Chapter 37, Problem 1RQ

What are the two primary functions of the electrodes in resistance welding?

To determine

The two primary functions of the electrode used in the resistance welding.

Explanation of Solution

The electrode used in the resistance welding must be conductive in nature because it is used to supply the current to the materials being joined. When the current passes through the materials, due to contact resistance between them heat is generated in the material which raises the temperature at the junction (interface) of the two materials.

The electrode is also used to exert required pressure on the work-piece which varies throughout the weld cycle. Initially the pressure is applied to hold the work-pieces together and to maintain the resistance between them. When the required temperature is attained the pressure is used to induce coalescence (merging of the two materials as a one mass).