A model for dissolution, solidification and first solid / solid transformation is proposed. The model explains mechanism of above processes that precedes the final stage of homogenisation required by the technology. Transformation of the liquid filler metal into its liquid solution is described as a phenomenon necessary for the formation of sub-layers within the interconnection. Transition from the initial stable solidification into the final metastable solidification is explained. The connection between period of solidification and first solid / solid transformation is considered. The birth of coupled phase on the surface of dominant phase of the joint is observed. It allows the explanation of the sequence of phases appearance to be delivered. The thermodynamic justification for the mentioned sequence is shown, additionally.

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