Which welding process uses end-to-end contact with flashing heating the ends?

• A. Flash Welding
• B. Projection Welding
• C. Upset Welding
• D. Arc Welding

Answer: (A)

In flash welding, the pieces are brought into end-to-end contact and clamped so their ends touch. A high current passes through the joint, and the electrical resistance at the ends heats those faces rapidly. Once the ends become plastic, they are forged together under pressure, forming a strong weld. The excess material at the seam is expelled as a characteristic flash around the joint. This flashing of material exactly describes the process, making it the correct choice.

Projection welding would heat at raised projections rather than the entire ends; upset welding relies on pressure and resistance heating along the joint without the distinctive flashing produced in flash welding; arc welding uses an arc to melt metal rather than forging the ends together with flashing.