Thermo-mechanical modelling of welding induced strains - Numerical validation of the weld build-up process

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Authors
  1. Goldak, J.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Goldak Technology Inc., Ottawa, ON (CAN)
Abstract
The objective of this project was to simulate the weld build-up process in two experimental setups. Setup I had a central depression with dimensions of 100 x 100 x 3 mm, while Setup II had a central depression with dimensions of 200 x 200 x 3 mm. Weld passes were deposited in the depressions in a symmetrical sequence which incrementally increased the clad width and hence balanced the welding induced strain. The plate material was made of HY80 and the filler metal Fortrex NQ1 (AWS E9016). During the welding process, transient temperatures were recorded with thermocouples and transient strains with strain gauges. After welding and cool-down to room temperature, the distortion on the bottom of each plate was measured. This report documents the simulation of this welding procedure. 3D finite element meshes were created using brick and prism elements that capture the 3D transient geometry of the setups as accurately as possible. Several analyses were performed for both setups, Each analysis computed the 3D transient temperatures, microstructure, displacement, strain and stress due to preheat, welding and cool-down. In these analyses, the filler metal was added dynamically as in the real welding process. The numerically acquired temperature, strain and displacements data compare well with their experimentally acquired counterparts. It is important to realize that no fitting of parameters was done to improve this agreement, except to fit a convection coefficient for the insulating e

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Report Number
DRDC-ATLANTIC-CR-2008-283 — Contractor Report
Date of publication
01 Mar 2009
Number of Pages
62
DSTKIM No
CA032801
CANDIS No
532009
Format(s):
Electronic Document(PDF)

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