The influence of a workpiece shape on residual stresses during linear friction welding

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Abstract

Linear friction welding is an advanced technology for manufacturing titanium blisks for gas-turbine engine compressors, which are subjected to stringent requirements for cyclic strength and dimensional accuracy. Substitution of conventional butt joints with more technological T-shape joints is a promising area, which provides reducing of the pre-welding machining costs. The introduction of T-form joints requires additional research of thermal distribution specifics and strain-stress state formation in the welding process and after its end. Therefore, the study of residual stresses in titanium alloy T-shape joints produced by linear friction welding is topical. The paper investigates the residual stresses in imitating welded blisk joints. The authors consider the results of welding where the blade imitator has a reamed relief of a smaller section. The finite element model covering forging, cooling, and disassembly of welded specimens is offered. The authors developed the model in ANSYS Workbench to describe the strain-stress state of welded specimens, which allows for estimating the residual stress levels and spreading. The main distinctive feature of the model is an accounting of asymmetric temperature distribution obtained by finite-difference solving of a T-shape joint thermal problem and weld shape simulation obtained as a result of welded joints metallographic research. The presented model allows the evaluation of the residual stresses in joints. The distribution of residual stresses in T-shaped welded joints is specific – compressive stresses existing in a weld are balanced by tensile stresses acting at a distance of 1 mm from the joint. The formation of compressive stresses in a weld is caused by plastic deformation due to the forging force action.

About the authors

Anatoly N. Pautov

Ufa University of Science and Technology, Ufa

Author for correspondence.
Email: pautov.an@ugatu.su
ORCID iD: 0000-0003-3953-8062

senior lecturer of Chair of Welding, Foundry and Additive Technologies

Россия

Aleksandr Yu. Medvedev

Ufa University of Science and Technology, Ufa

Email: medvedev.ayu@ugatu.su
ORCID iD: 0000-0003-0945-0270

Doctor of Sciences (Engineering), Professor of Chair of Welding, Foundry and Additive Technologies

Россия

Vitaly R. Galimov

Ufa University of Science and Technology, Ufa

Email: galimov.vr@ugatu.su
ORCID iD: 0000-0001-8040-0570

postgraduate student, senior lecturer of Chair of Welding, Foundry and Additive Technologies

Россия

Olga V. Kolenchenko

Ufa University of Science and Technology, Ufa

Email: kolenchenko.ov@ugatu.su
ORCID iD: 0000-0002-2993-7425

PhD (Engineering), assistant professor of Chair of Welding, Foundry and Additive Technologies

Россия

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