CN-121988870-A - Pneumatic follow-up laser welding gas protection device for corner structure

CN121988870ACN 121988870 ACN121988870 ACN 121988870ACN-121988870-A

Abstract

The invention belongs to the field of laser welding, and particularly relates to a gas shielded welding device with a straight welding seam structure and a corner welding seam structure at the same time at the position of a titanium alloy welding seam. A pneumatic follow-up laser welding gas protection device for a corner structure comprises a protection gas module, a pneumatic control module and a transverse blowing module, wherein the protection gas module comprises a front protection gas bin and a rear protection gas bin, the front protection gas bin and the rear protection gas bin are connected through a hinge, the inside of each bin is hollow, the bottoms of the two bins are filter discs, the protection gas is convenient to flow out, the pneumatic control module comprises a cylinder, a control part and a vacuum adsorption head, the cylinder controls the front protection gas bin and the rear protection gas bin to relatively rotate, the bottom of the vacuum adsorption head is in contact with a part, and the transverse blowing module comprises an adsorption force and a cylinder contraction power, wherein the adsorption force is used for providing the vacuum adsorption head. The invention has the advantages of realizing rapid laser welding under the atmospheric condition, improving the production efficiency and being applicable to space curved surface structures by using the object.

Inventors

ZHONG PEIXIN
XIAO XI
DENG SHAOPING
HUANG JIANGLONG
WEI NA
MAO PINGPING
PENG LIANGLIANG
CHEN ZHIQIANG

Assignees

江西洪都航空工业集团有限责任公司

Dates

Publication Date: 20260508
Application Date: 20260123

Claims (10)

1. A pneumatic follow-up laser welding gas protection device for a corner structure is characterized by comprising a protection gas module, a pneumatic control module and a transverse blowing module, wherein the protection gas module comprises a front protection gas bin and a rear protection gas bin, the front protection gas bin and the rear protection gas bin are connected through a hinge, the inside of each bin is hollow, the bottoms of the two bins are filter discs, the protection gas is convenient to flow out, the protection gas enters the front gas bin and the rear gas bin through gas inlets of the front protection gas bin and the rear protection gas bin respectively, the pneumatic control module comprises a cylinder, a control part and a vacuum adsorption head, the cylinder controls the front protection gas bin and the rear protection gas bin to rotate relatively, the bottom of the vacuum adsorption head is in contact with a part and can slide under the condition of being adsorbed on the surface of the part, the vacuum adsorption head is connected with the rear protection gas bin through the hinge, the control part is used for controlling the time and speed of shrinkage of the cylinder and the adsorption of the vacuum adsorption head and the part, and the transverse blowing module is used for providing adsorption force and cylinder shrinkage power of the vacuum adsorption head.
2. The gas protection device for pneumatic follower laser welding of corner structures of claim 1, wherein the shielding gas module further comprises a side blowing gas inlet disposed at the front end of the front shielding gas chamber for blowing away the vapor plume of the small hole orifice during laser welding.
3. The gas protection device for pneumatic follow-up laser welding of corner structures as set forth in claim 2, wherein a side-blowing protection gas nozzle is mounted on the side-blowing gas inlet, and the side-blowing protection gas nozzle is made of copper material for preventing burning loss caused by high-temperature metal vapor plume and reflected laser during welding.
4. The gas protection device for pneumatic follower laser welding of corner structure of claim 1, wherein the control part comprises an electromagnetic valve and a displacement sensor, one end of the electromagnetic valve is communicated with the vacuum adsorption head, the other end of the electromagnetic valve is communicated with the cylinder, and the displacement sensor is used for measuring the displacement of the cylinder and outputting a control signal to the electromagnetic valve.
5. The gas protection device for pneumatic follower laser welding of corner structure of claim 4, wherein a speed regulating valve is arranged between the electromagnetic valve and the cylinder for regulating the air flow speed of the cylinder when the cylinder is contracted by negative pressure, thereby controlling the contraction speed of the cylinder, the speed regulating valve is fixed outside the cylinder, an outlet of the speed regulating valve is connected with the cylinder, and an air inlet and an air outlet of the speed regulating valve are connected with the electromagnetic valve.
6. The gas protection device for pneumatic follower laser welding of corner structures of claim 1, wherein a return spring is mounted at the hinge connecting the vacuum suction head and the rear protection gas chamber, so that the hinge can be reset after rotation.
7. The pneumatic follow-up laser welding gas protection device for the corner structure of claim 1, wherein the transverse blowing module comprises an air knife and a vacuum generator, the air knife is communicated with the vacuum generator, high-speed air flow generated by the vacuum generator flows out through the air knife and is used for blowing away metal smoke dust in the laser welding process, and negative pressure generated by the vacuum generator provides the adsorption force of a vacuum adsorption head and the contraction power of a cylinder.
8. The gas-operated laser beam welding gas protection device for a corner structure according to claim 7, wherein the gas knife is connected with the vacuum generator through a telescopic pipe.
9. The gas protection device for pneumatic follow-up laser welding of corner structures according to claim 1, wherein hollow bolts are arranged at the gas inlets of the front protection gas bin and the rear protection gas bin, two ends of the cylinder are respectively sleeved on the hollow bolts of the gas inlets of the front protection gas bin and the rear protection gas bin, and the cylinder can rotate around the gas inlets of the front protection gas bin and the rear protection gas bin.
10. The gas-operated laser beam welding gas shield apparatus as set forth in claim 1, wherein flexible strip-shaped rubber sheets are adhered to both sides of said gas shield apparatus when the distance from the bottom of the gas cartridge to the surface of the part is most distant than 20 mm.

