Penetration control method for active excitation of molten pool by single-beam or multi-beam array laser

Abstract

The invention relates to a fusion penetration control method of an active shock excitation molten pool of multiple array lasers. An electric arc heats a molten pool, the dimension of the molten pool is gradually increased; meanwhile, a laser beam splitter emits multiple array lasers which are irradiated on the molten pool and provided with impact force with a certain frequency for the molten pool; the impact force leads to the amplitude change of the molten pool and causes the change of arc length and arc voltage, and changing curve of the arc voltage is collected by an oscilloscope; when the natural mode shape of the motel pool is consistent with the acting frequency of the array laser, the molten pool generates resonance oscillation, and its amplitude is the biggest, the voltage change amplitude is also the biggest, and the molten pool is grown up to the predetermined dimension; a computer control system controls the fusion penetration of a welding line in real time according to the voltage changing amplitude. The array laser impulse frequency is 1-1000 Hz. Through the array laser frequency, dimension of the resonated molten pool is determined, namely, the dimension of the molten pool is controlled through selecting the array laser frequency, and thus the fusion penetration of the welding line is controlled. Compared with the existing molten pool shock excitation method, the fusion penetration control method is high in precision, and good in stability and repeatability.

Description

technical field [0001] The invention relates to a method for controlling penetration of a molten pool actively excited by multi-beam array lasers, and belongs to the fields of welding quality control and welding process automation. Background technique [0002] Penetration control is the focus and difficulty in realizing welding quality control and welding process automation, and the key to realizing penetration control is how to effectively obtain the signal representing the state of welding penetration. At present, many scholars have carried out relevant research on penetration signal detection. The main detection methods include welding temperature field detection, visual image detection, ultrasonic, arc sound detection and molten pool oscillation detection. Among them, there are many researches on the application of visual detection method and molten pool oscillation method. [0003] The molten pool oscillation method has attracted much attention because of the direct p...

AI Technical Summary

Problems solved by technology

The current research uses pulse current or variable frequency current to excite the molten pool. In this method, the arc force offset during walking welding leads to a decrease in the oscillation level of the molten pool, and due to the addition or superimposition of pulse or variable frequency current on the normal welding current , will have a certain influence on the welding process and welding process

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