CN-115889965-B - Method for repairing crack defect of aluminum alloy test piece by using tip sheet sonotrode

Abstract

A method for repairing crack defects of an aluminum alloy test piece by using a tip sheet sonotrode belongs to the field of aluminum alloy test piece repair and comprises (1) determining crack repair requirements of the aluminum alloy test piece according to the use environment of the aluminum alloy test piece and determining required welding flux according to the repair requirements; the method comprises the steps of (1) carrying out ultrasonic cleaning on the inside of a crack, (3) carrying out ultrasonic repair on the part to be repaired, firstly, placing a test piece on a heating platform for heating, placing welding flux into the crack after the test piece is heated to a specified temperature, extending a tip sheet sonotrode into the welding flux after the welding flux is completely melted, starting ultrasonic for repair, and (4) carrying out test on the structure and performance of a welded joint after the repair is finished. The repairing method has strong operability, the repairing process under the action of ultrasonic waves can be directly carried out in the atmospheric environment, no protective gas or special environment is needed, the repairing cost is reduced, and the repairing method can be suitable for cracks with various complex shapes, small width and large depth.

Inventors

• LI DACHENG
• MEI MIN
• DUAN QIONG
• ZHANG BINGYU

Assignees

• 哈尔滨普瑞斯材料科技有限公司

Dates

Publication Date

20260505

Application Date

20221229

Claims (1)

1. 1. A method for repairing crack defects of an aluminum alloy test piece by using a tip sheet sonotrode, which is characterized by comprising the following steps: (1) Determining crack repair requirements of the aluminum alloy test piece according to the use environment of the aluminum alloy test piece, and determining required welding flux according to the repair requirements; (2) Ultrasonic cleaning is carried out on the inside of the crack; When the crack depth is more than or equal to 1/2 of the thickness of the test piece, the amplitude is selected to be 20-100 mu m, the ultrasonic time is more than or equal to 20 s, and when the crack depth is less than 1/2 of the thickness of the test piece, the amplitude is selected to be 10-50 mu m, and the ultrasonic time is less than 20 s; (3) Performing ultrasonic repair on the crack to be repaired; Firstly, placing a test piece on a heating platform for heating, placing solder in a crack after the test piece is heated to a specified temperature, and after the solder is completely melted, extending a tip sheet sonotrode into the solder, starting ultrasonic waves for repairing, wherein the tip sheet sonotrode is made of TC4 titanium alloy and is divided into an upper part and a lower part, the upper part is a cylinder, the diameter of the cylinder is 18-20mm, the height of the cylinder is 30-80mm, the lower part is tip-shaped, the height of the cylinder is 30-100mm, the thickness of the most tip part is 0.1-0.5 mm, the theta angle of the tip is 1-20 degrees, the frequency of the ultrasonic waves is 15-60kHz, the amplitude of the ultrasonic waves is 10-30 mu m, the power is 300-2000W, the ultrasonic time is 1-100s, and the heating temperature is 200-700 ℃; (4) After the repair is finished, the structure and performance of the weld are tested.

Description

Method for repairing crack defect of aluminum alloy test piece by using tip sheet sonotrode Technical Field The invention belongs to the field of aluminum alloy test piece repair, and particularly relates to a method for repairing crack defects of an aluminum alloy test piece by using a tip sheet sonotrode. Background Lightweight is one of the main trends in the manufacturing industry today, so lightweight aluminum alloy test pieces are increasingly used. However, the aluminum alloy test piece often has defects such as fatigue cracks and corrosion cracks in the use process, and particularly, if the aluminum alloy test piece has a welded joint, the welded area is a position where the defects are very easy to occur. If the defective test piece is directly replaced, unnecessary waste is caused, and the manufacturing cost is greatly increased. Therefore, it is necessary to repair the crack defect. At present, many methods for repairing crack defects are available, and the methods adopted are various. Patent 202022744633.7 discloses a laser cladding equipment convenient to repair crackle, and this equipment can realize the automation mechanized operation of laser cladding body, makes the laser cladding body can carry out corresponding motion, and can long-range whole laser cladding equipment control, makes things convenient for operating personnel's use. The patent 202122443007.9 discloses a collection and transportation pipeline repair crack fills welding set, through the cooperation of installation piece and mounting groove, can make welder place board and welder round the outer wall of pipeline and remove, and operating personnel just can accomplish the filling welding work of crack through removing the installation piece and using the welder, reduces operating personnel's work load and intensity of labour, improves the operating efficiency. The patent 202110795589.9 discloses an epoxy potting electronic component capable of repairing cracks in situ and realizing nondestructive disassembly, and the main component of the method is epoxy potting adhesive, which consists of epoxy resin, an epoxy curing agent, an epoxy diluent, inorganic filler and a catalyst. Crack repair can be realized below 150 ℃ and disassembly can be realized below 100 ℃, and the electronic components encapsulated by the crack repair can realize in-situ repair of cracks and nondestructive disassembly of components. Patent 201710123487.6 discloses a method for repairing defects of thermoplastic composite materials in situ by utilizing ultrasonic heat, which uses driving force generated by ultrasonic waves to drive fluid outside a gap to fill the gap, so that a homogeneous resin material can be filled into a local layering region of the composite material, and repair of layering defects is realized. The repairing process can reduce the repairing temperature, avoid the problems of overheat oxidation and the like of materials, and improve the repairing efficiency. Patent 202111306009.1 discloses a laser cladding method for repairing surface cracks of shaft parts, which is only aimed at cracks with the depth of not more than 500 micrometers. The method comprises repairing cracks of shaft parts with crack depth not exceeding 100 micrometers by pulse current discharge method, repairing shaft parts with crack depth between 100 micrometers and 500 micrometers by laser cladding method, and applying ultrasonic vibration to cladding layer during cladding. Patent 201610956707.9 discloses a three-dimensional brazing repair material for a hot end part of an engine and a preparation method, and the method uses a special vacuum sintering tool, so that the preparation method of the repair material is simple, the preparation cost is low, and the prepared repair material meets the requirement of repairing the three-dimensional size of the hot end part of the aeroengine and meets the requirement of repairing cracks with crack widths exceeding 1 mm. Patent 201710508805.0 discloses a crack brazing repair method for a turbine guide, which comprises the steps of removing cracks at the crack of the turbine guide, arranging a groove, paving bottom nickel-base alloy powder in the groove, placing mixed brazing filler metal on the bottom nickel-base alloy powder, and performing vacuum brazing. The joint repaired by the method can ensure stable structure and strength. Patent 202011131928.5 discloses a repair method for argon arc brazing of cast iron parts, wherein the heat source used in the method is argon arc welding heating, and defects of damaged parts of a repair piece are required to be removed and cleaned before repair. The method can realize crack-free efficient repair of the iron casting, has good mechanical property in a repair area and processability, and has small deformation due to the adoption of the argon arc with high energy density as a brazing heat source. It can be seen that one of the current common methods for crack repair is laser cladding, bu