Effects of Welding Sequence and External Restraint on Bending Deformity in thin-Plate ARC-Welded Joints.

Abstract

Bending deformity as a troublesome metallurgy issue is surely create in thin-plate arc-welded parts (mainly inferior 4 mm in thickness). This study aims to clarify the impact of welding sequence and external restraint on out-of-plane deformity in thin plates to learn a productive and practical design for the stop of welding-induced bending deformity. The exploratory method was taking advantage of for search present. The experimental results reveal that the outside limitation cannot avoid bending deformity in the thin-secure weldments, while it can considerably mitigate the amount of transverse (about 1.9 mm in this place) but not long turning. The welding sequence method can halt warping deformity, but it cannot remove the transverse bending persuaded by the non-uniform temperature field in the thin-plate thickness direction. In the present work, the transverse turning in the well-proportioned connecting is the lowest (about 1.9 mm), while that in the back-step welding is the largest (about 7.6 mm). In addition, symmetrical welding and continuous welding introduce the lowest (about 0.2 mm) and maximal (about 3.5 mm) longitudinal bending, individually. Two together outside restraint and welding sequence keep affect the bending deformity trend. For the thin-plate arc-welded components, symmetrical welding combined with external restraint is a very direct strategy for avoiding bending deformity. So the best result is symmetrical welding combined with external restraint (about 0.4 mm longitudinal bending and 0.2 mm transverse bending).