Deck 16: Gas Tungsten Arc Welding

Question 1

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

Answer 1

False

Question 2

Autogenous welds work best on flare, outside corner, and lap joints because as the metal is melted, it can more easily flow together than it would on butt and tee joints.

Answer 2

True

Question 3

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

Answer 3

True

Question 4

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

Question 5

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

Question 6

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.

Question 7

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

A) aluminum
B) stainless steel
C) mild steel
D) low carbon

Question 8

When tiny pockets of primarily ____ gas get hot and expand, they can cause weld porosity.

A) carbon
B) oxygen
C) carbon monoxide
D) carbon dioxide

Question 9

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

Question 10

It is desirable to take the time and necessary precautions to make welds that are no darker than ____.

A) dark blue
B) tan
C) brown
D) purple

Question 11

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

A) low carbon
B) aluminum
C) mild steel
D) stainless steel

Question 12

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.

Question 13

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.

Question 14

Low carbon and ____ are two basic steel classifications.

A) stainless steel
B) mild steel
C) aluminum
D) tungsten

Question 15

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

A) edge
B) square butt
C) tee
D) butt

Question 16

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

A) pushing a puddle
B) striking an arc
C) pushing an arc
D) starting a puddle

Question 17

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.

A) butt
B) square butt
C) edge
D) tee

Question 18

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.

A) pushing a puddle
B) pushing an arc
C) starting a puddle
D) starting an arc

Question 19

The point on a tungsten is usually ground so that it is ____ as long as the diameter of the tungsten.

A) half
B) equally
C) twice
D) three times

Question 20

Higher welding speeds are an advantage of autogenous welds.

Question 21

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

Question 22

____________________ 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.

Question 23

____________________, sometimes called stringer beads, should be uniform in width and reinforcement while having minimum penetration.

Question 24

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

Question 25

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