Abstract
A series of fundamental experimental investigation was conducted in order to examine the effect of PWHT by sheet-type ceramic heater on the residual stress, deformation and compressive behavior of non-stiffened welded box columns. The sheet-type ceramic heater was able to control the required temperature history for PWHT with high accuracy. The welding-induced tensile and compressive residual stresses of the specimens were reduced by 90% and 76% respectively with PWHT. Besides, PWHT could reduce the welding-induced out-of-plane deformation by 22%. It was revealed that the PWHT specimens had a slight higher stiffness than the As-welded specimens when applying monotonic static compressive load on both As-welded and PWHT specimens. They could also enhance the ultimate compressive load capacity about 32% of that of the As-welded specimens. The effectiveness of PWHT with the sheet-type ceramic heater could be confirmed.
Highlights
Welded open sections and closed sections have been generally used in steel buildings and bridge constructions due to a limitation of size availability in the rolled shaped sections
The AW specimens underwent buckling at the earlier load stage than the post-weld heat treatment (PWHT) specimens. It might be because the out-of-plane deformation and the residual stresses induced by welding in AW specimens were higher than those in the PWHT specimens
A series of fundamental experimental investigation was conducted in order to examine the effect of PWHT by the sheet-type ceramic heater on the residual stresses, deformation and compressive behaviors of the non-stiffened welded box columns
Summary
Welded open sections and closed sections have been generally used in steel buildings and bridge constructions due to a limitation of size availability in the rolled shaped sections. It is well known that the reduction of the welding-induced residual stresses is effective for ensuring and enhancing the structural performances such as fatigue durability and load-carrying capacity of the steel members. The heat source chosen for this study was intended for a future application in the localized heat treatments and repair works for the existing steel bridges and the complicated structures. A fundamental experimental investigation was conducted in order to examine the effect of PWHT by the sheet-type ceramic heater on the residual stresses, the deformation and compressive behavior of the non-stiffened welded box columns in this study
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