Exam 31: Oxyfuel Welding and Cutting Equipment, Setup, and Operation

The torch pressure is always ____ the working pressure shown on the gauge.

The injector allows oxygen at the higher pressure to draw the fuel gas into the chamber even when the fuel gas pressure is as low as ____.

​In some cylinders a(n) ____________________ tube is used to improve the mixing of the gas by causing the liquid to be agitated as it is used.

​The ____________________ or rate of propagation of a flame is the speed at which the flame burns.

​An infrared analysis or ____________________ of the flame gives the highest temperature in the flame.

What is backfire and what are its causes?

​____________________ filler metals are welding rods that are mainly iron.

Gauges that do not read ____ when the pressure is released must be repaired or replaced.

​Explain what happens, on the molecular level, in the primary and secondary combustion of acetylene.

​Acetylene is produced by mixing ____.

​What are the properties of class RG65 welding rods?

​____________________ gas is mostly methane and ethane.