Ultrasonic Impact Treatment Equipment for steel Stress relief
he new generation Ultrasonic Impact Treatment (UIT) equipment is
based on Piezoelectric Ceramic Transducer ( PCT ) technology, first
developed by Sunbowtec for use around the world in 1995. It's the
new direction of UIT technology and has already received
- HIGHER EFFICIENCY
- Transfermation rate of piezoelectric ceramic transducer is nearly
50% higher than that of megnetostriction transducer(MT).
- DIGITAL CONTROL
- Closed-loop control with DSP chip ensures stabilization of the
- NO WATER COOLING REQUIRED
- The ( PCT ) transducer generates less heat than ( MT ) type
transducers. Therefore only integral fan cooling of the (UIT) tool
- DUTY CYCLE
- Over 16 hours of continuous operation if required.
- Suitable for all metallic materials such as high strength steel of
1400 MPa, titanium alloys, aluminium alloys, etc.
1. The theory of ultrasonic impact treatment
Ultrasonic impact treatment equipment is consisted of 2 parts. One
is ultrasonic impact gun and the other is power control box. This
equipment gives the high power to the head of the impact gun,
forcing it to impact the metal surface at a speed of over 20,000
times per second, which makes the surface a great plastic
transmogrification. At the same time, the impact changes the stress
field, dispersing tension stress while transforming it into
beneficial compression stress. Also, the sharp increase and
decrease of the surface temperature changes the surface metal
organization so that enhance it.
2. How to increase the fatigue life by UIT(ultrasonic impact
Normal welding usually leaves defects in the joint part, including
excess weld metal, rut, undercut and so on, which causes serious
stress centralization. Meanwhile, welding causes residual stress.
All these factors above do harm to the fatigue quality. Also, these
is usually dross in the surface of toe zone, which accelerates the
outburst of fatigue crack..
Using UIT equipment to process toe zone after welding, we can make
a smooth transition to decrease stress centralization by excess
weld metal, dispersing defects in the surface of toe zone. At the
same time, it creates compression stress there by compression
plastic deformation and adjust residual stress field, enhancing the
intensity and hardness of toe zone.
UIT equipment can be used in the process of almost all kinds of
metal after welding. It is the most efficient seasoning method to
disperse residual stress and creating compression stress. By using
it, the fatigue strength of steel joint increases by 60-180%, the
fatigue life prolongs by 30-130 times. The fatigue strength of Al,
Ti joint increases by 26-44%, the fatigue life prolongs by 5-40