The utilization of the welded bond joint process for aluminum ship structures gives the advantages of the light weight design, an improvement of the fatigue properties and the good toughness for a shock load. In this paper, results from an experimental and theoretical study of the welded bond joint on tensile strength are reported. In the experimental investigation, tensile loading tests were conducted on the cross type welded bond test pieces. In the theoretical investigation, FEM analyses by use of the computer program MSC/DYTRAN for simulating the destruction of the weld bond joint were conducted. The nonlinear analysis accurately represented the behavior of the destruction mechanism of the cross type welded bond joint.