Abstract: This paper constructs mathematical model of tubular joint weld of arbitrary section by simplifying the geometry structure. Geometric acoustics and computer simulation technology were used, and a cross sectional view of welded joints and the propagation path of ultrasonic waves was drawn in order to achieve a welded joint beam coverage model visualization, which can provide technical support and intuitive graphic display for the development of ultrasonic phased array testing process and setting detection parameters for better inspection effect. Study shows that it is beneficial for enhancing the effectiveness and achieving rapid and accurate detection of tubular joint weld by employment of visual beam and ultrasonic phased array technology.