Introduction:
When two different metallic strips are joined together and heated to the same temperature, several phenomena can occur due to the differences in their properties.

Thermal Expansion:
- Both metals will expand at different rates due to their unique coefficients of thermal expansion.
- This can lead to the creation of stress at the junction of the two metals.

Thermoelectric Effect:
- When two different metals are joined together, a voltage difference can be generated at the junction due to the Seebeck effect.
- This can result in the generation of an electric current if a closed circuit is formed.

Alloy Formation:
- At high temperatures, the atoms of the two metals can diffuse into each other and form an alloy at the junction.
- This can alter the properties of the metals at the junction, such as electrical conductivity and strength.

Galvanic Corrosion:
- If the two metals have different electrochemical potentials, galvanic corrosion can occur when they are joined together.
- This can result in the degradation of one of the metals at the junction.

Conclusion:
In conclusion, when two different metallic strips are joined together and heated to the same temperature, various phenomena can occur due to the differences in their properties. It is important to consider these factors when designing systems involving multiple metals to ensure their proper functioning and longevity.