Method for efficiently eliminating residual stress of welded plate and implementation device thereof

Abstract

The invention discloses a method for efficiently eliminating the residual stress of a welded plate and an implementation device thereof, the welded plate is a 316L stainless steel welded plate, and the method for eliminating the residual stress comprises the following steps: covering the welded plate with a flexible heating plate, heating to a set temperature and preserving heat, and when the temperature of the lower surface of the welded plate reaches the set temperature, stopping heating; and ultrasonic vibration is applied to the bottom of the welded plate, heating is stopped while ultrasonic vibration is stopped, the welded plate is placed in air to be cooled to the room temperature, and then residual stress elimination is completed. The set temperature of the flexible heating plate is 150 DEG C to 180 DEG C; the ultrasonic vibration frequency is 20 KHz, the amplitude is 0.2 mm-0. 8 mm, the vibration time is 3 min-8 min, the applied ultrasonic power is determined according to the size of a welded plate, and it is guaranteed that the unit area power of ultrasonic waves in a weld joint area, a fusion area and a heat affected area of the welded plate is 0.09 W / mm < 2 >-0.45 W / mm < 2 >. According to the residual stress elimination method, low-temperature heating and ultrasonic vibration are combined, residual stress elimination is achieved at low temperature, energy consumption is low, and efficiency is high.

Description

technical field [0001] The invention relates to a method for efficiently eliminating residual stress of welded plates and a device for realizing the same, belonging to the technical field of residual stress elimination. Background technique [0002] Residual stress refers to the fact that the workpiece will be affected by various factors such as processes during the manufacturing process; when these factors disappear, if the above-mentioned effects and effects on the component cannot be completely disappeared, there are still some effects and effects. If the influence remains in the component, the residual effect and influence are called residual stress. Residual stress is generally harmful, but it will not appear as a defect immediately. Only when the workpiece is in work due to the superposition of the working stress and the internal residual stress, the total stress exceeds the strength limit, and defects such as cracks and fractures will appear. [0003] 316L stainless ...

AI Technical Summary

Problems solved by technology

After welding, a large amount of residual stress will be generated, which is usually eliminated by heat treatment at a temperature higher than 500°C. Although it is effective, it needs to be heated to a higher temperature, which requires high energy consumption, and the production cycle is long, time-consuming and labor-intensive.

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