Variable-focus laser welding equipment, blowing protecting device thereof and blowing protecting method

Abstract

The invention is applicable to the technical field of laser welding, and discloses a variable-focus laser welding blowing protecting method, a variable-focus laser welding blowing protecting device and variable-focus laser welding equipment with the blowing protecting device. The variable-focus laser welding blowing protecting device is arranged on a side with a focusing lens of a variable-focus laser welding head, is used for restraining smoke and plasmas from flying towards the side with the focusing lens in a variable-focus laser welding process and comprises a connecting support, an exhaust pipe and a gas supplying component for delivering gas to the inside of the exhaust pipe; the exhaust pipe is provided with a hollow inner cavity, a gas inlet and a plurality of exhaust holes; and the exhaust holes are formed in a wall surface, which backs on to the variable-focus laser welding head, of the exhaust pipe. The technical problem that smoke and plasmas which are generated when a variable-focus laser welding technology is applied to work pieces with complex surface structures such as sheet metal parts of a body in white of an automobile affect laser welding quality and welding efficiency greatly is solved.

Description

technical field [0001] The invention belongs to the technical field of laser welding, and in particular relates to an air blowing protection device for variable-focus laser welding, a method for blowing protection and variable-focus laser welding equipment with the air blowing protection device. Background technique [0002] Due to the advantages of high efficiency and superior performance, laser welding technology has been more and more widely used. A large amount of smoke and plasma will be generated during laser welding, and because the smoke and plasma absorb, refract and scatter the incident laser light, the smoke and plasma weaken the energy projected by the laser onto the surface of the workpiece, and even expand The spot of the laser beam will reduce the welding quality and welding efficiency of the workpiece. [0003] In order to prevent the smoke and plasma from weakening the energy projected by the laser on the surface of the workpiece, relevant technical personn...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art above, and provide a blowing protection device for variable-focus laser welding, a blowing protection method and a variable-focus laser welding device with the blowing protection device, which aims to solve the existing problems. There is a technical problem that the fume and plasma generated when the laser variable focus welding technology is applied to sheet metal workpieces such as automobile bodies with complex surface structures have a great impact on the quality and efficiency of laser welding

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