Finite Element Analysis Of Residual Stress In The Repalr Weld Of A 304 Stainless Steel Clad Plate

Stainless steel clad plate is a composite materia l made of stainless steel and mild steel orlow alloy steel. It can be made by the explosion of two materia ls, rolling or rolling from anexplosion, which not only has base materia l's strength, stiffness and toughness , but also hasthe cladd ing materia ls's corrosion resista nce. Therefore stainless steel clad plate is widely usedin petroleum, chemica l and nuclear industries for its low price. In ma nufacturing or serviceprocess, there are some defects in the clad materia ls, such as cracks, incomplete fusion, andsla g. Weld ing repair is the ma in mea ns to repair these defects. However, due to the significa ntdifference of the mecha nical properties between the base and clad materia ls, large resid ualstress will inevitably generated in the weld ing process, which has a great effect on structureintegrity. Therefore, it is vital to study the weld ing resid ual stress in the repaire weld ofstainless steel clad plate.A sequential coupling thermal-elasto-plastic finite element procedure is developed tocalculate the resid ual stress in repair weld of 304 stainless steel clad plate, and the repair weldtemperature field and resid ual stress are obtained. And the effects of heat input, weld ing la yers,repair width and length on weld resid ual stress have been investigated. The results show thatthe heat affected zone has the ma ximum resid ual stress. Due to the materia l mismatchingbetween base meta l and clad meta l, discontinuous stress is generated across the interface,which has a great effect on crack. With the heat input increasing, the plastic strain has beenincreased to rela x some stresses, which results in decreasing the resid ual stress . The resid ualstress in the repaire weld is decreased with the weld la yer increasing. With an increasing ofrepair width, the resid ual stress is decreased, and a repair width of no less than 24 mm isrecommended. The resid ual stress is decreased with the repair length increasing, and a repairlength no less than 140mm is advised, which can reduce and control weld ing resid ual stress inthe repair weld ing.