly dissimilar materials.

This goal is achieved by the fact that a blind hole is made in the female part, in the bottom of which a relief is made, the edge of the hole is sharp, the shape and dimensions of the cross section of this hole are similarly shaped.

ГО GO O

about ate

As the cross-sectional dimensions of the part being covered, the depth of the hole is chosen within the diameter or maximum cross-sectional dimension of this part d, insert one part into another, when placed in the machine, set the reach b of the male part from the electrodes within (0.1 -1) d, during the welding process, the male part is deformed in the longitudinal and transverse direction with the possibility of forming an additional welded joint located along the outer edge of the hole. The method is further characterized in that at the end of the electrode for the male part, a recess is created, and the deformation of this part is carried out with the possibility of filling the volume with the material of the part under the electrode recess and forming a smooth transition from one part to another in the zone of forming an additional welded joint.

The essence of the proposed method lies in the fact that at first they form the first welded joint inside the hole in the female (larger) part. Since it uses a sufficiently large installation length of the smaller part (within the same diameter), it is necessary to form this connection to the local buckling of this part, for which different reliefs of both the larger and smaller part are used. After receiving the first welded joint, the joint of the second one, separated from the first one by an amount equal to the drilling depth, is started. To do this, it is necessary to flatten a part of the rod of the smaller part between the electrode and the surface of the larger part. This is done by passing the current after welding through the rod and heating it to the deformation temperature under the applied welding load. Further, the second welded joint will be normally formed only if the contact transition in the first joint will be shunted by the second joint. For this, electrodes applied to a larger part are installed closer to the second connection than to the first.

Thus, the compound formed on two levels is stronger than the traditional and works better not only for tearing, but also for bending and fatigue. The distance between the levels, i.e. the drilling depth in the larger part should be selected depending on the size and purpose of the parts, but in all cases it is not advisable to place the joints at a distance greater than the diameter of the smaller part, since

welding resistance conditions will deteriorate. In addition, the deformation of the rod in the hole with the distance between the welding levels within the specified limits can form welded joints and along the cylindrical surfaces of the hole.

FIG. 1-6 illustrate flow diagrams.

Figs 1 and 2 show weldables.

0 details are smaller than 1 and greater than 2, electrodes 3 and 4 (in Fig. 1, the heating concentrator is located in a larger part, in Fig. 2 - in a smaller one). FIG. 3 shows the formation stage of the first welded joint 5, with 5 being a welding transformer; 7 and 8, respectively, the current lines flowing at the beginning of welding and at the end. FIG. 4 shows the welded joint at the second time stage of its formation, where a loss of stability occurred.

The rod and barrel formation above the surface of the larger part, with the further redistribution of the current lines - lines 7, 8 weaken and line 9 is strengthened.

5 FIG. Figure 5 shows the formation of a secondary weld 11, with the previous current lines 8 and 9 becoming much weaker than the welding component 10 forming this joint. On

0 fig. 6 shows a section of parts 1 and 2, obtained by resistance welding, containing two successively formed in one heating cycle of welded joints 6 and 11.

5In the example of welding

rod with a diameter of 18 mm from Art. 3 to a plate thickness of 30 mm from Art. 45 according to the current-supply scheme (Fig. 1). Since the plate is much more massive than a rod, the relief

0 is made on the plate by drilling the main hole 018 mm to a depth of 10 mm and an additional $ 12 mm to a depth of 12 mm with the formation of a concentric relief on the side of 3 mm, welding was made 5 d t by machine MP-400, 12 steps of a welding transformer, current 30 kA, total welding time of 1.2 s, compressive force constant and equal to 2 tf. At the same time, first welding takes place inside the hole, then heating

0 rod along the entire installation length and its compression. As a result, partial welding takes place on cylindrical surfaces, and then after the formation of a barrel between the plane of the plate and electrodes installed on the rod, a second welded joint is formed.

Claims (1)

The invention of the method of contact relief welding covering and covered parts, in which a hole is made in one of the parts, a relief is made on one of the parts, the parts are assembled, placed in the welding machine, compressed by the welding pressure, a welding current pulse is passed and one of the parts is deformed, in order to increase the quality of the welded joint due to increased strength, the hole is made in the female part, the shape and dimensions of the cross section of the male part are chosen to be similar to the shape and sizes of the cross section of the female part, the depth and hole are chosen in within the diameter or maximum size d of the cross-section of the male part, the hole is made blind with relief in 0 five the bottom and the sharp edge of the male part are inserted into the hole of the female part, one of the electrodes is placed on the female part from the side of the hole, a hole is made in the other electrode with a chamfer, this electrode is placed on the female part, and the chamfer of the electrode is placed on the side of the welded end this part, the departure of part b from the electrode is chosen from the expression b a + (0.1 -1.0) d, and the female part is deformed in the longitudinal and transverse directions, thereby forming a joint in the bottom of the hole, filling the chamfer of the electrode and forming a joint in the region of the sharp edge of the hole. d  , 2 h L s., 1 S I f - 1 I / l N A p- - -J I / t Ј at v, - k - h 1 -, d  , ifi} Editor A. Motyl Tehred M. Morgenthal Order 2245 Circulation: Subscription VNIIPI State Committee for Inventions and Discoveries at the State Committee on Science and Technology of the USSR 113035, Moscow, Zh-35, 4/5 Raushsk nab. Production and Publishing Combine Patent, Uzhgorod, Gagarin st., 101 FIG. V F ur.5 $ Fig 6 Proofreader T.Paly