RU188817U1 - THERMAL STEM FOR WELDING WIRES OF ELECTROCHEMICAL PROTECTION TO PIPELINES - Google Patents

Abstract

The device relates to the welding of metals by fusion, namely to thermite rods for thermite welding of electrochemical protection wire to main pipelines, made of copper or its alloys, and can be used for welding electrochemical protection leads. Termite rod is cylindrical and formed by cold pressing of powder materials. Its upper layer is made of thermite mixture, including Al, Cu, CuO, and the lower layer is from 1 to 3 mm thick, made of a powder mixture with an increased Cu content relative to the upper layer. The technical result is to obtain accurately predicted temperature and time regimes of combustion, which allows to expand the arsenal of devices for welding electrochemical protection wires to pipelines. 1 hp ff, 1 ill.

Description

The device relates to the welding of metals by fusion, namely to devices for thermite welding of an electrochemical protection wire made of copper or its alloys, and can be used when welding electrochemical protection leads to main pipelines.

Nowadays, copper thermite mixtures in the form of powder, which is poured into reusable collapsible graphite crucibles, are widely used for welding electrochemical protection wires to the main pipeline.

During storage and use of a thermite mixture in the form of a powder, its component-wise separation occurs, in which aluminum rises to the top. Even in the case of thoroughly mixed components when filling the mixture from a measuring glass, there is an uneven distribution of the components of the mixture throughout the crucible-form, which leads to a change in the burning rate, the formation of melt splashes from the crucible-shape and, as a result, a significant reduction in the quality of welding. In case of poor-quality mixing of the mixture, the quality of welding is often completely unacceptable. In addition, when laying and uneven tamping of the powder in the crucible form, areas of lower density are formed, the burning of which leads to melt splashes from the crucible form.

Also known are copper thermite mixtures, hermetically packed into a paper cylindrical shell (solder-welding rods), as well as copper thermite mixtures pressed on a glue base into pencils (thermocouples).

Thus, a thermite mixture is formed, which was molded into a cylindrical thermite rod with a shell according to the RF patent for utility model No. 44575 of 11.11.2004 “A DEVICE FOR THERMAL WELDING OF CATHODE COPPER WIRE ELECTROCHEMICAL PROTECTION OF THE MAIN PIPELINE”, issued on March 27, 2005, published, 2005, 2005, published, 2005, 2003, known, 2004, known

The closest in technical essence is a thermite mixture, formed in the form of a solid compacted charge, containing in the upper part a layer of flammable transitional charge in accordance with the Russian patent for invention No. 2327575 of December 16, 2005 "DEVICE FOR TERMIT WELDING ELECTROCHEMICAL SECURITY PROTECTION TO HOMESTILE HOMELES. , IPC B23K 23/00.

The use of glue for pressing changes the processes of gas formation during combustion, reduces the uniformity of burning, and, as a result, reduces the quality of welding.

The objective of the proposed technical solution is the creation of a device for welding electrochemical protection wires to pipelines with highly predicted temperature and time burning modes, ensuring high-quality welding of electrochemical protection wires to the main pipeline without the use of additional embedded elements.

The task is solved by a device for welding wires electrochemical protection to pipelines, made in the form of a rod of cylindrical shape, while the device is formed by cold pressing of powder materials, contains the upper layer, made of thermite mixture and the lower layer, made of powder mixture with increased relative to top layer, metal content; the bottom layer is made of a powder material with a melting point from 230 ° C to 1600 ° C; the bottom layer is made from 1 to 3 mm thick; the bottom layer is formed from a powder with a high content of copper; the bottom layer is formed from a powder with a high content of iron; the bottom layer is formed from a powder with a high tin content.

The essence of the technical solution is illustrated in the drawing, where FIG. 1 is a device for welding electrochemical protection wires to pipelines.

FIG. 1 shows: a device 1 for welding wires of electrochemical protection to pipelines, the bottom layer 2 with a higher metal content, the top layer 3 of a thermite mixture.

