The Paton Welding Journal, 2013, №01



2013 №01 (05)

2013 №01 (07)

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The Paton Welding Journal, 2013, #1, 28-30 pages  

EFFECT OF FRICTION WELDING PARAMETERS ON STRUCTURE AND MECHANICAL PROPERTIES OF JOINTS ON TITANIUM ALLOY VT3-1

A.G. SELIVERSTOV¹, Yu.M. TKACHENKO², R.A. KULIKOVSKY², V.I. BRAGINETS³ and I.V. ZYAKHOR⁴

¹OJSC «Motor Sich», Zaporozhie, Ukraine
²Zaporozhie National University of the Ministry of Education and Science of Ukraine, Zaporozhie, Ukraine
³Zaporozhie Research-Engineering Centre for Plasma Technologiesof the E.O. Paton Electric Welding Institute, NASU, Zaporozhie, Ukraine
⁴E.O. Paton Electric Welding Institute, NASU, Kiev, Ukraine
 
 
Abstract
The study presents investigation results on formation of joints in friction welding (FW) of titanium alloy VT3-1, which is used in structure of axial-flow compressors of aircraft gas turbine engines (GTE). The purpose of the study was to optimise parameters of FW of alloy VT3-1, based on the possibility of its implementation by using modern equipment for linear friction welding (LFW) in order to manufacture and repair GTE monowheels, i.e. the so-called blisks. Optimal values of the FW parameters were determined on the basis of results of mechanical tensile tests, metallographic examinations and measurements of microhardness of the welded joints produced by FW in air and in shielding gas atmosphere (argon). It was established that in FW of alloy VT3-1 the sound (defect-free) joints can be produced over a wide range of variations in the process parameters, providing that the specified value of the total length loss in welding in ensured. Strength values of the joints exceed those of the base metal of alloy VT3-1. As a result of intensive thermomechanical deformation at temperatures above the b-transus temperature of alloy VT3-1 and rapid cooling after FW, the joining zone metal has a dynamically recrystallised fine-grained structure and increased hardness. Based on the results obtained, the FW parameters were optimised for alloy VT3-1 at a comparatively low linear velocity of relative motion of the billets, which is feasible in LFW of titanium alloys by using the existing equipment. 22 Ref., 1 Table, 6 Figures.
 
 
Keywords: friction welding, titanium alloys, mechanical properties, full strength, welding parameters
 
 
Received:                14.06.12
Published:               28.01.12
 
 
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