What does Squeeze-Type Resistant Spot Welding (STRSW) involve?

Squeeze-Type Resistant Spot Welding (STRSW) involves the process of welding metal pieces together by applying a combination of high electric current and pressure. This technique is significant in automotive and manufacturing industries because it allows for the efficient joining of various metal components without the need for filler materials or extensive preparations.

In STRSW, the metal pieces are clamped together using electrodes that apply pressure. When the electric current flows through the metals, it generates heat due to resistance, leading to melting at the contact point and ultimately forming a weld once the current is cut off and the pressure is maintained briefly to solidify the joint. This method is particularly effective for joining thin sheets of steel or aluminum, as it creates strong, localized welds with minimal distortion to the surrounding material.

The other options detail processes that do not utilize the same principles involved in STRSW. For instance, layering metal pieces without applying heat does not lead to any permanent connection, and using adhesives or mechanical fastening methods does not involve the fusion of metals through heat and pressure, which is the key characteristic of spot welding.