Dual-laser beam hybrid welding device and hybrid welding method

Abstract

The invention provides a dual-laser beam hybrid welding device and a hybrid welding method. The dual-laser beam hybrid welding device comprises an ND: YAG (Neodymium-Doped Yttrium Aluminum Garnet) laser beam light path, and a dual-laser beam light path which is provided with a semiconductor laser beam light path and is arranged on a vertical dual-laser beam lens cone body. The dual-laser beam light path is provided with an ND: YAG total reflection lens, a semiconductor total reflection and ND: YAG total transmission combined lens, and a semiconductor and ND: YAG total transmission gathering lens in sequence from top to bottom. According to the invention, the high-freedom degree welding machining can be realized; the structure of the dual-laser beam hybrid welding device is simple and small; the alignment position is more accurate; and the automation is easy to realize. The dual-laser beam hybrid welding device can be used for welding positions which cannot be welded in a conventional manner, and a high-reflection and high-thermal conductivity material which cannot be welded by single laser, so that the application field of laser welding is enlarged, particularly a working piece is pre-heated by using a continuous semiconductor laser. The absorption efficiency of a material of the working piece to ND: YAG laser is improved, the welding fusion depth is increased, the welding speed and the welding efficiency are improved, and the occurrence of air vents and cracks in the welding process of working pieces is avoided.

Description

technical field [0001] The invention relates to laser welding, in particular to a dual laser beam composite welding device and a composite welding method. Background technique [0002] Commonly used single laser beam welding, for example, connects the continuous single-wavelength beam generated by the yttrium aluminum garnet crystal rod (ND:YAG) using neodymium (ND) as the excitation element to the laser processing head through a flexible optical fiber. The laser welding spot is small, The position of the weldment is required to be very precise, and it must be within the focus range of the laser beam, and the requirements for the base metal welding end face interface are high, otherwise, misalignment and welding discontinuity will easily occur. Due to the low absorption efficiency and energy conversion efficiency of metal materials for YAG laser with a wavelength of 1.06 μm at room temperature, the welding penetration is relatively low and the welding speed is relatively slo...

AI Technical Summary

Problems solved by technology

Due to the low absorption efficiency and energy conversion efficiency of metal materials for YAG laser with a wavelength of 1.06 μm at room temperature, the welding penetration is relatively low and the welding speed is relatively slow, which will easily lead to pores and embrittlement of the workpiece during the welding process, that is, welding cracks , especially for high reflectivity and high thermal conductivity materials such as aluminum, copper and their alloy welding is more difficult

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