Which nozzle material is described as clear?

Which nozzle material is described as clear?

• A. Fused quartz (clear)
• B. Alumina
• C. Silicon nitride
• D. Ceramic

Answer: (A)

Seeing through the nozzle is possible when the material is transparent to visible light, which lets you watch the arc and weld pool directly. Fused quartz is transparent, so it can be described as clear and is used in some torches to allow visual monitoring of the weld area, gas flow, and arc length. The other materials—alumina, silicon nitride, and ceramic—are opaque and chosen for strength and heat resistance, but they don’t allow visibility through the nozzle. That combination of transparency and usefulness for observation is why fused quartz is the clear choice.

Seeing through the nozzle is possible when the material is transparent to visible light, which lets you watch the arc and weld pool directly. Fused quartz is transparent, so it can be described as clear and is used in some torches to allow visual monitoring of the weld area, gas flow, and arc length. The other materials—alumina, silicon nitride, and ceramic—are opaque and chosen for strength and heat resistance, but they don’t allow visibility through the nozzle. That combination of transparency and usefulness for observation is why fused quartz is the clear choice.