Profile: Handan Haituo Machienry Technology Co.,Ltd is a manufacturer of ultrasonic equipments. Our main products include ultrasonic shot peening equipments, ultrasonic food cutting equipments, ultrasonic rubber cutting equipments, ultrasonic cutting blades, ultrasonic impact surface finishing equipments, ultrasonic anti-fouling equipments and ultrasonic cell disruptors. Our equipments are widely used in different kinds of fields such as aircraft, bridge, defense, energy, food, manufacturing, medicine and railway. Ultrasonic impact treatment (UIT) is one of the processes for fatigue life improvement of welded elements and structures. In most of industrial applications, this process is also known as ultrasonic peening (UP). The beneficial effect of UIT/UP is achieved mainly by relieving of harmful tensile residual stresses and introducing of compressive residual stresses into surface layers of materials, decreasing of stress concentration in weld toe zones and enhancement of mechanical properties of the surface layers of the material.