Description

Pneumatic follow-up laser welding gas protection device for corner structure Technical Field The invention belongs to the field of laser welding, and particularly relates to a gas shielded welding device with a straight welding seam structure and a corner welding seam structure at the same time at the position of a titanium alloy welding seam. Background With the high-speed development of aviation technology, titanium alloys are increasingly widely used in the aviation field. There are a large number of box-shaped parts in aircraft, and because of their hollow structure, machining is not possible, and the parts are usually joined and formed after machining. While a low cost, high efficiency joining technique is widely used in the manufacture of such parts. The laser welding technology is used as an advanced high-energy beam connecting technology, has the characteristics of high automation degree, small thermal deformation and the like, and is a common technology for connecting titanium alloy parts for aviation. However, titanium alloy is easily oxidized in the welding process, and the weld formation and the weld strength are seriously affected. Therefore, it is necessary to ensure that the titanium alloy in a high temperature state is isolated from oxygen and to prevent oxidation of the titanium alloy. Traditional titanium alloy welding is usually carried out in a vacuum argon filling bin, but a large amount of argon is required to be filled in the argon filling bin, the larger the part is, the larger the volume of the argon filling bin is, the higher the use cost is, and meanwhile, the automatic welding is not facilitated. When the laser welding is used, the follow-up protective towing cover can be adopted to isolate oxygen on the upper surface of the welding line so as to protect the welding line. The weld joint of a large box-shaped part is usually a spatial combination of a plurality of linear weld joints, and when the weld joint spans from one plane to the other plane when the corners between the two planes are large, the laser welding head needs to rotate at a large angle to finish continuous welding of the spatial weld joint. In continuous welding, the welding area needs to be protected at any time under argon atmosphere to prevent oxidation, but the existing follow-up protection device can integrally rotate along with a laser welding head, and the towing hood is farther and farther away from the welding line in the rotation process, so that effective protection of a space corner structure cannot be realized. Disclosure of Invention The invention aims to provide a pneumatic follow-up laser welding gas protection device for a corner structure, which is used for solving the problem that a welding line is difficult to protect in the laser welding process of a box-shaped titanium alloy part space corner structure. The pneumatic follow-up laser welding gas protection device for the corner structure comprises a protection gas module, a pneumatic control module and a transverse blowing module, wherein the protection gas module comprises a front protection gas bin and a rear protection gas bin which are connected through hinges, the inside of each of the front protection gas bin and the rear protection gas bin is hollow, filter discs are arranged at the bottoms of the front protection gas bin and the rear protection gas bin, the protection gas conveniently flows out, the protection gas respectively enters the front gas bin and the rear gas bin through gas inlets of the front protection gas bin and the rear protection gas bin, the pneumatic control module comprises a cylinder, a control part and a vacuum adsorption head, the cylinder controls the front protection gas bin and the rear protection gas bin to relatively rotate, the bottom of the vacuum adsorption head is in contact with a part and can slide under the condition of being adsorbed on the surface of the part, the protection gas module is connected with the rear protection gas bin through hinges, the control part is used for controlling the time and speed of shrinkage of the cylinder and whether the vacuum adsorption head is adsorbed, and the transverse blowing module comprises an adsorption force and cylinder shrinkage power for providing the vacuum adsorption head. Preferably, the shielding gas module further comprises a side blowing gas inlet, wherein the side blowing gas inlet is arranged at the front end of the front shielding gas bin and is used for blowing off the steam plume of the small hole opening in the laser welding process. Preferably, a side-blowing protection gas nozzle is arranged on the side-blowing gas inlet, and the side-blowing protection gas nozzle is made of copper material and is used for preventing burning loss caused by high-temperature metal vapor plume and reflected laser in the welding process. Preferably, the control part comprises an electromagnetic valve and a displacement sensor, wherein one end of the electromagnetic