Double-sided double-arc welding system and method for fine-diameter pipes based on k-tig

Abstract

The invention belongs to the field of welding technology, and discloses a K-TIG-based double-sided double-arc welding system and method for fine-diameter pipes. The insulating rod is installed inside the pipe to be welded, so that the tungsten electrode ring and the K-TIG welding torch are separately arranged on both sides of the butt joint of the pipe to be welded; when welding, the tungsten electrode ring is first in contact with the pipe to be welded, and the welding power source outputs the welding current to start the arc ; Then separate the tungsten electrode ring from the inner wall of the pipe to be welded, and ignite the arc; move the K-TIG welding torch in a circular motion along the butt joint of the pipe to be welded, and increase the welding current at the same time, and complete the welding after a circle. The invention combines the original K-TIG process with the double-sided double-arc perforation welding process, greatly reduces the perforation current, and reduces the deformation of the workpiece through the double-sided arc welding process; it has the advantages of low equipment operation cost and easy process conditions Realization, welding preparation time is short and so on.

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...

AI Technical Summary

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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