Welding method and welding system of tube-sheet butt joint structure

Abstract

The invention relates to the field of welding technology, in particular to a welding method and a welding system for a tube-sheet butt joint structure. The welding method includes: driving the welding torch to continuously perform welding along the girth weld in the girth weld of the tube-sheet butt joint structure, and during the continuous welding process, driving the welding torch between the groove side and the non-groove side of the girth weld According to this route multiple times of cross-movement. This method uses the moving route of the welding torch to realize the "8-stacked" moving route, thereby increasing the contact area between the molten pool metal and the base metal in the girth weld and the arc residence time, and offsetting the appearance of molten metal in the weld. The defect of dripping due to the influence of gravity, and can reasonably distribute the arc heat input according to the structural characteristics of the groove side and the non-groove side, fundamentally solve the molten pool dripping, which is easy to occur in the all-position welding of the tube-sheet butt joint structure Insufficient or excessive penetration and poor weld formation; this method can realize all-position continuous and uninterrupted welding of the tube-sheet butt joint structure.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding method and a welding system for a tube-sheet butt joint structure. Background technique [0002] The locomotive bogie frame is mostly made of medium-thick plate (thickness more than 8mm) beveled and welded. MAG welding refers to molten active gas shielded arc welding, and MAG welding is often used in the welding of frame structures to weld frames. Due to the actual situation of the frame structure, space location and technological equipment, there is a welding structure in which the pipe and the plate are butt jointed (referred to as the tube-sheet butt joint structure) during welding. Welding in the flat welding position, so fixed all-position welding must be used. [0003] The weld seams of fixed all-position welding include at least PE position, PD position, PF position, PB position, PA position and other welding positions, and different welding positions need to ...

AI Technical Summary

Problems solved by technology

[0010] The embodiment of the present invention provides a welding method and a welding system for a tube-sheet butt joint structure, which is used to solve the problem that the welding method and welding system in the prior art are affected by external forces during the welding process due to the weld droplet transition at different welding positions. , it is prone to various types of bad forming, which will cause adverse effects on the back weld formation and weld surface formation.

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