The Paton Welding Journal, 2015, №01



2015 №01 (08)

DOI of Article 10.15407/tpwj2015.01.01

2015 №01 (02)

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The Paton Welding Journal, 2015, #1, 2-10 pages  

MODELING OF HEAT PROCESSES FOR IMPROVEMENT OF STRUCTURE OF METALS AND ALLOYS BY FRICTION STIR METHOD

A.L. Majstrenko¹, V.M. Nesterenkov², V.A. Dutka¹, V.A. Lukash¹,  S.V. Zabolotny¹ And V.N. Tkach¹

¹V.N. Bakul Institute for Superhard Materials, NASU. 2 Avtozavodskaya Str., 04074, Kiev, Ukraine. E-mail: alcon@ism.kiev.ua
²E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
 
 
Abstract
Developed was a computer model of temperature field in tool and parts in process of their friction stir welding. Modeling of the temperature field was carried out for both successive stages of welding process, i.e. plunging of pin of tool operating element into part (1st stage) and progressive motion of plunged pin in part (2nd stage). The mathematical model represents itself a nonlinear equation of transient heat conduction, which takes into account progressive pin movement during the 2nd stage of welding. Two constituents describe the heat sources, appearing in welding. The first one considers power of heat sources, caused by friction of tool with parts on contact surfaces, the second one takes into account heat generation, promoted by mechanical deformation of part material. Mathematical modeling and experimental examination of temperature field were carried out for tool from cubic boron nitride (cubonit) and hard alloy as well as copper parts during FSW. Adequacy of developed model was determined based on correlation of numerical and experimental results. It is shown that application of superhard materials (cubonit and hard alloy) for manufacture of tool operating elements gives a possibility to provide thermo-mechanical resistance of tool during welding. A possibility is also shown for increase of strength of welded joints of parts from magnesium alloy ML10, gained as a result of application of FSP for modifying of structure of surface layers in parts to be welded with their further electron beam welding. 27 Ref., 1 Table, 14 Figures.
 
 
Keywords: mathematical modeling, friction stir welding, temperature field, tools from superhard materials, structure modification, electron beam welding
 
 
Received:                20.10.14
Published:               28.02.15
 
 
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