The device 1 for welding wires of electrochemical protection to pipelines, is made in the form of a rod of a cylindrical shape. The device is formed into a rigid rod 1 by cold pressing using a hydraulic press without using an adhesive composition. Forming the mixture into the core occurs under pressure from 20 MPa to 50 MPa. The core thus formed holds the shape without the use of additional means, for example, a shell or glue. In the upper part of the device, layer 3 is formed mainly of thermite mixture. The composition of thermite mixture includes Al, Cu, CuO, and FeMn, as well as other components necessary to adjust the combustion mode. In the lower part of the device 1, a layer 2 of powder material is formed with a melting point of 230 ° C to 1600 ° C. The provision of the calculated melting point of the lower layer 2 is achieved by using a powder material with an increased mass content of the metal relative to the upper layer 3. For example, tin, copper or iron chips can be used as metallic filler for the lower layer 2. So, in the case of using copper, its mass content in the lower layer 2 of the device 1 is from 90% to 99%. In this case, the lower layer 1 with a higher copper content can be formed from copper chips, or from a mixture of copper chips and another refractory component, or from a crumb of a material with high copper content. The bottom layer 2 is made from 1 to 3 mm thick. The thickness of the lower layer 2 and its composition are selected depending on the expected thermal mode of burning of the device 1.

The formation of the device for welding wires of electrochemical protection to pipelines is as follows.

Thermite powder, pre-mixed thoroughly, is poured into the press matrix. On top of the thermite mixture pour powder with a high metal content in the calculated amount. After that, the matrix is placed in a hydraulic press and the mixture is subjected to high pressure. Press thermite mixture in a dry state. At the exit, a ready-made dense briquette of the device 1 is obtained with the upper layer 3 and lower layer 2 differing in composition, uniformly distributed in volume by components, guaranteed by the absence of low-density areas, and also by the absence of polluting components that are not involved in the combustion process.

Welding using a device for welding wires of electrochemical protection to pipelines is as follows.

The formed device 1 is placed in a standard reusable crucible form, placing it down with layer 2 with an increased metal content. The ignition of the device 1 is carried out by standard means, for example, a thermospatch. The burning rate of the device 1, molded by pressing under pressure, is a multiple of the burning rate of the powder. The absence of cavities inside the thermite mixture formed under pressure ensures the stability of its combustion without spills. At the same time, an increase in the burning rate of the thermite mixture leads to the formation of a large number of pores, since boiling melt mixed with a flash poured onto the surface to be welded. The layer 2 with a high content of metal, melting, slows down the burning rate at the final stage, providing the condition for the separation of the melt and slag, which optimizes the mode and improves the quality of welding. The use of layer 2 in the device 1 with a higher content of metal, for example, copper, avoids the use of additional embedded elements, for example, metal membranes. Varying the thickness of the layer 2 with a high content of metal and its composition, provide the optimal mode of combustion of the device 1. Thus, the briquette of the device 1 formed with the help of pressure, including layer 2 with a high percentage of metal relative to the rest of the briquette, has well-predicted burning characteristics and allows to minimize the influence of the human factor in the preparation and direct welding of the wire.

The technical result of the proposed technical solution is the expansion of the arsenal of devices for welding wire electrochemical protection to pipelines with highly predicted temperature and time burning conditions due to a device for welding wire electrochemical protection to pipelines made in the form of a cylindrical rod, while the device is formed by cold pressing from powder materials contains the top layer made of thermite mixture and the bottom layer made of powder mixture with the elevated relative to the upper layer, metal content; the bottom layer is made of a powder material with a melting point from 230 ° C to 1600 ° C; the bottom layer is made from 1 to 3 mm thick; the bottom layer is formed from a powder with a high content of copper; the bottom layer is formed from a powder with a high content of iron; the bottom layer is formed from a powder with a high tin content.

Claims (2)

1. Termite rod for welding electrochemical protection wires to pipelines, made of cylindrical shape, characterized in that it is formed by cold pressing of powder materials, it contains an upper layer made of thermite mixture, including Al, Cu and CuO, and the bottom layer, made from a powder mixture with a higher, relative to the upper layer, Cu content. 2. Termite rod according to claim 1, characterized in that the lower layer is made from 1 to 3 mm thick.

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