The Paton Welding Journal, 2017, №02



2017 №02 (04)

DOI of Article 10.15407/tpwj2017.02.05

2017 №02 (06)

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The Paton Welding Journal, 2017, #2, 23-27 pages
 

Influence of parameters of ultrasonic mechanical oscillations on the structure and mechanical properties of weld metal in laser welding of ferritic steels

V.V. Somonov

Peter the Great St. Petersburg Polytechnic University 29 Politekhnicheskaya Str., 195251, St. Petersburg, Russian Federation. Е-mail: ballak@inbox.ru
 
Abstract
The problems of welding pool control in welding of ferrite stainless steels were considered. A comparative analysis of the works in the field of effect of ultrasonic and vibration oscillations on the weld was carried out. The results of preliminary experimental and metallographic examinations of specimens of joints produced by laser welding with additional ultrasonic effect on welding pool were reflected. The effect of positioning of clamps and the source of ultrasonic waves relative to the butt interface on the character of oscillations arising in it was studied. The most favorable frequencies and amplitudes of oscillations for generation of oscillations in the butt area were determined. The results on influence of the material thickness on the oscillations arising in it were obtained, which can exert an effect on stability and cooling rate of welding pool and, as a result, on the microstructure of weld metal. 11 Ref., 1 Table, 5 Figures.
 
Keywords: laser welding, ultrasonic waves, ferrite stainless steels, welding pool, microstructure
 
 
Received: 01.11.16
Published: 16.03.17
 
 
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