Welding temperature field control system and method

Abstract

The invention relates to a welding temperature field control system and method. The output end of the Dalin controller is connected to the welding power supply of the welding machine system, and the molten pool temperature measurement unit sends the detected molten pool data to the acquisition signal input end of the Dalin controller; The method is: divide the weld seam and heat-affected zone into three welding areas: high temperature, medium temperature, and low temperature; the molten pool temperature measurement unit obtains images of the thermal radiation field in two bands on the back of the welding area through a CCD camera; the collected thermal radiation The image of the field is filtered to obtain the corresponding relationship between gray value and temperature; the distribution of the entire welding temperature field is obtained using the above correspondence; the width of the isotherm is calculated, and the Dalin controller outputs the control value to the welding power supply of the welding machine system. The invention realizes closed-loop control of the isothermal line width on the back side of the weld seam and heat-affected zone, eliminates residual differences in automatic welding objects, improves production efficiency, saves costs, and achieves fast, accurate, and convenient detection and quality control.

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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