Laser welding clamp and protecting device for titanium alloy thin-walled workpiece in shape of complex space

Abstract

The invention relates to a laser welding clamp and a protecting device for a titanium alloy thin-walled workpiece in a shape of a complex space. The laser welding clamp and the protecting device comprise a clamp, a gas protecting device and a lower supporting base. The clamp is a back contact pattern. The outer surface of the back contact pattern is matched with the inner surface of a welding piece. A first workpiece to be welded and a second workpiece to be welded are fixed on the clamp through a plurality of pressing plates. A seam to be welded between the first workpiece to be welded and the second workpiece to be welded is right opposite to a vent groove on the back contact pattern. The gas protecting device comprises a protecting lateral plate, a flexible copper cover and a lower sealing plate. The protecting lateral plate, the flexible copper cover and the lower sealing plate form a sealed cavity on the periphery of a welded workpiece. A back vent pipe is arranged in the vent groove, and a front vent pipe is arranged between the flexible copper cover and the welded piece. The flexible copper cover can move along a preset track under the driving of a laser head, and sealing protection of a whole welding process can be achieved. The laser welding clamp and the protecting device solves the problem of being long in a machining period of the clamp through numerical control machining, high in cost and hard in achieving of gas protection of the welding seam of a complex track.

Description

【Technical field】 [0001] The invention belongs to the field of welding fixtures and protective devices, and is particularly aimed at thin-walled titanium alloy parts with complex spatial shapes, easy deformation and oxidation during welding. 【Background technique】 [0002] In the medical, aerospace, automotive and other fields, in order to meet the requirements of beautiful appearance and streamlined shape, thin-walled parts with complex spatial shapes are often involved. For some larger and complex components, it is difficult to form the whole at one time, and it needs to be manufactured in sections and then welded into a whole. These thin-walled parts have poor rigidity and are easily deformed during the welding process. For precision welding such as laser welding, they are very sensitive to the deviation of the weld position, so it is necessary to use a suitable welding fixture for positioning to ensure the overall size. At present, the commonly used method is to use CAD...

AI Technical Summary

Problems solved by technology

However, these protection devices are only designed for straight line welds or circular welds, but for titanium alloy components with complex shapes, the curvature of the weld space changes greatly. There is a "gas protection dead zone" in all guns, a

Images