A plasma-submerged arc hybrid welding system and its welding method

Abstract

The invention aims at providing a plasma-submerged arc hybrid welding system and a welding method thereof. The system comprises a plasma arc power supply, a submerged arc welding power supply, a plasma welding gun and a submerged arc welding gun. A negative electrode of the plasma arc power supply is connected with the plasma welding gun. A positive electrode of the plasma arc power supply is connected with a high-frequency arc starter which is connected with a workpiece. A positive electrode of the submerged arc welding power supply is connected with the submerged arc welding gun provided with a wire feeder. A negative electrode of the submerged arc welding power supply is connected with the workpiece. The plasma arc power supply and the submerged arc welding power supply are connected with a control device. The axis of the plasma welding gun is perpendicular to the workpiece. The included angel between the axis of the submerged arc welding gun and the axis of the plasma welding gun is 15-75 degrees. A water cooling copper partitioning plate is arranged between the submerged arc welding gun and the plasma welding gun. A small hole effect is formed in front of the plasma welding gun, so that deep penetration welding is carried out, and welding heat input amount is lowered. The submerged arc welding gun at the back portion enables filling metal to be fully molten through a consumable electrode arc, and welding quality is guaranteed.

Description

technical field [0001] The invention relates to a welding device and a welding method. Background technique [0002] As the manufacturing industry continues to increase welding efficiency and improve welding quality, it is essential to continuously improve and develop traditional arc welding processes and equipment. In order to improve welding efficiency and improve product manufacturing quality, more and more welding workers at home and abroad are researching the welding process of composite heat source. Composite heat source is not a simple superposition of two single heat sources in terms of heat source structure, but a method of welding multiple heat sources or composite heat sources on the same or different side of the workpiece based on the characteristics and mechanism of a single heat source. In recent years, researchers from PHILIPS in the Netherlands have proposed plasma-MIG composite heat source technology, which combines molten inert gas shielded welding (MIG) w...

AI Technical Summary

Problems solved by technology

Although the laser submerged arc hybrid welding technology has outstanding advantages, there are still some unresolved problems. For example, although a partition is used to separate the flux from the laser, it is still difficult to avoid a small amount of flux entering the laser action area and reflecting the laser beam. On the one hand, it significantly reduces the welding penetration, and on the other hand, it is easy to form hole defects on the weld, which makes it difficult to guarantee the welding quality and reduces the welding production efficiency.

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