Automatic welding method for circumferential welding seam of round pipe

Abstract

The invention belongs to the field of pipe welding technology, and particularly relates to an automatic welding method for a circumferential welding seam of a round pipe. According to the method, the round pipe rotates relative to a welding gun in the welding process, and the welding position and welding angle of the welding gun in three-dimensional direction can be automatically adjusted so as to realize automatic welding of the circumferential welding seam. By adopting the welding method provided by the invention, the round pipe rotates relative to the welding gun in the welding process, and the welding position and welding angle of the welding gun in three-dimensional direction can be automatically adjusted, thus the welding position and the welding angle can be flexibly and accurately adjusted so as to automatically perform multi-layer multipass welding to form a circumferential welding with relatively good mechanical performance.

Description

technical field [0001] The invention belongs to the field of pipe fitting welding technology, and in particular relates to a multi-layer and multi-pass automatic welding method for the circumferential weld seam of a round pipe fitting. Background technique [0002] Truss structures are commonly used in public buildings such as large-span factories, exhibition halls, gymnasiums and bridges. Among them, some truss arms are formed by welding a circular tubular chord at both ends with ear hinges or supports, and the welds formed by the truss arms after welding are circumferential welds. Due to the stress characteristics of the truss structure, the circumferential welds formed after welding on the truss arms have high requirements in terms of connection strength and other mechanical properties. Therefore, the circumferential welds must be strong enough and have a certain cross-sectional size. The wall thickness and roundness of the pipe fittings, and the formed circumferential w...

AI Technical Summary

Problems solved by technology

The welding method described above is more difficult to operate for round pipes with large length and diameter dimensions and weight (such as chords)

Moreover, in common automatic welding machines, the degree of automation of various adjustment mechanisms for adjusting the welding position is insufficient, and many of them are manually adjusted, which is obviously difficult to meet the welding requirements of the above-mentioned multi-layer and multi-pass circumferential welds.

In addition, especially when several circumferential welds are welded on the same circular pipe at the same time, it also involves the synchronization of each weld.

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