Control system and method for weld-forming of thin-walled pipe

Abstract

The invention discloses a control system and method for weld-forming of a thin-walled pipe. The control system comprises a welding tool used for weld-forming of the thin-walled pipe and a quality control device used for controlling the quality of longitudinal joints, welded by the welding tool, of the thin-walled pipe. The method comprises the following steps of 1, assembling the welding tool and the to-be-welded thin-walled pipe; 2, debugging the welding tool; 3, initializing the quality control device; 4, starting welding the to-be-welded thin-walled pipe; 5, acquiring real-time welding data of the thin-walled pipe; 6, judging whether the real-time welding data of the thin-walled pipe are abnormal or not; 7, judging whether the thin-walled pipe is defective or not; 8, judging whether the thin-walled pipe is deformed or not; and 9, carrying out stress relaxation on the thin-walled pipe. According to the control system and method for weld-forming the thin-walled pipe, the welding tool provides stable protective gas flow and double cooling measures for the to-be-welded thin-walled pipe, the welding quality of the to-be-welded thin-walled pipe is monitored in real time through the quality control device, so that the residual stress is eliminated, the fatigue life is prolonged, and the stress corrosion resistance is improved.

Description

technical field [0001] The invention belongs to the technical field of welding and forming of thin-walled pipe fittings, and in particular relates to a control system and method for welding and forming of thin-walled pipe fittings. Background technique [0002] Thin-walled metal materials have become the main materials for the manufacture of aerospace weapon equipment structures, and the welding deformation, weld formation and quality control of thin-walled structures have become the focus of research in the field of welding technology. Due to the characteristics of poor rigidity, low strength, easy deformation, and low manufacturing precision of thin-walled components, the shape accuracy of the outer welding position is poor, and the heat conduction is poor and unstable during the welding process, resulting in coarse grains and poor weld consistency. Materials, the protective airflow is uneven and easy to turbulent, causing weld surface pollution, unstable product quality, ...

AI Technical Summary

Problems solved by technology

Due to the characteristics of poor rigidity, low strength, easy deformation, and low manufacturing accuracy of thin-walled components, the shape accuracy of the outer welding position is poor, and the heat conduction is poor and unstable during the welding process, resulting in coarse grains and poor weld consistency. Material, the protective airflow is uneven and easy to turbulence, causing weld surface pollution, unstable product quality, and significant deformation after removing the welding tool when the welding stress is too large, resulting in structural dimensions that deviate from the design technical requirements, directly affecting components and even models The performance and quality of the product requires special welding and forming tooling or measures to ensure its butt joint gap, misalignment and shape accuracy

[0003] Welding residual stress affects the fatigue strength and fatigue life of the workpiece, and there are hidden dangers of stress corrosion in corrosive media

In engineering practice, the measurement of welding stress and strain is basically an offline test, which cannot be monitored and evaluated in real time during the welding process. At the same time, it has not made a positive contribution to the study of the stress and strain mechanism of the welding process and the mechanism of crack propagation caused by stress and strain.

The main method for actually eliminating stress in engineering is post-weld heat treatment, which to a certain extent loses the performance of the workpiece. Rare metal materials that are sensitive to temperature are easily contaminated by gas impurities, resulting in brittle joints or a significant decrease in corrosion resistance. Investment must be made Larger vacuum heat treatment furnace, at the same time, higher energy consumption leads to higher production costs

In addition, the existing welding crack detection mainly uses post-weld ultrasonic, magnetic measurement, X-ray and other non-destructive testing methods, which need to go through a long time and tedious inspection process and cannot provide real-time and accurate characteristic information

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