Numerical Study Of The Residual Stress Field
During Arc Welding With A Trailing Heat Sink
Author(s)
F. A. Soul & Z. Yanhua
Abstract
The arc welding process is widely used in areas such as the aerospace industry,
shipyards and others. The stress and distortion induced by the arc process is high
compared with other fusion welding processes such as LBW or EBW. This paper
presents the numerically predicted results of a study aimed at establishing the
temperature distribution, distortion and the residual stress field developed during
the conventional welding process and after enhancement with a trailing heat
sink. A numerical analysis of the thermo-mechanical process using FEM by
means of ANSYS code was carried out. The analysis results obtained showed
that this technique strongly improves the welding process by means of
minimizing the residual stress and distortion especially when small thicknesses
were applied. It was found that the distance between the welding arc and the
cooling one is an important factor for improving results.
Keywords: arc welding, temperature field, residual stress, distortion.
1 Introduction
The highly localized transient heat and strongly non-linear temperature fields in
both heating and cooling processes cause non-uniform thermal expansion and
contraction, and thus result in plastic deformation in the weld and surrounding
areas. As a result, residual stress, strain and distortion are permanently produced
in the welded structures. High tensile residual stresses are known to promote
fracture and fatigue. Longitudinal tensile residual stresses may induce undesired
distortion such as cambering (Fig. 1).
There is no way to control these phenomena during the welding process only
by applying some technique. Through the last decades mechanical tensioning
Keywords
arc welding, temperature field, residual stress, distortion.
Related Book
Other papers in this volume
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