Large thick plate welding method and system based on double strip-shaped welding wires

Abstract

The invention provides a large thick plate welding method and system based on double strip-shaped welding wires. The method works on the basis of the double-welding-wire arc welding principle. In the welding process of a large thick plate, a welding bead layer is divided into backing welding, filling welding and cosmetic welding; and according to the characteristics of different welding bead layers, size selection and arrangement are carried out on the strip-shaped welding wires. The system comprises a double strip-shaped welding wire welding gun A, a double strip-shaped welding wire welding gun B and a welding control center. The double strip-shaped welding wire welding gun A is provided with two strip-shaped welding wires with the same width; the double strip-shaped welding wire welding gun B is provided with two strip-shaped welding wires with different widths; and the welding control center is used for presetting a welding program and controlling the double strip-shaped welding wire welding gun A and the double strip-shaped welding wire welding gun B to work according to the preset welding program. The preset welding program comprises selection of welding modes including a backing welding mode, a filling welding mode, a cosmetic welding mode I and a cosmetic welding mode II. By adopting the method and the system, high-efficiency and high-quality welding of large thick plates can be realized.

Description

Technical field[0001]The present invention provides a large sheet welding method based on a binding wire and its system, belonging to the field of welding processing.Background technique[0002]At present, a large thick plate welding method for a thickness of more than 40 mm is mainly MIG / MAG welding and narrow gap laser filling welding. The narrow gap laser filling welding has the advantages of high welding quality, stable, but the laser beam requires strict assembly gaps, and the metal surface is highly reflected in the laser, and the thermal efficiency is low in the molten tank, which is easy to generate a porous, bitten when welding Side defects. For large plate MIG / MAG welding, it is necessary to treat the solder tools, and the slope size is large, and the amount of filling is required to increase the welding, and the welding efficiency will be reduced.[0003]In order to solve the above problems, two wire MIG / MAG welding techniques are proposed. The two wires are passed thro...

AI Technical Summary

Problems solved by technology

However, ordinary twin-wire MIG / MAG welding is limited by the welding torch, and the groove size is large. Although the filling volume is larger than that of single-wire MIG / MAG welding, the welding efficiency is still not high due to the size of the welding wire, especially in the welding of large and thick plates.

Images