Abstract
In this study, pressure finite element welding simulations has been carried out. The welding model is a butt filled weld. The objective is to study the effect of pressure on welding stress of high strength steel at different time periods. From the study we can find that no matter at the first half of welding or and the last half welding or at the cooling time apply the load have little effect to improve the stress. Only under the entire welding process that the distribution of residual stress can be greatly improved. The results show that the residual stresses of the welding workpiece under specific pressure throughout the welding process decreased by 16.2% when compared with weld group without load applied. The maximum residual stresses of weld group without load applied are more than with the specific pressure load plates 120 MPa. But under other times putting the load cannot be improved. This paper just presents a simulation results that have a certain guiding significance.
Highlights
With the development of steel production techniques, many kinds of structural steel are produced and employed in many constructions, especially like high strength steel
They found that S690 showed good resistance to low temperature Heating, serious deterioration in strength would occur at higher temperatures
By comparing Models 2 and model 3 or model 4, it can be found that applying a compressive load during the first half of the weld or in the second half or between the end of the weld and the cooling to the Ac3 temperature can’t improve the stress distribution
Summary
With the development of steel production techniques, many kinds of structural steel are produced and employed in many constructions, especially like high strength steel. Chiew et al [3] have studied the mechanical properties of heat-treated S690 under fire/post-fire conditions. They found that S690 showed good resistance to low temperature (below 400 °C) Heating, serious deterioration in strength would occur at higher temperatures. Liang et al [9] through an experimental to evaluate the tension behaviour of welded high strength steel Tstub joint They found that when the flange boundary condition close to supported or fixedly supported, it will have the effect on the initial stiffness of the joint. There is little study about the effect on the property of high strength steel applying different loads during the weld. This paper uses the finite element analysis software to study effect of applied load on welding stress at different time periods
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