Method and device for monitoring inner wall temperature during surfacing of non-melting polar electric arc cylinder

Abstract

The invention discloses a method and device for monitoring the inner wall temperature during surfacing of a non-melting polar electric arc cylinder. The device comprises a positioner, the cylinder, awelding gun, a wire feeding mechanism, an infrared temperature sensor, a temperature collector, a temperature control instrument, a computer, a robot control cabinet and the like. According to the detection method, a non-contact infrared temperature sensing mode is adopted, the back surface temperature of the inner wall of the cylinder perpendicular to the welding gun during welding is collected,the dynamic change curve of the temperature is recorded and displayed on the computer, the difference value between the detection temperature and the preset temperature is monitored in real time afterone weld seam is completed, when the difference value is greater than a preset value, the computer communicates with the robot control cabinet through the temperature collector and the temperature control instrument, welding parameters are adjusted, and the consistent fusion depth of a surfacing interface is ensured. According to the method and device, the width of the fusion depth of surfacing layers can be controlled to be consistent, the proportion of substrate melting can be effectively decreased, the uniform performance of the weld seam is ensured, formation of defects such as pores andcracks is reduced, and the welding quality of a surfacing joint is improved.

Description

technical field [0001] The invention belongs to the technical field of arc surfacing welding, and relates to a method and device for monitoring inner wall temperature during surfacing welding of non-melting electrode arc cylinders. Background technique [0002] During the continuous deposition of arc surfacing on the cylinder, due to the accumulation of heat input, the melting amount of the matrix will increase, and the temperature of the arc starting point and the heat dissipation conditions of each weld are different, resulting in the lateral structure of the surfacing layer. The uneven performance affects the forming quality. On the other hand, due to the difference in heat accumulation and heat dissipation conditions, arc surfacing cannot guarantee high manufacturing accuracy. However, if the value of the welding current can be adjusted according to the temperature of the inner wall after each weld is completed, the penetration width of the overlay welding interface can...

AI Technical Summary

Problems solved by technology

[0003] At present, there are few related technologies related to the detection and control of the arc surfacing process. The patented welding temperature detection device, welding machine and welding temperature calibration method (application number: 201310275348.7) discloses a temperature detection device and detection method for the workpiece to be welded. , the device cannot be applied to arc additive manufacturing, and cannot realize closed-loop control of the welding process. At the same time, the temperature measurement adopts a contact temperature sensing method, which will damage the parts to be welded during installation.

The patent circle circle plasma surfacing wear-resistant plate preheating and heat preservation device (application number: 201621116756.3) discloses a kind of preheating, temperature measurement and heat preservation device for cylindrical plasma surfacing heat-resistant plate, the device must ensure the surfacing The process is continuous, the accumulation of heat input cannot be controlled, and the structure is complex, and the stability of the temperature measurement method is poor

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