Welding gun head for inner hole of sharp quenching heat exchanger

Abstract

The invention discloses a welding gun head for the inner hole of a sharp quenching heat exchanger. The welding gun head comprises a stainless steel guide pipe, an insulator, a guide nozzle fixing seat, a welding wire guiding nozzle, a welding wire, a water cooling circulation copper pipe, an argon gas protection gas pipe, an electrode wire, and a spray nozzle component provided with a tungsten electrode; the insulator is abutted against the stainless steel guide pipe and forms a hollow cavity; a copper seat is arranged in the inner cavity of the insulator, and one end of the copper seat is communicated with the exterior of the insulator; the guide nozzle fixing seat is arranged on the insulator and extends to the lower part of the insulator; the welding wire guide nozzle is fixed on the guide nozzle fixing seat, the welding wire penetrates through the welding wire guide nozzle and is welded with the tungsten electrode; one end of the water cooling circulation copper pipe, one end of the argon gas protecting gas pipe and one end of the electrode wire all penetrate through the inner cavity and are fixedly connected with the copper seat; and the spray nozzle component is in threaded connection with the copper seat. The welding gun head can extend to the interior of the inner pipe of the sharp quenching heat exchanger through the stainless steel guide pipe and an electrode wire for welding, and can effectively overcome the difficult problem that welding seams inside the inner pipe can not be welded; and the welding gun head has the characteristics of simple structure, convenience in operation and convenience in manufacture.

Description

technical field [0001] The invention relates to a welding device used in the welding of quenching heat exchanger equipment in the field of petrochemical industry, in particular to a welding device that extends into the inner tube of the ethylene quenching heat exchanger and performs inner hole welding on the welding seam of the inner tube of the quenching heat exchanger Welding gun head for the inner hole of the quenching heat exchanger. Background technique [0002] In the process of ethylene production, the process of cooling the cracked gas is a rapid cooling process. The high-temperature cracked gas (about 750-850°C) from the cracking furnace must be cooled rapidly in a very short time until the cracking reaction basically stops. Temperature (about 450-750°C). Otherwise, the polymer tar and coke generated by the secondary reaction of the cracked gas during the cooling process will be deposited on the tube wall, the heat transfer will deteriorate, the outlet temperature ...

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Problems solved by technology

[0005] However, due to the complex working conditions of the ethylene quenching heat exchanger in production, it must adapt to high temperature, high pressure, high quality and high flow rate. The above two structures have been used due to the large amount of welding, easy deformation and corrosion, stress concentration, and large temperature difference stress. Gradually withdraw from the market; now domestic and foreign are gradually transforming and researching the third-generation manufacturing method, that is, the welding of the inner pipe and the upper connector adopts inner hole welding, and then adopts the method of heat treatment in the furnace as a whole to ensure the quality of the whole equipment. But how to weld in the inner tube of the quenching heat exchanger has become a key breakthrough point

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