In this paper the influence of 3 dimension multi-layer welding procedure on the welding residual stress of super-big diameter WHSJ(welded hollow sphere joint) in the large-span structure has been evaluated by finite element method. First, a conception of equivalent state change time in the analysis of welding was newly defined, which is the virtual time of state change, representing the absorbing or abstracting heat during state change process between solid and fluid of welding material. By considering of equivalent state change time in real welding and cooling time, the correctness of the thermal analysis was increased. Next, the simulation of three welding methods including single-layer symmetric welding, multi-layer sequential welding and multi-layer symmetric welding was carried out, which shows that multi-layer symmetric welding not only increases the balance of supporting ability of structure but also decreases the maximum tensile residual stress so that it is better than the other two methods.
Comments: 12 Pages.
[v1] 2018-02-21 18:32:44
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