CN-117900775-B - Welding process for liquid outlet of tetrafluoro plate lining

CN117900775BCN 117900775 BCN117900775 BCN 117900775BCN-117900775-B

Abstract

The invention relates to the technical field of tetrafluoro plate lining processing, and discloses a welding process of a tetrafluoro plate lining liquid outlet, which comprises the following steps of S1, plate lining preparation, namely (1) removing impurities, namely thoroughly cleaning a storage tank needing lining, removing impurities and dirt on the inner wall, and ensuring the clean and smooth inner surface, and (2) spraying priming paint, namely the priming paint is the first step of the tetrafluoro lining process, and can fill red poria with a sow thistle and irregular surfaces. The welding process of the tetrafluoro plate lining liquid outlet adopts a welding method of lining back cover at the welding joint of the medium and small caliber tetrafluoro plate lining liquid outlet, has simple and easy welded joint assembly and strong operability, and adopts CO2 and Ar mixed gas M IG welding or FCAW semiautomatic welding to finish the filling of the bottom, thereby realizing beautiful weld formation, ensuring that the back of the weld is not easy to produce burning-through, collapse, oxidation and other defect quality, having high welding efficiency and stable and reliable weld quality, and being proved by practice, obviously reducing the welding cost and improving the welding efficiency.

Inventors

ZHANG YUGUANG
HAN SHAOBAO
LIANG WEIDONG
Feng Guanyu

Assignees

富凯罐箱服务(南通)有限公司

Dates

Publication Date: 20260505
Application Date: 20240305

Claims (4)

1. The welding process of the liquid outlet of the tetrafluoro plate lining is characterized by comprising the following steps of: S1, preparing a plate lining, namely (1) removing impurities, namely thoroughly cleaning a storage tank needing the lining, removing impurities and dirt on the inner wall, and ensuring the cleanness and smoothness of the inner surface; (2) The primer is sprayed, namely the primer is the first step of the tetrafluoro lining process, can fill red poria with black and irregular surfaces, and provides good adhesive force and protection, so that the final tetrafluoro coating adheres well; (3) Spraying tetrafluoro, which is the final step of the process and needs to be carried out under the condition of drying and ventilation, wherein the quality of the coating is related to the cleanliness of a storage tank, the quality of the primer and the adhesion factor of the coating; (4) Drying, namely drying the coated polytetrafluoroethylene to ensure that the coating is thoroughly dried by adopting a hot air drying mode to form a liquid outlet of a polytetrafluoroethylene plate lining; S2, pipe section cutting, namely cutting the pipe section by adopting a plasma cutting machine; S3, preparing a pipe orifice, namely polishing a groove by adopting an angle grinder, reserving 1mm on a single side of the V-shaped groove by 30 degrees and a blunt edge until the metal luster is exposed, and preferentially using the pipe orifice edge milling machine under the condition of conditional conditions in order to ensure the flatness of a cut; S4, manufacturing a gasket, namely manufacturing a bottom sealing gasket material by using a material which is the same as the material of the multiple layers, polishing the periphery into an arc bevel shape or a chamfer angle of 30 degrees, and milling a circle of micro arc-shaped concave grooves at the position corresponding to the 1/2 position downwards in the middle of the outer ring of the annular bottom sealing gasket in order to facilitate the effective formation of a stainless steel multiple layer welding pool on the inner wall; s5, assembling and welding by adopting three types of pipes of phi 325 multiplied by 5 (4+1), phi 426 multiplied by 5 (4+1) and phi 529 multiplied by 6 (4.5+1.5) as welding representatives; S6, assembling, namely aligning, aligning and rounding the pipe orifice by using an inner orifice, welding 2-4 hot-rolled equilateral angle steels at two ends of the pipe orifice, and adopting hot-rolled round steel, square steel or flat steel sporadic materials to replace according to field conditions, wherein the spot-welding mode adopts the same technological parameters as the formal welding mode; S7, backing welding, namely adopting mixed gas MIG of CO2 and Ar to automatically weld and fill, setting different current adjustment values according to different flat, vertical and overhead welding modes, wherein the welding mode is a direct current reverse welding method, namely that a pipeline is connected with a negative electrode, a welding gun is connected with a positive electrode, and a short circuit transition welding arc process with less splashing is adopted, so that almost no oxidation burning loss exists in the welding process; S8, filling welding, namely adopting CO2+Ar mixed gas protection or FCAW welding, wherein compared with the traditional welding rod arc welding, the FCAW welding has the advantages of large welding line forming coefficient, low splashing rate, smooth and gentle welding line, and can be completed with backing welding, so that the primary pass rate of a welded junction can be obviously improved, the passing rate of nondestructive detection is ensured, the baking temperature of the welding rod is 250 ℃, and the heat preservation time is 2 hours; S9, cover welding: the cover surface is welded by hand arc welding or FCAW welding, the excess height of the weld seam is 2-3 mm, the welding seam and the parent metal are required to be smooth in transition and attractive in molding.
2. The welding process of the liquid outlet of the tetrafluoro plate lining according to claim 1, wherein the height of the concave groove of the lining in the step S4 is not more than 1/3 of the thickness of the lining, and the pipe assembly in the step S4 performs spot welding on the lining before embedding the lining into the inner wall of the composite pipe and ensures that the spot welding position is consistent with the direction of the conveying medium in the pipe.
3. The welding process of the liquid outlet of the tetrafluoro plate lining according to claim 1, wherein the flatness required by the pipe assembly in the step S5 is less than or equal to 2mm, the gap between welded junctions is 3-4 mm, the misalignment is controlled within 2mm, and the flatness of the pipe is less than or equal to 5 degrees.
4. The welding process of the liquid outlet of the tetrafluoro plate lining according to claim 1, wherein in the step S7, the welding current is 110-130 a, the welding voltage is 19-21 v, the flow rate of the shielding gas is 15L/min, and the welding speed is 14-21 cm/min.

