UA45491C2 - METHOD OF SOLDERING TAVOR JOINTS OF PIPES OR RODS OF METAL STRUCTURES - Google Patents

Abstract

Method of soldering or welding-soldering of T-joints of thin-walled pipes or cores of metal elements, tee joints of thin-walled pipes, tubular goods - T-connectors, mainly steel, and also steel fittings is applied mainly at serial manufacturing of elements and structures both of pipe fittings and reinforcing rods - T-joints, tools, rods, pipe-bends etc. and also at their repair. Method of soldering or welding-soldering with arrangement of the solder and flux in soldering gap allows to obtain given geometrical form of a joint of the same strength with the basic metal due to the application of the special device like a die at plastic deformation that distributes axial effort of backup into the pressure of clamping of connected details.

Description

Description of the invention

The invention belongs to the field of soldering, in the part of methods of soldering mainly steel structures and can be applied in various branches of mechanical engineering.

A well-known method of soldering (G.V. Navarov, N.K. Grentsev. Welding and soldering in microelectronics. - M.: Sovetskoe radio, 1969. - p. 54) in which the previously corroded wire is pressed with a pressure of 150 - 160mPa (15 - 16kHs /mm?2) at the moment of heating to the printed circuit board. In the process of plastic deformation of the conductor and crystallization of solder placed under pressure, a strong connection is formed. A similar connection method is used when connecting by soldering with the use of plastic deformation of the parts to be connected, (abbreviated: welding-soldering) (the term welding-soldering has not yet found stable use in the technical literature) of steel pipes, rods, but note that the geometric dimensions of the connected parts in the connection zone are not preserved.

However, the specified method is not intended for soldering leads of plastic materials with a thickness of up to 00.1 mm without deformation of the printed conductor, which does not ensure a uniform connection and is not acceptable for soldering at the joint of elements, for example, from iron-carbon alloys.

A known method of soldering metal structures (Author's certificate USSR Mo 716748 cl. V2ZK1/00, 01.08.75.), which includes assembly of parts with placement of solder and flux in the soldering gap, application of clamping force with the formation of plastic deformation of parts in the joint area. The method is used to join dissimilar metals, and the maximum deformation of the hardest of them is 20905.

The destruction of the connection occurs on a softer metal.

A known method of soldering metal structures, mainly steel ones (av. St. Mo 1133054), which included assembling parts with the placement of solder and flux in the soldering gap, heating to the soldering temperature and plastic deformation of the parts in the joint area by applying pressure, while plastic sch 29 deformations form in the range of 40 - 60905. Go)

But in the case of joining parts made of homogeneous materials in a joint, in particular steel parts, this method does not ensure obtaining a soldered joint of uniform strength of the main metal, due to the fact that the deposition force is transmitted directly to the joint of the part in the direction of the axis .

The invention is based on the task of improving the known method of soldering due to the use of a special device during plastic deformation of soldered parts, which decomposes the axial force (He) of deposition into the clamping pressure of the parts to be joined, and in this way connections of equal strength to the base metal are obtained, as well as the geometric shapes of the connection are added and saved. WITH

The essence of the invention is that in the method of soldering T-shaped joints of thin-walled pipes or rods of metal structures, preferably steel, which includes the assembly of parts with the arrangement of solder and flux in the soldered gap in the form of an embedded element, or by applying to the connected surfaces in the form of a mixture of solder and flux, dilutions in the binder, heating to the melting temperature of the solder, and plastic deformation of parts in the joint area by applying deposition pressure, which is characterized by the fact that plastic deformation is carried out using a calibration tool, made "and in the form of a stamp. -at

Due to the use of a calibration device, the deposition force is distributed into a uniform pressure from the compression of the parts that are connected along the entire soldering plane, which strengthens the metal in the seam due to the disappearance of shrinkage porosity and "healing" of microcracks with solder, and also allows you to add and preserve the necessary the form of the compound during deposition.

