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Registration Number

0217U004035, 0112U002398 , R & D reports

Title

Research and development of electron beam welding technology of magnesium and magnesium-based alloys

Head

Nesterenkov Volodimir Mikhailovich, Доктор технічних наук

Registration Date

11-01-2017

Organization

E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine

Description

In order to enhance the quality of welded joints and eliminate cracks formation in weld metal and heat affected zone on magnesium-based alloys investigated, the edges to be welded were treated prior EBW by means FSW (Friction Stir Welding) method. At this method the metal of butt surfaces being welded don't reach the molten state but the directional grain orientation caused by rolling is eliminated together with grain size reduction, as well as the compaction of parent metal, balancing of intermetallides volumetric distribution and averaging of crystallites size occur. Using of filler materials in the form of foils of 0.1-0.4mm thickness alloyed by zirconium and scandium at EBW of magnesium-based allous makes it possible to reduce significantly the weld grains size and improve the mechanical properties of welded joints. Addition of neodymium to foil composition allows to increase the plasticity of welded joints and ensure the weld strength factor K=0,90-0,95. Application of electron beam welding of magnesium-based alloys in pulsed mjde results in decrease of weld and heat affected zone width in comparison with welded joints obtained without modulation of electron beam. Depth of penetration rises at the reduction of pulse mode rigidity, i.e. the reduction of ratio of pulse duration to duration of pause between pulses, lateral walls of welds becomes practically parallel along the all depth of penetration without local widening in a weld root area. Metallographic investigations of welded joints of magnesium-based allous confirmed the formation of finer structural generations in the case of welded edges FSW treatment application, as well as at EBW performance in pulsed mode. Strength and metallurgical investigations of welded joints of magnesium-based alloys with modified edges of up to 100mm thickness confirmed the possibility of EBW technology developed introduction into industrial fabrication of products for aerospace application. In process of research works the prototypes of industrial products made of magnesium-based alloys with linear and circumferential butt joints of 100mm thick were manufactured, welded and passed strength and metallurgical investigations.

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Кравчук Леонід Аркадійович
Нестеренков Володимир Михайлович
Орса Юрій Вікторович
Хрипко Костянтин Сергійович