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Welding technology for mineral insulated cable

A technology of mineral insulated cables and welding processes, applied in welding/welding connections, circuits, connections, etc., can solve the problems of damp cables, unreliable connections, and high costs, and achieve the effects of easy installation and construction, good reliability and low cost.

Inactive Publication Date: 2016-11-09
上海安捷防火智能电缆有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, due to the limitations of traditional production technology, equipment, raw materials and many other factors, the current production and supply length of mineral insulated cables are difficult to meet the needs of various projects. In order to meet the needs of various projects, it is necessary to combine mineral insulated cables with another Mineral insulated cables are used for docking, but in the prior art, connectors are often used to connect the connection ends of two mineral insulated cables that need to be docked together. The use of connectors for connection has the following disadvantages: difficult construction, high cost, and poor reliability , It is difficult to solve the sealing of the connection part, and it is very easy to make the cable damp, which seriously affects the practical performance of the cable
[0004] However, in view of the deficiencies of the existing technology, it is necessary for the researcher to develop a welding method with low processing cost, simple operation and high welding reliability, which can be directly completed in the manufacturing plant, passed the inspection and shipped out of the factory, avoiding the difficulty of on-site construction technology and unreliable connection. The welding process of mineral insulated cables that can ensure the mechanical strength and electrical conductivity of mineral insulated cables after welding

Method used

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  • Welding technology for mineral insulated cable

Examples

Experimental program
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Effect test

Embodiment 1

[0020] The invention provides a mineral insulated cable welding process, including the cold extrusion welding process of welding the conductors of the first mineral insulated cable and the second mineral insulated cable together and welding the first mineral insulated cable and the second mineral insulated cable The sheaths are welded together by a brazing process.

[0021] The cold extrusion welding process includes the following process steps:

[0022] 1). Strip off the sheath of one end of the first mineral insulated cable to expose a 6-10cm conductor, and then strip off the sheath of one end of the second mineral insulated cable to expose a 6-10cm conductor, the first mineral insulated cable The length of the stripped exposed conductor of the cable and the length of the stripped exposed conductor of the second mineral insulated cable can be determined according to specific conditions;

[0023] 2). Connect the conductor of the first mineral insulated cable with the sheath ...

Embodiment 2

[0031] In this embodiment, the brazing process includes the following process steps:

[0032] 1). Filling the brazing filler metal of Ag12% and Cu88% in composition and mass percentage in the welding seam of the first mineral insulated cable and the sheath of the second mineral insulated cable;

[0033] 2). Set the heating coil on the outside of the solder and turn on the power, so that the heating coil will heat the solder to the brazing temperature of 650°C within 8s;

[0034] 3). Disconnect the power supply of the heating coil, cool down to room temperature naturally, and finally remove the heating coil, the brazing process is completed, the hardness of the brazing section is 105HRC, and the rest of the process steps are the same as in Example 1.

Embodiment 3

[0036] In this embodiment, the brazing process includes the following process steps:

[0037] 1). Filling the brazing material with composition and mass percentage ratio of Ag14% and Cu86% in the welding seam of the first mineral insulated cable and the sheath of the second mineral insulated cable;

[0038] 2). Set the heating coil on the outside of the solder and turn on the power, so that the heating coil will heat the solder to the brazing temperature of 600°C within 5s;

[0039] 3). Disconnect the power supply of the heating coil, cool down to room temperature naturally, and finally remove the heating coil, the brazing process is completed, the hardness of the brazing section is 90HRC, and the rest of the process steps are the same as in Example 1.

[0040] Table 1 is the hardness result of the brazing section after completing the brazing process;

[0041]

[0042] However, in the prior art, special connectors are often used to connect the connection ends of two minera...

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Abstract

The invention discloses a mineral insulated cable welding process, which includes a cold extrusion welding process for welding conductors of a first mineral insulated cable and a second mineral insulated cable, and welding the first mineral insulated cable and the second mineral insulated cable The sheaths are welded together by a brazing process. The invention has low processing cost, simple operation, high welding reliability, can ensure the mechanical strength and complete electrical conductivity of the welded mineral insulated cable, and realizes large-length delivery.

Description

technical field [0001] The invention relates to the technical field of welding of mineral insulated cables, in particular to a welding process of mineral insulated cables. Background technique [0002] Mineral insulated cable is an insulated cable with high conductivity copper as conductor, inorganic magnesium oxide as insulation, and seamless copper tube as sheath. The cable can work continuously at a high temperature of 250°C, and can work continuously at a high temperature of 1083°C for a short time under special circumstances. It has the characteristics of high temperature resistance, corrosion resistance, no aging, waterproof, explosion-proof, anti-magnetic interference, smoke-free and non-toxic It can guarantee the safety of the public and buildings to the greatest extent. It is a safe and environment-friendly cable with the highest comprehensive performance that can meet the country's increasingly stringent safety requirements and modern design specifications. [000...

Claims

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Application Information

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IPC IPC(8): H01R43/02H01R43/033
CPCH01R43/0207H01R43/033
Inventor 伏荣斌张余
Owner 上海安捷防火智能电缆有限公司
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