Method for high-speed optical fiber laser welding for pure titanium plate with thickness of 1mm

Abstract

The invention relates to a method for high-speed optical fiber laser welding for a pure titanium plate with a thickness of 1mm. The method is carried out according to the following steps: (1) a laserbeam is focused onto the surface of the pure titanium plate with the thickness of 1mm through an optical system in a welding head, and the pure titanium plate absorbs laser and then is melted to formwelding joints; (2) the welding head is connected with argon gas provided by a joint-row protection gas pipe and a back surface protection gas chamber to protect the welding joints formed after melting; (3) the welding head is moved to weld the pure titanium plate; and (4) the diameters of the transmission optical fibers of the laser beam output by a laser device are 100[mu]m, the welding head forms an angle of 60-75 degrees with the horizontal direction, the focused spots of the laser beam output by the welding head are located at a +9mm position on the surface of the pure titanium plate withthe thickness of 1mm, the welding head is paraxially connected with the four-joint-row protection gas pipe to protect the welding joint in the front surface, the back surface protection gas chamber protects the welding joint in the back surface, until the whole welding process is concluded, so that welding with a speed of 9m / min, for the pure titanium plate with the thickness of 1mm, is realized,and the welding front surface and back surface are spatter-free after welding. The method disclosed by the invention is capable of effectively avoiding the spatter generated in the welding process; and meanwhile, the protective gas effectively prevents the welding joints from being oxidized, so that the welding quality and the product stability are guaranteed, the rejection rate is lowered, and the welding speed for the pure titanium plate with the thickness of 1mm is increased.

Description

technical field [0001] The invention relates to a method for high-speed optical fiber laser welding of 1mm pure titanium plate, in particular to a method for high-speed optical fiber laser welding of 1mm pure titanium plate without oxidation and spatter. Background technique [0002] At present, the welding of 1mm pure titanium plate mainly adopts argon tungsten arc welding and fiber laser welding. The main problems in traditional argon tungsten arc welding are: low welding speed (about 0.5m / min); large welding heat input As a result, the deformation of the material after welding is too large to be used directly; the sample after welding needs to be processed, which increases the man-hour and reduces the yield. The main problems in general fiber laser welding are: spatter generated during the welding process, the weld seam is easy to oxidize, the welding speed can reach a maximum of 4.5m / min, and the speed cannot continue to increase. In order to ensure the welding quality ...

AI Technical Summary

Problems solved by technology

[0002] At present, the welding of 1mm pure titanium plate mainly adopts argon tungsten arc welding and fiber laser welding. The main problems in traditional argon tungsten arc welding are: low welding speed (about 0.5m / min); large welding heat input As a result, the deformation of the material after welding is large and cannot be used directly; the sample after welding needs to be processed, which increases the working hours and reduces the yield

The main problems in general fiber laser welding are: spatter generated during the welding process, the weld seam is easy to oxidize, the maximum welding speed can reach 4.5m / min, and the speed cannot continue to increase

In order to ensure welding quality and improve welding efficiency, none of the above methods can meet the welding requirements of 1mm pure titanium plate

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