Abstract
This paper presents experimental and numerical investigations on the characteristics of residual stresses generated by induction heating (IH) on 12 mm thick steel plates. IH at 250 °C and 350 °C provided high tensile residual stresses in the heating field but high compressive stresses away from the heating field. The double heating case generated higher compressive residual stresses—around 200 MPa—than the single heating case because of the superposition of the compressive residual stresses. It will be expected to improve the fatigue performance of welded joints when IH is applied for repair work on existing steel structural members susceptible to fatigue damage. Numerical simulation models for predicting residual stresses by IH were proposed by adopting the body heat flux input and the surface heat flux input. They will be beneficial for identifying the optimum heating conditions, such as the target temperature and the heating field, for applying IH to the actual repair work of the steel structural members.
Highlights
A tremendous number of steel structures have been constructed due to their substantial benefits for ease of construction, time saving, labor saving, flexible shapes, aesthetic, etc
History order to investigate the influence of heating field positions and temperature on the residual In In order to investigate the influence of heating field positions and temperature on the residual stress state, three cases of heating conditions were implemented: single heating with the target stress state, three cases of heating conditions were implemented: single heating with the target temperature of 250 °C (Case 1), double heating with the target temperature of 250 °C (Case 2), and temperature of 250 ◦ C (Case 1), double heating with the target temperature of 250 ◦ C (Case 2), and double heating with the target temperature of 350 °C (Case 3)
Numerical models were constructed with two different types of heat fluxes, the surface heat flux and the body heat flux, in constructed with two different types of heat fluxes, the surface heat flux and the body heat flux, in order to examine which type of heat flux could provide better simulation results for the induction order to examine whichdistribution type of heat flux could between provide the better simulation results for the induction heating
Summary
A tremendous number of steel structures have been constructed due to their substantial benefits for ease of construction, time saving, labor saving, flexible shapes, aesthetic, etc. Stresses [16,17,18] It issteel worth noting induction has been used Heat for localized heat treatment in welded used for pipelines and pressure vessels, which are basically made of thick plates, and it is not steel pipes to control tensile residual stresses [16,17,18]. Producing electromagnetic waves through an induction coil It can provide high safety in in this study, selected a portable source that would applicableintothis thestudy, localized heat the work sinceIHnowas open flame,assuch as that heat of a gas burner, is used.beTherefore, IH was treatment repairheat work of existing steelbebridges andto complicated in the of selected as and a portable source that would applicable the localized structures heat treatment andcase repair improving fatigue performance.
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