Numerical and experimental investigations on welding residual stress in multi-pass butt-welded austenitic stainless steel pipe

Investigations on welding residual stresses in penetration nozzles by means of 3D thermal elastic plastic FEM and experiment

The welding with weaving has been used widely to obtain better weld quality by avoiding lack of side wall fusion and improve the weld efficiency by obtaining the wide weld bead. But the effect of weave frequency and weave amplitude on the temperature field is not clear. In the present paper, a coordinate transformation method is put forward to simulate the weave welding process. The temperature distribution during the welding with weaving under different weave parameters are compared and discussed. Comparison between experimental and simulation results reveals a good agreement. The peak temperature and the average temperature in weld seam center decreased due to the increasing of the weave amplitude and weave frequency. But the weave frequency has less effect on the average temperature.

Effect of weave frequency and amplitude on temperature field in weaving welding process

Numerical simulation and experimental investigation of temperature and residual stresses in GTAW with a heat sink process of Monel 400 plates

Although welding with weaving had been widely adopted to improve welding efficiency, the effects of weaving arc on temperature and stress fields were not clearly understood. In the present paper, a conversion of coordinates was implanted in a finite element model to improve the calculation precision and comprehend the characteristic of welding with weaving. Comparing with the results of the welding without weaving, a characteristic with lower peak temperature and wider weld bead was presented during the welding with weaving, and the temperature gradients near the weld pool was steeper. The results also indicated that the transverse residual stress of welding with weaving was greater than that of welding without weaving, while the longitudinal residual stress was similar. Both temperatures and residual stresses were compared with those of the experiments.

L. M. Habip

Papers

Optimization of residual welding stresses in austenitic steel piping: prooftesting and numerical simulation of welding and postwelding processes