What is the joining of metals by applying pressure and passing current for a length of time through the metal area which is to be joined?

What is the joining of metals by applying pressure and passing current for a length of time through the metal area which is to be joined?

• A. Brazing
• B. Soldering
• C. Resistance welding
• D. Friction welding

Answer: (C)

This questions tests understanding of resistance welding. In this method, metal parts are pressed together and an electric current is passed through the joint area. The electrical resistance at the contact surfaces heats up the metal (I^2R heating), causing it to fuse under the applied pressure and form a weld as it cools. The pressure ensures intimate contact and helps shape a solid bond as the heated metal solidifies. This is different from brazing or soldering, which rely on a filler metal that melts and flows into the joint without melting the base metals, and from friction welding, which uses heat from sliding contact rather than electrical resistance. So the described joining method is resistance welding.

This questions tests understanding of resistance welding. In this method, metal parts are pressed together and an electric current is passed through the joint area. The electrical resistance at the contact surfaces heats up the metal (I^2R heating), causing it to fuse under the applied pressure and form a weld as it cools. The pressure ensures intimate contact and helps shape a solid bond as the heated metal solidifies. This is different from brazing or soldering, which rely on a filler metal that melts and flows into the joint without melting the base metals, and from friction welding, which uses heat from sliding contact rather than electrical resistance. So the described joining method is resistance welding.