Description

Welding process for liquid outlet of tetrafluoro plate lining Technical Field The invention relates to the technical field of tetrafluoro plate lining processing, in particular to a welding process for a tetrafluoro plate lining liquid outlet. Background The tetrafluoro plate lining takes a common carbon steel pipe as a matrix and is lined with a thermoplastic plastic pipe with excellent chemical stability, and the tetrafluoro plate lining has the mechanical function of the steel pipe and the characteristics of corrosion resistance, scaling delay and difficult microorganism growth after being subjected to cold drawing compounding or rotational molding. At present, along with the progress of the preparation technology of the tetrafluoro plate lining and the popularization and use of novel materials, the materials are more and more widely applied in the aspect of liquid conveying, so the materials can be used as a liquid outlet, and the limitation of the diameter of a pipeline can not be welded from the inside, so the composite layer of the pipeline can not be welded thoroughly easily, the performance of the composite layer can not be exerted, the mechanical property of a joint is reduced, in addition, a novel etching point is formed because the inner composite layer can not be welded thoroughly, the service life of the pipeline is greatly reduced, and the bottleneck for restricting the popularization and use of the stainless steel composite pipe is formed. Therefore, a new welding process is needed for the small-caliber tetrafluoro plate lining to improve the processing efficiency of the pipe, and a welding process for the liquid outlet of the tetrafluoro plate lining is needed to solve the above problems. Disclosure of Invention (One) solving the technical problems Aiming at the defects of the prior art, the invention provides a welding process for a liquid outlet of a tetrafluoro plate lining, which has the advantages of improving the welding work efficiency and the like and solves the problem of poor welding work efficiency. (II) technical scheme In order to achieve the aim of improving the welding work efficiency, the invention provides the following technical scheme that the welding process of the liquid outlet of the tetrafluoro plate lining comprises the following steps: S1, preparing a plate lining, namely (1) removing impurities, namely thoroughly cleaning a storage tank needing the lining, removing impurities and dirt on the inner wall, and ensuring the cleanness and smoothness of the inner surface; (2) The primer is sprayed, namely the primer is the first step of the tetrafluoro lining process, can fill red poria with black and irregular surfaces, and provides good adhesive force and protection, so that the final tetrafluoro coating adheres well; (3) Spraying tetrafluoro, which is the final step of the process and needs to be carried out under the condition of drying and ventilation, wherein the quality of the coating is related to factors such as the cleanliness of a storage tank, the quality of a primer, the adhesion of the coating and the like; (4) Drying, namely drying the coated polytetrafluoroethylene to ensure that the coating is thoroughly dried by adopting a hot air drying mode to form a liquid outlet of a polytetrafluoroethylene plate lining; S2, pipe section cutting, namely cutting the pipe section by adopting a plasma cutting machine; S3, preparing a pipe orifice, namely polishing a groove by adopting an angle grinder, reserving 1mm on a single side of the V-shaped groove by 30 degrees and a blunt edge until the metal luster is exposed, and preferentially using the pipe orifice edge milling machine under the condition of conditional conditions in order to ensure the flatness of a cut; S4, manufacturing a gasket, namely manufacturing a bottom sealing gasket material by using a material which is the same as the material of the multiple layers, polishing the periphery into an arc bevel shape or a chamfer angle of 30 degrees, and milling a circle of micro arc-shaped concave grooves at the position corresponding to the 1/2 position downwards in the middle of the outer ring of the annular bottom sealing gasket in order to facilitate the effective formation of a stainless steel multiple layer welding pool on the inner wall; s5, assembling and welding by adopting three types of pipes of phi 325 multiplied by 5 (4+1), phi 426 multiplied by 5 (4+1) and phi 529 multiplied by 6 (4.5+1.5) as welding representatives; S6, assembling, namely aligning, aligning and rounding the pipe orifice by using an inner orifice, welding 2-4 hot-rolled equilateral angle steels at two ends of the pipe orifice, and adopting a spot welding mode to adopt the same technological parameters as the formal welding according to site conditions by adopting scattered materials such as hot-rolled round steel, square steel or flat steel; S7, backing welding, namely automatically welding and backing filling by adopting CO2+Ar mix