Two pass welding of the pipe using D-flux subroutine in the Abaqus

Project Overview

In this example, the two-pass welding process of a pipe is simulated using the DFLUX subroutine in Abaqus.

The simulation consists of two welding passes. Initially, the first welding pass is performed. After the first pass, the pipe undergoes a cooling process. The second welding pass is then performed, followed by another cooling process.

The Goldak's double-ellipsoid model is used to define the heat flux. The DFLUX subroutine is utilized to implement the Goldak's double-ellipsoid heat source in Abaqus.

Two-Pass Welding Process

The main feature of this simulation is the implementation of two welding passes on the pipe.

First, the welding heat source is applied during the first welding pass. After completing the first pass, the pipe undergoes a cooling stage.

After the cooling stage, the second welding pass is performed. Finally, the pipe undergoes another cooling process.

First welding pass followed by the cooling process.

Second welding pass followed by the final cooling process.

Goldak's Double-Ellipsoid Heat Source

The Goldak's double-ellipsoid model is used to define the heat flux generated by the welding heat source.

The Goldak heat source provides a nonuniform distribution of heat in the welding region and is implemented in Abaqus using the DFLUX subroutine.

The DFLUX Fortran subroutine is used to define the Goldak's double-ellipsoid heat source during the two welding passes.

Goldak's double-ellipsoid heat source used to define the welding heat flux.

Cooling Process

Cooling is considered after each welding pass. This allows the thermal history of the pipe to be evaluated during the multi-pass welding process.

The first cooling stage is performed after the first welding pass, while the final cooling stage is performed after the second welding pass.

Material Properties

The material used in this simulation is Stainless-steel-SA240.

The material information is provided as an Excel file with the project files.

What You Will Learn

• How to simulate two-pass welding of a pipe in Abaqus.
• How to define the first welding pass.
• How to define the cooling stage after the first pass.
• How to define the second welding pass.
• How to define the final cooling stage.
• How to use the DFLUX subroutine in Abaqus.
• How to implement a Fortran DFLUX subroutine.
• How to use Goldak's double-ellipsoid heat source.
• How to define the welding heat flux using DFLUX.
• How to simulate multi-pass welding on a pipe.
• How to define Stainless-steel-SA240 material properties.

Key Features

• Two-pass welding of a pipe.
• First welding pass.
• Cooling process after the first pass.
• Second welding pass.
• Final cooling process.
• DFLUX Fortran subroutine.
• Goldak's double-ellipsoid heat source.
• Welding heat flux defined using DFLUX.
• Stainless-steel-SA240 material.
• Step-by-step training video.
• Abaqus CAE model.
• Abaqus INP file.
• Fortran subroutine code.
• Excel material file.