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

Abstract

The invention belongs to the field of welding technology, and discloses a K-TIG-based wide-caliber pipe double-sided double-arc welding system and method. The negative electrode of the welding machine power supply is connected to the K-TIG welding torch, and the positive electrode is connected to the GTAW welding torch, and the two welding torches are opposite to each other. The ground is placed on both sides of the butt joint of the pipe to be welded; when welding, firstly output the arcing current of the welding power supply to ignite the double-sided arc, and then increase the welding power supply to the output welding current, and the two welding torches are respectively inside and outside the pipe to be welded at the same angular velocity Make a synchronous circular motion around the butt joint of the pipe to be welded to ensure that the welding current is perpendicular to the pipe wall and pass through the small hole weld. After the two welding torches circle around a circle synchronously, the welding of the pipe to be welded is completed. 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] In recent years, my country's demand for oil and natural gas has been increasing. Most of my country's oil and gas resources are distributed in the northeast and northwest regions, while the consumer market is mainly in the south-central and large and medium-sized cities along the southeast coast. It is necessary to lay a large number of oil and gas pipelines to solve production and sales. The problem of severe market segmentation. Due to the high design pressure and large transportation volume of oil and gas pipelines, large-diameter and thick-walled pipelines are generally used. Before welding, the nozzles of the two pipes to be welded must be aligned so that the paired nozzles can meet the roundness, misalignment and alignment gap required by the specification. In order to achieve fast and accurat...

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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 wide-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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