In automated spin welding, which action helps control excessive flash?

• A. Increase speed.
• B. Decrease clamping pressure.
• C. Increase clamping pressure.
• D. Decrease temperature.

Answer: (C)

In automated spin welding, flash forms when molten plastic is pushed out of the joint as the pieces are pressed together and rotated. The amount of flash is influenced by how much the parts are clamped and how much heat is generated. Increasing clamping pressure tightens the joint, reduces the gap, and confines the molten material so more of it stays in the weld zone rather than escaping as flash. It helps you achieve a cleaner weld with less extruded plastic. Conversely, using higher speed would raise heat and typically increase flash, lowering clamping pressure would allow more material to flow out, and lowering temperature reduces heat but can weaken the weld rather than reliably controlling flash.