High-frequency electric furnace preheating device for welding thick-wall weldment with welding robot

Abstract

The invention relates to the technical field of thick-wall pressure container welding processing equipment and discloses a high-frequency electric furnace preheating device for welding a thick-wall weldment with a welding robot. The high-frequency electric furnace preheating device comprises an outer shell, an outer wire bundle, inner wires, multiple inner shells, inner shell positioning foot padsand high-frequency electromagnetic heating devices; the inner shells are vessels with downward openings and are installed in the outer shell; the high-frequency electromagnetic heating devices are installed in the inner shells respectively; the inner walls of the inner shells are attached to and fixedly connected with the outer surfaces of the high-frequency electromagnetic heating devices respectively; and the inner shell positioning foot pads are installed on the side edges of the openings of the inner shells respectively and are arranged below the inner shells respectively. The invention provides equipment for realizing preheating of a thick-wall weldment by adopting a high-frequency electric furnace principle to replace an acetylene flame to burn the weldment, the adverse effect on the quality of a welding seam of acetylene flame burning can be completely eradicated, the equipment can be used for local preheating and heat preservation of a welding seam area of the weldment, severeelectromagnetic interference cannot be caused to upper equipment under the constraint of a U-shaped magnetic core of the equipment, and the equipment can be used for working matching with a welding robot.

Description

[0001] Technical field: [0002] The invention relates to the technical field of welding processing equipment for thick-walled pressure vessels. [0003] Background technique: [0004] High-grade pressure vessels and pipelines have a wide range of industrial applications, especially in the chemical industry. Due to the pressure requirements of chemical processes, the lack of high-grade pressure vessels often means that production cannot be realized. [0005] In addition to the pressure resistance requirements, the high-grade pressure vessels used in the chemical industry also involve corrosion resistance and wear requirements. Therefore, it is necessary to reserve a large corrosion and wear allowance for the wall thickness of the vessel during design to ensure that the equipment is in the design life. Within the range, the compressive performance will not be lower than the process requirements due to corrosion and wear. In order to support the huge mass of thick-walled contain...

AI Technical Summary

Problems solved by technology

Since the acetylene flame directly burns the steel, a carbon black layer will be left on the steel surface, and if the carbon black layer is mixed into the welding pool, it will easily lead to weld defects, which must be avoided for high-grade pressure vessels and their auxiliary load-bearing structures , so the pre-hot spot of the weldment needs to be far away from the weld area, that is, the overall heating of the weldment will cause serious energy waste and cause high temperature in the production environment. When the automatic welding method of the welding robot is used, it will have thermal deformation of the welding robot. Processing positioning accuracy, in severe cases, will lead to bending and deformation of the welding robot frame. When the frame is long, the accumulated error will make the welding work impossible. In summer, it is easy to cause heatstroke of workers and endanger production safety.

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