The mutual nonlinear propagation and distortion of two plane waves interacting at arbitrary angles has been analyzed on the basis of the nonlinear wave equation governing the velocity potential. A perturbation approach is adopted for the solution. A uniformly valid solution, up to shock formation distance, for the acoustic pressure is obtained by utilizing the perturbation method of renormalization. The approach presented describes all the second order effects with the same degree of accuracy. Asymptotic trends for the paraxial approximation as well as for a high frequency limit of the first primary are derived. Relevance to earlier theory on scattering of sound by sound has been discussed.
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