Obtaining T-joints of thin-walled pipes, rods and plates with equal strength to the base metal can be explained by the contact strengthening of the metal of the solder joint, the absence of a cast structure, a shrinkage shell, and "healing" of microcracks with solder. 1 But in the case of joining parts made of homogeneous materials in a joint, in particular steel parts, the specified method does not ensure obtaining a soldered joint of uniform strength of the main metal, due to the fact that the deposition force is transmitted directly to the joint of the part in the direction of the axis. (Se) 50 The advantages of the method include the possibility of mechanization and automation of the specified process, as well as an increase in labor productivity.

Fig. 1 shows the scheme of the implementation of the method.

Item 1 - steel plate; item 2 - rod; 59 item 3 - movable clamp;

GF) item 4 - inductor; t item 5 - movable clamp for compression; item 6 - calibration stamp.

Fig. 2 is view A of Fig. 1. because the soldered parts, in this case the steel plate pos. 1 and the rod pos. 2 are located in the movable clamp pos. 3 of the induction or other heating unit. Inductor item 4 heats the soldered parts to the soldering temperature from the outside. At the same time, the solder and flux previously applied to the lids of the parts are melted. Under the action of force P on the movable clamp item 5 and on the stamp item b, the parts are compressed. The base metal of the plate (item 1) and the rod (item 2) in the contact zone will be plastically deformed. because when the soldering gap is filled with deformed metal and the gap "b" (Fig. 2) disappears, the deposition force in the clamp pos. 5 stops.

According to the given scheme, steel pipes with a diameter of 20 mm and a wall thickness of 1.5 mm were welded and brazed into a tag (which have a strength limit of 500MPa (50kHs/mm 2). The pipe neck was machined at the point of contact with a mechanical tool. Brass - LbZ was used as solder, which was placed in the form of a foil - an embedded element in the soldering gap together with flux (flux - brown Ma»Vgo»?7).

According to the results of the measurements, it emerged: the change in the mechanical qualities of the welded joint has a qualitative jump in the direction of increasing the tensile strength when the base metal is deformed in the compression zone when a force of p - 300 - 350 MPa (30 - 35 kHs/mm) is applied. 70 Obtaining T-joints of thin-walled pipes, rods and plates with equal strength to the base metal can be explained by the contact strengthening of the metal of the solder joint, the absence of a cast structure, a shrinkage shell, and the "healing" of microcracks with solder, which gives higher quality properties in terms of strength in relation to the connection of these parts using arc welding.

As the experiments show, it is quite difficult in practice to ensure uniform heating of the parts to be connected and the desired deformation of the connection (in the case of a T-joint - a complex, closed, saddle-like shape of the lid). To compensate for this shortcoming, the formation of the welded-soldered joint was formed by controlling the given movement of the parts to be joined in the die.

This method of welding and brazing of T-joints will be widely used in the production of T-shaped joints used in mechanical engineering, in the production of rods, welding of levers to plates, production of keys (welding "beards" to keys), as well as in small-scale production in the production of small parts, or in the serial production of tractions for cars and tractors.

The specified method of connecting branded parts may replace other welding methods that were used to connect the specified parts, namely manual arc welding, gas flame soldering, furnace soldering. The method also does not require highly qualified personnel and excludes the harmful effects of He welding processes on humans. at

Claims (1)

The formula of the invention "- The method of soldering T-shaped joints of pipes or rods of metal structures, preferably steel, which consists in assembling parts with the location of solder and flux in the gap to be soldered, heating to about the melting temperature of the solder, and plastic deformation of the parts in the zone of union by "And applying deposition pressure, which differs in that a developed soldering surface is previously created by making a groove in one of the parts, and plastic deformation is carried out with the help of a calibrating tool in the form of a stamp by creating uniform pressure in the direction perpendicular to the axis although "And b of one of the connecting parts. - . and? sh» 1 sh» se) - name) 60 b5