K-TIG-based thin-caliber pipeline double-sided double-arc welding system and method

Abstract

The invention belongs to the technical field of welding and discloses a K-TIG-based thin-caliber pipeline double-sided double-arc welding system and method. A negative electrode of a welding machine power source is connected with a K-TIG welding gun, and a positive electrode of the welding machine power source is connected with a tungsten electrode ring; the tungsten electrode ring is disposed ina to-be-welded pipeline through an insulating rod; the tungsten electrode ring and the K-TIG welding gun are disposed on the two sides of a butt joint seam of the to-be-welded pipeline correspondingly; during welding, the tungsten electrode ring makes contact with the to-be-welded pipeline, the welding machine power source outputs welding current for arc striking; then the tungsten electrode ringis separated from the inner wall of the to-be-welded pipeline, and electric arcs are ignited; and the K-TIG welding gun is driven to perform circular motion along the butt joint seam of the to-be-welded pipeline, meanwhile the welding current is intensified, and welding is finished after circling by 360 degrees. According to the K-TIG-based thin-caliber pipeline double-sided double-arc welding system and method, an original K-TIG process and a double-sided double-arc perforating welding process are combined, the perforating current is reduced substantially, and the deformation degree of workpieces is lowered through a double-sided electric-arc welding process; and the advantages that the equipment operation cost is low, the process conditions are easy to achieve, and the welding preparation time is short are achieved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a K-TIG-based welding system and welding method. Background technique [0002] Pipeline transportation, as one of the five major transportation industries of railways, highways, sea transportation, civil aviation and long-distance pipelines, plays an important role in the construction of the national economy. The development of cities and industries requires the laying of a large number of pipes. At present, the pipeline network must be formed by welding, so it is particularly critical to ensure the welding quality of pipe joints. At present, due to the flexibility of manual welding and the low requirements for equipment, the welding of outdoor pipelines is still dominated by manual welding, which is characterized by high efficiency and high adaptability to the environment. [0003] K-TIG (keyhole high-efficiency penetration argon arc welding torch) is a new perforation weldin...

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Problems solved by technology

[0004] The present invention aims to solve the technical problem that the stability of small holes in K-TIG welding deteriorates as the thermal conductivity of the workpiece increases, and provides a K-TIG-based double-sided double-arc welding system and method for fine-diameter pipes. Combining the original K-TIG process with the double-sided double-arc piercing welding process, the piercing current is greatly reduced, and the deformation of the workpiece is reduced through the double-sided arc welding process; it has low equipment operating costs, easy to achieve process conditions, Advantages such as short welding preparation time

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