Stress-Strain State in the Joint Zone During Wedge-Press Welding of Dissimilar Materials

A computer simulation of the process of wedge-press welding of dissimilar materials is performed using titanium alloy and stainless steel with a nickel interlayer as an example. The initial model of the embedded part is a cylinder with a conical top, and the model of the corresponding part is a conical blind hole in the cylinder. The initial model of the nickel interlayer has the shape of a hollow cone 0.2 mm thick and is located between the parts to be joined. The differences between wedge-press welding at a constant deformation rate and at constant pressure are shown. When wedge-press welding at a constant deformation rate, the deformation is highly localized, which increases the probability of faulty fusion. In the case of wedge-press welding at constant pressure, the intensities of deformations and stresses in the interlayer are distributed more evenly, and the probability of formation of faulty fusion is considerably lower. The assembly II (embedded part made of titanium alloy) with an apex angle of the cone α = 90° is the most optimal assembly for wedge-press welding at constant pressure.

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