Ultrasonic vibration assisted welding method

Abstract

The invention relates to the field of welding and in particular relates to an ultrasonic vibration assisted welding method. The method comprises the following steps: in a welding process of fusion welding, providing an ultrasonic vibration force through an ultrasonic excitation vibration device; introducing ultrasonic frequency stress wave into a welding fusion tank; finally, transmitting vibration to a welding part. With the adoption of the configuration, the quantity of crystal nucleuses can be effectively increased, the size of crystal grains is prevented from growing, dendritic crystals are crushed and a crystal shape is changed, so that condensed welding line metal crystal grains are thinned; gas, impurities and the like in the fusion tank are prompted to rapidly float up, and defects of air pores and slag adding are reduced; welding residual stress and welding deformation are reduced; components are more uniform so that a welding line metal structure is improved; a fusion region becomes narrow and is uniformly transited, and non-fusion defects are reduced; comprehensive mechanical properties of welding lines are improved through the effects above.

Description

technical field [0001] The invention relates to the field of welding, in particular to an ultrasonic vibration-assisted welding method. Background technique [0002] Welding is an important material joining process, widely used in petrochemical, aerospace, marine engineering, vehicles, ships, and various metal structures and other industrial sectors. Welding cracks (cold cracking, hot cracking), welding residual stress, weld defects and welding deformation are common problems in welding production. The existence of these problems will greatly affect the service performance of the welded connection structure. For this reason, a variety of technological methods for strengthening welded joints have been developed. For example, heat treatment, hammering, ultrasonic impact, rolling strengthening, etc., and have been applied in actual production. [0003] Among them, post-weld heat treatment is a process in which the metal weldment is heated to a certain temperature in a furnac...

AI Technical Summary

Problems solved by technology

However, the depth of the ultrasonic shock treatment layer is generally within 1.5mm, so for welds with large cross-sectional dimensions, it is difficult to completely eliminate welding defects such as welding hot cracks, incomplete fusion and incomplete penetration by ultrasonic shock treatment after welding.

Images