What does the term "resistance welding" refer to?

The term "resistance welding" specifically refers to a process that joins metals by applying pressure and passing electric current through them. This method relies on the electrical resistance of the materials being joined, which generates heat when electric current flows. The heat produced is concentrated at the interface of the two metals, allowing them to be fused together effectively.

This technique is commonly used for welding thin sheets of metal and is particularly useful in applications where speed and precision are important, such as in the automotive industry. One of its advantages is that it does not require any filler materials, making it a clean and efficient process.

In contrast to other methods, resistance welding is distinct because it combines the mechanical pressure with electrical energy, unlike soldering, which typically relies on a filler metal and lower temperatures. It is also not applicable to plastics or limited to arc welding techniques, emphasizing its unique focus on metallic bonding through thermal resistance.