Welding temperature field control system and method

Abstract

The invention relates to a welding temperature field control system and method. The output end of a Dahlin controller is connected with a welding power supply of a welding machine system, and a welding pool temperature measuring unit transmits detected welding pool data to the collected signal input end of the Dahlin controller. The method includes the steps that a welding line and heat effect zone is divided into a high-temperature welding zone, a medium-temperature welding zone and a low-temperature welding zone; the welding pool temperature measuring unit acquires an image of a heat radiation field of two wave bands on the back sides of the welding zones through a CCD camera; filtering processing is performed on the collected image of the heat radiation field to obtain the corresponding relation between the grey level and temperature; distribution of the whole welding field temperature is obtained according to the corresponding relation; and the width of an isotherm is calculated, and the Dahlin controller outputs a control value to the welding power supply of the welding machine system. By means of the method, closed-loop control over the width of the isotherm of the back side of the welding line and heat effect zone is achieved, residual errors in automatic welding objects are eliminated, production efficiency is improved, cost is lowered, and rapid, accurate and convenient detection and quality control are achieved.

Description

technical field [0001] The invention relates to the technical field of welding quality control, in particular to a welding temperature field control system and method. Background technique [0002] The research of welding process has gone deep into welding microscopic quality control from macroscopic process control. Like welding macroscopic quality control, the main difficulty of microscopic quality control is to obtain the sensing technology to characterize these microscopic quality. The distribution of welding temperature field determines the thermal cycle of welding, which also determines the welding microstructure and its changes, and determines the macroscopic performance of the weld and its heat-affected zone. Therefore, the real-time detection of welding temperature field and the extraction of thermal cycle parameters It is of great significance to realize the microscopic quality control of welding. [0003] The welding temperature field is the basic characterizatio...

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Problems solved by technology

[0005] Aiming at the shortcomings in the prior art that it is very difficult to ensure the consistency of weld penetration only by relying on the stability of welding specifications in the welding process, the technical problem to be solved by the present invention is to provide a fast response that can control the welding temperature field and welding temperature. Welding temperature field control system and method for real-time detection and control of quality

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