The dual-phase titanium reactor is mainly used in the state of heat strengthening. However, the high strength of the titanium reactor is not always maintained in the component. First of all, this is because the plasticity of the welded joint is reduced after heat treatment strengthening. Secondly, due to the poor hardenability of titanium reactors, when large components or components with large thickness parts are quenched, the situation is quite complicated.
In order to obtain high structural strength of the component, the titanium reactor should be heat-treated and strengthened, and then the welding and local annealing of the welded joints should be performed. At this time, the weld should be thickened. The sequence of welding and heat treatment can be carried out as follows: quenching-aging-welding-partial annealing; quenching-welding-aging.