High-frequency induction welding device for steel pipe

Abstract

The invention discloses a high-frequency induction welding device for a steel pipe, and belongs to the technical field of high-frequency welding equipment. A vertical plate is arranged, an induction rod is arranged on the vertical plate, and an induction plate is arranged in an induction coil, so that the heating range is more concentrated, and the phenomena that a rolled steel strip is heated in advance when being far away from the induction coil, so that the heating time is too long, and the steel strip is perforated are avoided; a pre-cooling water pipe is arranged and is used for spraying cooling water with the low temperature, the rolled steel strip is cooled to a relatively-balanced temperature in advance, and the time for heating the steel strip by the induction coil is relatively consistent; a rear cooling water pipe is arranged and is used for spraying cooling water with the high temperature, the heated and welded steel pipe is cooled, and the cooling water with the high temperature can prevent the steel pipe from suddenly being cooled and shrunk; two sets of pressing roller mechanisms are arranged, the steel pipe is fixed through a plurality of extrusion wheels in the pressing roller mechanisms, and the steel pipe is prevented from being deformed in the cooling process.

Description

technical field [0001] The invention belongs to the technical field of high-frequency welding equipment, and in particular relates to a high-frequency induction welding device for steel pipes. Background technique [0002] High-frequency welding refers to a welding method that uses high-frequency current to flow through the resistance heat generated by the contact surface of the workpiece, and applies pressure (or no pressure) to form a connection between the workpiece metal. High frequency welding is different from resistance welding. During high-frequency welding, the welding current only touches the workpiece surface in parallel; the current of resistance welding flows perpendicular to the welding interface. [0003] The existing steel pipe high-frequency welding device generally extrudes the steel strip into a cylindrical shape through the roller shaft for welding, but during the welding process, due to the high-frequency heating process, the initial temperature of the ...

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Problems solved by technology

[0003] The existing steel pipe high-frequency welding device generally extrudes the steel strip into a cylindrical shape through the roller shaft for welding, but during the welding process, due to the high-frequency heating process, the initial temperature of the steel strip changes after extrusion , the heating time cannot be effectively controlled during the high-frequency heating process, and the roundness of the steel pipe after welding is easy to change when it is not cooled, resulting in changes in the size of the steel pipe, failing to achieve the required accuracy, and resulting in waste of materials

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