Laser welding connecting device and technology of forged steel piston

Abstract

The invention relates to a laser welding connecting device and technology of a forged steel piston. The device mainly comprises a laser, an intermediate frequency induction heating device, adjustable variable speed rotating devices, piston clamping devices, a base and supporting components. The technology comprises the steps of 1, surface pretreatment: after treating the surface of the piston through a mechanical method, placing the treated piston into an acetone solution to be subjected to ultrasonic cleaning; 2, assembly: after accurate locating, starting the piston clamping devices to fix the piston at the clamping range (phi) of 100 mm to 150 mm; 3, preheating: energizing the intermediate frequency induction heating device to preheat the piston at the temperature of 350 DEG C to 500 DEG C for 1 min to 3 min; 4, welding: turning off the intermediate frequency induction heating device, starting the adjustable variable speed rotating devices to rotate the piston at the speed of 0.5 m / min to 0.9 m / min, and starting the laser of which power is 3 kw to 5 kw to weld the piston; and 5, slow furnace cooling: putting the piston into a constant-temperature heat-insulated furnace at the temperature of 350 DEG C to 400 DEG C, turning off the power, and carrying out furnace cooling on the piston. According to the laser welding connecting device and the laser welding connecting technology, the problem that joints crack after welding can be solved, and welding quality of the laser welding joints of the forged steel piston is guaranteed.

Description

[0001] Technical field: [0002] The invention relates to a forged steel piston laser welding connection device and process, which is used in the manufacture of medium and heavy truck diesel engine pistons, and is connected by laser welding for the difficult-to-process parts of the forged steel piston, belonging to the field of welding and connection technology. [0003] Background technique: [0004] A diesel engine is a device that converts internal energy into kinetic energy through the action of cylinders and pistons. Piston is one of the important parts of diesel engine. When the diesel engine is working, the piston reciprocates at high speed and withstands the high temperature of 400-450°C and the scour of 13-20Mpa high-pressure gas, which requires the piston to have properties such as high temperature resistance, oxidation resistance, corrosion resistance, thermal shock resistance and wear resistance. At present, medium and heavy truck diesel engine pistons are made of ...

AI Technical Summary

Problems solved by technology

42CrMo and 38MnVS 6 Belongs to medium-carbon high-strength steel, poor weldability

Friction welding technology is mature; but the existing problem is that hardened structure is easy to appear in the joint after welding. The hardened structure is hard and brittle. Once formed, it will easily lead to cracking of the joint. engine damage

However, the laser welding of forged steel pistons is used in the manufacture of medium and heavy truck diesel engine pistons. The pistons are large in size, complex in structure, and the wall thickness is usually greater than 5mm; Difficult to achieve during laser welding

So far, there have been no detailed reports on how to reduce the crack tendency of forged steel piston laser welding joints and ensure the welding quality of forged steel piston laser welding joints

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