Unstable Temperature Distribution in Friction Stir Welding

Abstract EN

In the friction stir welding process, a nonuniform and high generated temperature is undesirable.

Unstable temperature and distribution affect thermal and residual stresses along the welding line, thus necessitating mitigation.

This paper presents a simple method to prevent significant temperature difference along the welding line and also to help nullifying some defect types associated with this welding, such as end-hole, initial unwelded line, and deformed areas.

In the experimental investigation, a heat and force thermocouple and dynamometer were utilized while couple-field thermomechanical models were used to evaluate temperature and its distribution, plastic strain, and material displacement.

The suggested method generated uniform temperature distributions.

Measurement results are discussed, showing a good correlation with predictions.