Double-sided double-arc piercing welding method based on k-tig

Abstract

The invention belongs to the field of welding technology, and discloses a K-TIG-based double-sided double-arc piercing welding method. In the method, the K-TIG welding torch and the GTAW welding torch are relatively placed on both sides of the butt seam of the weldment, and the K-TIG The TIG welding torch is connected to the negative pole of the welding machine power supply, and the GTAW welding torch is connected to the positive pole of the welding machine power supply. The K-TIG welding torch and the GTAW welding torch simultaneously weld the same position of the welded part, and the nozzle of the K-TIG welding torch is perpendicular to The welding position of the butt joint of the workpiece to be welded, so that the welding arc passes through the small hole of the weld. The invention combines the original K-TIG process with the double-sided double-arc perforation welding process to solve the problem that K-TIG welding can only perform stable perforation welding on workpieces with low thermal conductivity, greatly reduces the perforation current, and can also pass Double-sided arc welding process to reduce the degree of deformation of the workpiece.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a K-TIG-based welding method. Background technique [0002] K-TIG (keyhole high-efficiency penetration argon arc welding torch) is a new perforation welding process method based on traditional TIG welding torch, which produces cathode shrinkage effect through water-cooled tungsten electrode and cooperates with large welding current. A large number of process tests have proved that the K-TIG welding process is suitable for welding metal materials with low thermal conductivity, but due to the low average energy density of the free arc used, the stability of the small hole deteriorates with the increase of the thermal conductivity of the workpiece. When welding medium and thick plates, the degree of arc shrinkage is not enough, which is not conducive to the formation of stable penetration holes, so the process window for K-TIG welding process to obtain qualified welds is small. Th...

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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 with the increase of the thermal conductivity of the workpiece. It provides a K-TIG-based double-sided double-arc perforation welding method. The combination of K-TIG process and double-sided double-arc piercing welding process greatly reduces the piercing current, enhances the stability of the small hole and expands the process window, while reducing the deformation of the workpiece

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