Method and equipment for induction heating and welding

Abstract

The invention relates to an induction soldering method and its welding equipment in welding equipment welding. Welding equipment consists of pipe-welding machine and induction heater. The equipment can automatically weld pipe transforming liquid, raw petroleum, natural gas and medium in chemical industry, and has high use value in water resources and electric power department and petrochemical industry.

Description

technical field [0001] The invention relates to a solid-phase welding method and welding equipment, more precisely, to an induction heating welding method and welding equipment for butt welding of steel pipes. The welding method and welding equipment are used in water conservancy, electric power and petrochemical enterprises to automatically weld pipelines for transporting liquid, crude oil, natural gas and chemical media. technical background [0002] At present, the pipeline systems of water conservancy, electric power and petrochemical enterprises are developing in the direction of large diameter (greater than 1000mm) and thick wall (greater than 21mm). When the pipeline is installed and welded, since the steel pipe in the installation cannot be rotated, the welding of the butt weld of the steel pipe is fixed by the steel pipe, and the welding torch is welded by rotating around the outer circumference of the steel pipe. This welding method h...

AI Technical Summary

Problems solved by technology

In the overhead welding position, since the welding molten pool is at the lower part of the steel pipe, the molten steel tends to fall, and the weld seam is difficult to form, and most of the welding quality defects occur in this part, especially when the root weld is welded, the welding tool operation method Improper changes in welding process parameters will cause a variety of welding quality defects; due to the wall thickness of the steel pipe, the welding layer of the pipe will increase, the number of welding layers will increase, the heating time of the welding joint will be long, the thermal deformation will increase, and the welding internal stress will increase; and , due to the long circumference of the steel pipe, it takes a long time to weld a layer of seam

[0003] Due to the above reasons, in order to ensure the welding quality, especially the welding quality of the overhead welding position, only the complex structure and expensive foreign "automatic root welding machine" can be used to weld the bottom of the weld seam, and the pipeline automatic welding machine or semi-automatic welding torch can be used to fill the weld seam welding and cover welding

With this welding method: it is necessary to purchase foreign "automatic root welding machines" with complex structures and expensive prices for root weld welding.

Although the funds for the purchase of welding equipment have been increased, it only solves the technical problems caused by the single-side welding and double-side forming all-position welding process, but cannot minimize the welding time; The thermal deformation is large and the welding internal stress is large; it not only affects the safe use of the pipeline, but also increases the welding workload and labor intensity of the welding workers, as well as the pipeline installation period

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