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Home Material Sciences Equipment for Ultrasonic Impact Treatment of Metals (UIT)

Equipment for Ultrasonic Impact Treatment of Metals (UIT)

Description

The surface state plays an important role during operation of constructions and especially such ones, which work in the conditions of vibrations. Such terms lead to formation of cracks in surface layers, which result in fatigue destruction of a construction as a whole under following operation. The different kinds of welded joints are the most dangerous sites of constructions. There are a plenty of methods for surface hardening of metals, which can improve the fatigue life and durability of responsible elements and parts of different machines, mechanisms and constructions. Employment of such methods allows considerably increase the operation life of machines and constructions. A number of them are based on the severe plastic deformation of surface due to multiple impact loads. The deformation leads to hardening of a surface and formation of compressive residual stresses in surface layers.

Among the traditional technologies in this direction the following methods are widely well-known: hammer peening, shot peening, etc. Currently the Ultrasonic Impact Treatment (UIT) becomes more widely used as a method for local hardening of the metal surfaces. Especially successful experience of application of the UP is related to hardening of welded joints. Long-term researches of mechanisms of structural and phase transformations in metals and alloys caused by UIT, conducted in Kurdyumov Institute for Metal Physics NAS of Ukraine became scientific basis to creation of this technology.

Innovative Aspect and Main Advantages

New modification of portable ultrasonic apparar hardening and relaxation treatment of welded joints with the output power of 300 W is developed at the G.V. Kurdyumov Institute for Metal Physics of the N.A.S. of Ukraine. The developed ultrasonic equipment is supplied with piezoceramic transducer and has low dimensions and weight. Application of piezoceramic transducers instead of magnetostrictive ones as the ultrasound source is the key difference of our development in comparison with the one, which is proposed by Applied Ultrasonic Inc. (USA). The latter one is much heavier (by 3-4 times), both considerable energy consumption and water-cooling are needed. Therefore, it is difficult to use the equipment in-the-field conditions. Similar equipment with piezoceramic transducers is made also in China. However, its technical characteristics are worse in comparison to our one (table).

Table – Competitive matrix

Application of piezoceramic transducers substantially reduces the energy consumption, cost of equipment, and also expands technological possibilities as a result of comfort of the use in various branches of industry due to small dimensions and weight. The use of this method allows improving fatigue strength of welded joints by 20 – 30 % and permits substantially increasing their durability.

Areas of Application

Application of technology of UIT prolongs the operation life of responsible constructions in a bridge- and ship-building, on a transport, in production of Goliath cranes and in other branches of industry.

The portable ultrasonic apparatus for hardening and relaxation
treatment of welded joints
Fig. 1 The portable ultrasonic apparatus
for hardening and relaxation treatment
of welded joints with the power
output till 650 W.

Stage of Development

UIT equipment are protected by:

  • Ukrainian Patent # 8366 A;
  • Ukrainian Patent # 13936 A;
  • The device available for demonstration and field tested.

Contact Details

G.V. Kurdyumov Institute for Metal Physics, NAS of Ukraine
Address: 36, Vernadsky Str, 03680, Kyiv, Ukraine
Contact person: Prof. Volodymyr Nadutov
Tel.: (+38 044) 424 3305
Fax: (+38 044) 424 2561
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

Comments   

 
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Quote
 

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