Automatically controlled direct current degaussing device and method

Abstract

The invention belongs to the technical field of degaussing, and relates to an automatically controlled direct current degaussing device and method for eliminating a welding seam magnetic field in the butt welding process of large steel plates in the industrial production. In the degaussing device, a pair of degaussing heads (1) are movably arranged at the front end of a welding machine, are symmetrically arranged at the two sides of a to-be-welded edge seam, and are connected with a positive electrode and a negative electrode of a programmable power supply (2), and the programmable power supply (2) supplies power through commercial power, so that a direct-current strong magnetic field is generated between the two demagnetizing heads (1). A Gauss meter (3) is connected with a PLC (4) through a serial port and is used for collecting the magnetic field data of the to-be-welded edge seam and transmitting the magnetic field data to the PLC (4), the PLC (4) controls the programmable power supply (2) to output a current through the program operation to enable the demagnetizing heads (1) to generate a needed demagnetizing magnetic field, the magnetic field of the welding seam (6) of a steel plate (5) is counteracted before welding, and therefore it is guaranteed that the magnetic field at the welding seam of the large steel plate meets the set requirement. The degaussing device is easy to operate and is suitable for the automatic control over the magnetic field in the large steel plate butt welding process.

Description

technical field [0001] The invention belongs to the technical field of degaussing, and in particular relates to an automatic control DC degaussing device and method for eliminating the strong magnetic field of butt weld seams of large steel plates in the industrial welding process. Background technique [0002] In the process of steel plate processing and welding, because the steel plate will inevitably be exposed to large current and magnetic field, resulting in a certain residual magnetic field on the surface of the steel plate, when the size of the steel plate is large or the steel plate is exposed to a strong magnetic field, the weld Stitching will generate a strong magnetic field of more than 50Gs, which may reach 200-300Gs in actual working conditions, causing the welding arc to shift, affecting the welding quality, and thus affecting the welding of large-scale steel plates. Existing degaussing devices mainly use an alternating magnetic field to continuously change the...

AI Technical Summary

Problems solved by technology

For example, Chinese utility model patent ZL200920147276.7 proposes "a degaussing device for workpieces". connected to generate an alternating magnetic field. This device mainly uses AC magnetic field degaussing, which is suitable for steel plates with small coercive force. When the coercive force is greater than 100Gs, AC demagnetization is difficult, and it is difficult to meet the actual steel plate welding requirements. Usually, the steel plate needs to be It is placed in the coil of the device, resulting in a large volume and complex structure, which is inconvenient to carry and carry, and is not suitable for field construction. At the same time, the size of the demagnetized parts is affected by the internal space of the degaussing equipment, so it cannot be used for large-scale welding after on-site welding. Degaussing the tablet

Images