本文综述了超声点焊的特点,参量与机制等间题。对前人作过的16个实验,分析其压紧力P,时间τ,位移振幅ξ_m与强度Q的关系;并分析P,τ,ξ_m的最佳值;对于较厚的焊件,应进行频率自动控制。机制到现在尚未弄清楚。本文介绍了三种观点:(1)完全是摩擦过程;(2)热量与塑性形变是主要的,有时发生熔化过程;(3)摩擦、塑性形变与温度均予考虑,但仍无熔化现象。最后提出了发展动向。 This article reviews the features, parameters and mechanisms of ultrasonic spot welding. 16 experiments made to predecessors, analysis of the pressing force P, the time τ, the displacement amplitude ξ_m and the relationship between strength Q and analysis P, τ, ξ_m the best value for thicker weldment should be carried out Frequency automatic control. The mechanism has not been clarified until now. This paper presents three views: (1) is completely the friction process; (2) heat and plastic deformation is the main, and sometimes occurs melting process; (3) friction, plastic deformation and temperature are considered, but still no melting phenomenon. Finally proposed the development trend.