This test focused on evaluating the stress variation of an aluminum alloy housing during heating and cooling processes. The aluminum housing and internal connector assembly were fixed together by utilizing the difference in thermal expansion coefficients between the aluminum housing and the connector.

At room temperature, the connector assembly was placed and fixed inside the aluminum housing fixture, after which the assembly was transferred to a constant-temperature platform and heated to 250 °C. Solder was applied between the housing and the connector (with pre-coated solder on the connector surface). After the solder fully melted, the aluminum housing was removed and allowed to cool naturally.

Throughout the thermal cycle, strain and temperature data were synchronously recorded to analyze stress evolution in the aluminum alloy housing during both heating and cooling stages.