Process parameter optimization method and system for porosity suppression in laser stir welding

Abstract

The invention belongs to the technical field related to laser welding, and discloses a process parameter optimization method and system for suppressing pores in laser stir welding. The method includes: S1, obtaining the backward chord length, forward chord length, forward step length and average The relationship between energy density and welding process parameters, the distance between the laser motion trajectory and the two adjacent intersection points of the weld center in the laser stir welding process is the chord length; S2, establish the backward chord length, forward chord length, forward step length and average The optimization constraints of energy density; S3, obtaining the preset range of process parameters; S4, substituting the process parameter values ​​within the preset range into the optimization constraints of backward chord length, forward chord length, forward step length and average energy density , then the process parameter combination that satisfies the optimization constraints of backward chord length, forward chord length, forward step length and average energy density at the same time is the optimized process parameter. This application optimizes the welding process parameters to achieve welding with large melting depth and few pores.

Description

technical field [0001] The invention belongs to the technical field related to laser welding, and more specifically, relates to a process parameter optimization method and system for pore suppression in laser stir welding. Background technique [0002] Aluminum alloy medium-thick-walled components have the advantages of low density and high specific strength, and have been widely used in rail transit, aerospace and other fields. Ultra-high power laser welding technology has the characteristics of high energy density, small heat input, and good flexibility. It provides an effective means for high-efficiency welding of aluminum alloys with medium and thick walls. However, the welding process has the problem of prominent porosity defects. [0003] In recent years, laser stir welding has been proposed as an emerging technology, which has attracted extensive attention from researchers at home and abroad. The principle of laser stir welding is: the laser beam is irradiated on two...

AI Technical Summary

Problems solved by technology

However, in the process of laser stir welding process parameter design, due to the stirring effect of the laser beam, the welding process parameters increase, and the welding process becomes more complicated. When designing such parameters, the design of process parameters is based on the general influence rules of relevant parameters, and a large number of process tests are required, which consumes a lot of manpower and material resources

In particular, in the welding of aluminum alloy medium and thick plates, there is a requirement for weld penetration. However, the current research shows that the effect of suppressing porosity is obvious when the stirring amplitude and frequency are increased, but the weld penetration is also greatly reduced, and the porosity and The opposite relationship between weld penetration further increases the difficulty of process design, greatly prolongs the process design cycle and reduces production efficiency

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