Nickel-iron type cast iron electrodes are widely used in welding QT600–3 nodular iron. In order to obtain the total field displacement, strain, and stress distribution of these welded joints under the critical fracture condition, a highly accurate elasto-plastic hybrid/mixed finite element method has been presented in this paper. Also, the corresponding plane stress element model has been given. In addition, this paper describes macro-imitation of the brittle structure in the welded joints. The calculated displacement results are in good agreement with the experimental measurement by using the Moiré fringe method. The reasons of fracture under the lower tensile stress are also discussed.
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