Exam 15: Gas Tungsten Arc Welding Equipment and Materials

Preflow is the time during which gas flows to clear out any air in the nozzle or surrounding the weld zone.

____ is the time during which the gas continues flowing after the welding current has stopped.

Air-cooled torches have just the shielding gas hose that needs to be connected to the welding machine or ____________________.

Cerium oxide (CeO₂) is added to tungsten to improve the current-carrying capacity in the same manner as does ____.

The longer a nozzle, the longer the tungsten must be extended from the ____.

One advantage of air-cooled GTAW torches is continuous operation without overheating.

The term TIG is short for tungsten ____________________ welding.

Pure tungsten has ____ heat resistance and electron emission characteristic ____ all the tungsten electrodes.

The cleaning action by electrons leaving the surface of the metal is most important when welding on ____.

If tungsten is struck sharply, it will break without bending.

Four major components make up a GTA welding station: the welding power supply, the welding torch, the work clamp, and the ____________________.

The gas tungsten arc welding (GTAW) process is sometimes referred to as TEG.

The welding power supply is often called the ____.

The speed at which current changes back and forth is referred to by three different names that all mean the same thing-cycles, frequency, or ____________________.

High gas flow rates waste shielding gases.

GTA welding is efficient for welding metals ranging from sheet metal up to 1/2 in.

The advantages of water-cooled torches make them the preferred GTA welding torch type for most small shops.

The time of postflow is determined by the welding current and the ____.

Helium has been mixed with ____ to gain the combined benefits of cathode cleaning and deeper penetration, particularly for manual welding.

A grinder is often used to clean a contaminated tungsten.