UIT

Ultrasonic Impact Treatment (UIT)

HJ series Ultrasonic Impact Treatment Equipment

The “New Generation” Ultrasonic Impact Treatment (UIT) equipment is based on Piezoelectric Ceramic Transducer (PCT) technology and was first developed by Sunbowtec in 1995 and recognised internationally, it is the new direction of UIT technology.

UIT was invented in Rusia in 1972. Since then UIT has been the subject of considerable research to substantiate the beneficial effect of the process with respect to fatique performance. Many research institutes such as The Paton Institute (UA), Tiajin University (PRC), Leigh University (USA) and The Laboratory of Steel Structures (USA) for example have conducted extencive research on the UIT process aimed at improving the fatigue performance of highway structures such as Steel Bridges, Traffic Signals and Light Poles. Such work has demonstrated that the fatigue performance of as-welded structures can be improved with the application of the UIT process.

The UIT equipment consists of a Power Control Unit and Ultrasonic Impact Gun. The UIT process works by converting harmonic resonations of a acoustically tuned body energised by an ultrasonic of an acoustically tuned body energised by an ultrasonic transducer into mechanical impulses imparted into the surface of the material being treated. In the conversion process the energising transducer has frequency of 20 kHz.

Industrial Segments Currently Utilizing UIT Technology

Ultrasonic Impact Treatment is a mechanical method that can be applied to weld toes to reduce tensile residual stresses and locally modify the weld geometry to improve fatigue performance and prolong fatigue life. Futhermore it can even reshape the appearance of the welding toe and intensify the strength by surface engineering as shown below.

UIT is carried out on the toes of welds where it modifies the toe shape, reducing the acuity of the mechanical notch. The UIT tool creates a zone of residual compressive stress at the weld toe where stress concentration is greatest for residual and applied tensile loads.

Beneficial Effect of Ultrasonic Impact Treatment

  • Reduction of tensile stress. Formation of a white layer up to 10 micrometers in depth with exceptional corrosion resistance, abrasion resistance, and lubricity
  • Plastic deformation of the material surface. Reduction of tensile stress and the introduction of favourable compression stress up to 12 milimeters in depth.
  • Alteration of the surface finish, resulting in a smoother surface and eliminating defects
  • Improvement in  endurance and corrosion resistance. Up to 250% and 400% respectively
  • Improving the fatigue strength of steel welded  joints 60%-180%, life expectacy 10-130 times
  • Improving the fatigue strength of aluminium, titanium, and  non-ferrous metal welded joint 26%-42%, life expectancy 5-40 times.
  • Reduction of maintenance costs in metal structures subject to corrosion/fatigue failure.
  • Opportunities to decrease manufacturing and operation cost through utilisation of increased strength alloys, previously limited by the materials welding properties

Equipment Advantages

  • Higher efficiency transformation rate of the (PCT) is nearly 50% higher than that og magnetostrictive Transducer (MT).
  • Digital control closed loop control with DSP chip ensures stabilization of the generator unit
  • No water cooling required the PCT tranducer generates less heat tha MT type Machines as such only fan cooling is required
  • Duty cycle 16+ hours of continuous working if required
  • Applications suitable for all metallic materials such as high strength steel of 1400Mpa, Titanium, Aluminium, broze, iron, steel, Dissimilar Material etc.

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