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Simulation pulse welding using Dflux subroutine Abaqus

In this example , we intend simulate pulse welding process using Dflux subroutine in Abaqus software

We use volumetric heat flux for simulation of the welding process, and we use Goldak’s double-ellipsoid model for define volumetric heat flux, and we use the Dflux subroutine for define Goldak’s double-ellipsoid model and pulsed power

Dflux subroutine is used to define nonuniform heat flux

 

This problem is done in two steps

In step1 , we simulate welding process with duration of 33.34 seconds

In step2 , we simulate cooling process with duration of 1000 seconds

To do so , we define two Coupled temp-displacement step

The material of the plate is SUS304

Density, thermal conductivity, specific heat, thermal expansion, elastic properties and plastic properties depend on the temperature

In this example , the welding power (Q) is defined in Pulse form

Here you can observe the diagram of the Pulsed Power with Frequency of 20 Hertz , in which the Peak of Power is 1000 Watts

we use the Dflux subroutine to define pulsed power

Goldak’s double-ellipsoid heat source model is adopted to calculate volumetric heat flux distributions as heat input around the welding pool

Equations of the Goldak’s heat source model is defined as a function of position and time together with a number of parameters

The constants a,b,Cf,Cr as shown in picture are heat source parameters that define the size and shape of the ellipses and these parameters are obtained from experimental analysis

Residual Stress (S33)
transversal residual stresses (residual stress in perpendicular to the welding path)

Duration :35 minutes

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