In an OAC torch, which tube contains oxygen for the cutting stream?

In an OAC torch, which tube contains oxygen for the cutting stream?

• A. Lowest tube
• B. Middle tube
• C. Highest tube
• D. There is no oxygen tube

Answer: (C)

In an oxy-acetylene cutting torch, the burning and cutting processes rely on separate gas passages inside the head. The cutting stream needs a clean, high-velocity supply of oxygen that exits right at the cutting jet to oxidize the metal and blow away slag. The torch is designed so the oxygen path runs through the uppermost tube in the head, delivering the oxygen directly to the cutting orifice. This placement helps keep the cutting oxygen isolated from the fuel preheat flame until it reaches the nozzle, ensures a stable jet, and prevents backflow. So the oxygen for the cutting stream goes through the highest tube.

In an oxy-acetylene cutting torch, the burning and cutting processes rely on separate gas passages inside the head. The cutting stream needs a clean, high-velocity supply of oxygen that exits right at the cutting jet to oxidize the metal and blow away slag. The torch is designed so the oxygen path runs through the uppermost tube in the head, delivering the oxygen directly to the cutting orifice. This placement helps keep the cutting oxygen isolated from the fuel preheat flame until it reaches the nozzle, ensures a stable jet, and prevents backflow. So the oxygen for the cutting stream goes through the highest tube.