Layered ultrasonic impact treatment method capable of optimizing structure and performance of weld

Abstract

The invention discloses a layered ultrasonic impact treatment method capable of optimizing the structure and the performance of a weld. The layered ultrasonic impact treatment method comprises the following steps: completing preparations before welding at first, wherein a base material in a groove of the weld with ethyl alcohol is cleaned, adherent greasy dirt caused by machining is removed, and then the cleaned base material is dried by an air blower; welding the first layer of welding bead, and removing welding slag by using a steel wire brush after the first layer of welding bead is welded; when the first layer of welding bead is cooled to range between 500 DEG C or below and the room temperature, performing ultrasonic impact on the first layer of welding bead by using ultrasonic impact equipment; after the ultrasonic impact on the first layer of welding bead is finished, removing slag inclusion caused by the ultrasonic impact process by using the steel wire brush; and then repeating the above steps until the whole weld is welded. According to the layered ultrasonic impact treatment method disclosed by the invention, the weld is subjected to layered ultrasonic impact in a multi-layer multi-welding-bead welding process, so that the internal mechanical properties of the weld can be optimized.

Description

technical field [0001] The invention relates to a layered ultrasonic impact treatment method for optimizing the structure and performance of weld seams, belonging to the field of welding. Background technique [0002] Under welding conditions, the weld microstructure usually grows toward the center of the weld in the form of columnar crystals, and coarse columnar crystals are easily formed when the thermal weld input is too large. Especially in the multi-layer multi-pass welding process, the weld seam undergoes multiple welding heat cycles, which easily leads to the deterioration of the internal structure of the weld seam and the decline in mechanical properties. [0003] Ultrasonic impact is an ideal post-weld treatment method. The principle of post-weld ultrasonic impact is to impact the surface of the welded joint with a high-speed impact needle to cause plastic deformation and form a certain thickness of residual compressive stress layer. The method is easy to operate, ...

AI Technical Summary

Problems solved by technology

This method is to perform ultrasonic impact on the back of the weld seam at a certain distance behind the molten pool during the welding process. This method cannot change the structure of the weld seam, and this method has high requirements for equipment and requires special devices. On-site construction is relatively difficult.

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