Exam 16: Gas Tungsten Arc Welding

The process of starting an arc involves melting a small spot of metal and is referred to as ____.

Some GTA welding filler metals have alloys in them called ____________________ that can help prevent porosity.

____________________ occurs in some stainless steels during welding when carbon combines with chromium.

The faster that the torch is moved across the metal's surface, the narrower the weld beads; slower travel speeds result in wider weld beads.

____________________ is the process of holding the file across the edge of the blade at a 90 degree angle and pulling or drawing the file toward you.

A problem with the gas tungsten arc welded ____ joint is trying to ensure that 100% of the root is fused.

To reduce the possibility of carbide precipitation, use as high a welding current setting as possible and/or travel as fast as possible along the joint to help reduce carbide precipitation.

The term ____ refers to the process of forming a molten weld pool and manipulating the GTA welding torch so that the molten weld pool is worked along the plate surface.

Turn off all power before attempting to stop any leaks in the water system.

Severe GTA welding porosity is usually only found when welds are being made by fusing the base metal together without adding filler metal.

The greatest difficulty with the ____ joint is that the filler metal can stick to the base metal's surface if it accidentally comes in contact with it as it is being fed into the molten weld pool.

The lower the welding current, the wider the weld bead, and the higher the welding current, the narrower the weld bead.

Welds with only slight oxide layers are better for multiple passes.

The high surface tension of molten ____ makes it easier to control large molten weld pools.

The surface of a mild steel weld will show the contamination effects of dirt, surface oxides, and inadequate shielding gas more easily than stainless steel.

The high thermal conductivity of ____ rapidly pulls the heat away from the welding area, making it more difficult to form a molten weld pool.

Higher welding speeds are an advantage of autogenous welds.

Low carbon and ____ are two basic steel classifications.

It is possible to determine the extent of contamination of a weld with a visual inspection alone.

The term ____________________ refers to a fusion weld made without the addition of filler metal.