MACHINE MODELING AND SIMULATIONS, Machine modeling and simulations 2020

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Numerical prediction of temperature field, melted zone and deformation of single-sided welded T-joint by laser beam
Zbigniew Saternus, Wiesława Piekarska, Marcin Kubiak, Tomasz Domański

Last modified: 08. 06. 2020

Abstract


The introduction of laser welding techniques into production allowed to perform new types of joints impossible to obtain in conventional arc welding. One of such joints is a single-sided welded T-joint, usually used in rotor blades. This type of joint do not require the use of additional material. One of issues arising during the process are welding deformations. Experimental determination of the formation of the deformation is problematic, therefore numerical modeling is carried out at the initial stage of the design of T- joints.

The paper presents numerical prediction of deformations of single-sided welded T-joint. Numerical analysis is based on the experimental test of single-sided welding of two sheets made of austenitic steel X5CrNi18-10.  The welded joint is performed using a laser welding source. As part of the experiment, metallographic tests are performed to determine quality of the joint. Numerical calculations are performed in the Abaqus/FEA software. The same geometrical model is developed as in the experiment. Material model of steel X5CrNi18-10 is used assuming temperature dependant materiał properties. Modeling of the motion of heating source is done on the basis of an additional subroutine including the mathematical description of the distribution of the heating source. The welding source parameters are adapted in the calculations with respect to the real welding process parameters.

Based on performed computer simulations, the temperature distribution in the joint is determined. The shape of metled zone is numerically estimated as well as deformation field of T-joint. The melted zone is compared to shape of the weld obtained in the experiment.