Control method and equipment for friction stir welding

Abstract

The embodiment of the invention provides a control method and equipment for friction stir welding and relates to a welding technology. The control method comprises the following steps that when a workpiece to be welded is assembled in place, under the constant amount of indentation, a stirring head is controlled to weld the workpiece to be welded; and after meeting a preset rule, under the constant pressure, the stirring head is controlled to weld the remaining part of the workpiece to be welded. The control device comprises a first control unit and a second control unit which are used for executing the corresponding steps in the control method. Under the constant amount of indentation, the stirring head is controlled to weld the workpiece to be welded, and after meeting a preset condition, the stirring head is controlled to weld the remaining part of the workpiece to be welded, so that the welding defects of back welding spreading, the excessive size of a lifting hook, fins and the like caused by the excessive amount of indentation caused by excessive constant pressure value are effectively overcome, the problem of lack of the effective weld penetration of a welding seam caused by the little amount of indentation caused by small constant pressure value is effectively solved, the weld seam quality is better improved, and the welding efficiency is further improved.

Description

technical field [0001] The invention relates to welding technology, in particular to a control method and equipment for friction stir welding. Background technique [0002] The welding forming principle of friction stir welding is to stir the welding area of ​​the workpiece to be welded by stirring, and to compact the plastic metal under a certain pressure through the shaft shoulder, and finally form a dense weld seam; because friction stir welding has fast welding speed, The welding quality is stable, the residual stress and deformation of the workpiece are small, there is no pollution, the consumption of consumables is small, and the dependence on environmental temperature and humidity is small. There are more and more applications in it. [0003] At present, the common control method in friction stir welding is the constant pressure control method. The pressure value is preset before welding. During the welding process, the actual pressure value is detected in real time....

AI Technical Summary

Problems solved by technology

For the welded joint form and stirring head of the same structure, if the amount of the stirring head is too large, it is easy to cause welding defects such as back welding, excessive hook size, flashing, etc.; if the amount of stirring head is too small, it is easy to cause The effective penetration of the weld is not enough, so only when the indentation is kept constant, can a qualified weld be welded

However, due to the differences in the structure of the base metal and the assembly state, in order to ensure a constant pressure, the amount of indentation is bound to change, which leads to poor welding quality

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