Q1: Material of construction of the electrode used in the electric resistance welding is

ANS:C - copper

Copper is a versatile metal that possesses several characteristics that make it suitable for various applications, including its use as an electrode material in electric resistance welding:

1. Excellent Electrical Conductivity: Copper is renowned for its outstanding electrical conductivity, surpassed only by silver among pure metals. This property allows copper electrodes to efficiently conduct electrical current during the welding process, facilitating the generation of heat at the weld interface.
2. Good Thermal Conductivity: In addition to its high electrical conductivity, copper also exhibits excellent thermal conductivity. This property enables copper electrodes to dissipate heat effectively, preventing excessive heating and potential damage to the welding equipment and workpieces.
3. Ductility: Copper is highly ductile, meaning it can be easily shaped and formed without fracturing. This characteristic is advantageous for manufacturing electrode shapes tailored to specific welding applications, ensuring optimal contact and current distribution during the welding process.
4. Corrosion Resistance: Copper possesses inherent corrosion resistance, particularly in non-aggressive environments. This resistance to corrosion helps maintain the integrity of copper electrodes over time, prolonging their service life and ensuring consistent welding performance.
5. Cost-Effectiveness: Copper is relatively abundant and cost-effective compared to other metals with similar conductivity properties, such as silver. This affordability makes copper electrodes a practical choice for electric resistance welding applications, balancing performance with cost considerations.

Overall, the combination of excellent electrical conductivity, thermal conductivity, ductility, corrosion resistance, and cost-effectiveness makes copper an ideal material for electrodes used in electric resistance welding processes. Its properties contribute to efficient and reliable welding operations, ensuring high-quality welds in a wide range of industrial applications.