Welding

Question 1

In gas tungsten arc (GTA) welding, a stream of inert gas is used to:
A. Prevent the formation of oxides in the puddle.
B. Concentrate the heat of the act and prevent its dissipation.
C. Lower the temperature required to properly fuse the metal.

Answer 1

A. Prevent the formation of oxides in the puddle.

Question 2

Which statement best describes magnesium welding?
A. Magnesium can be welded to other metals.
B. Filler rod should be nickel-steel.
C. Filler rod should be the same composition as base metal.

Answer 2

C. Filler rod should be the same composition as base metal

Question 3

Which statement best describes magnesium welding?
A. It has low thermal conductivity, so distortion and cracking rarely occur.
B. It is recommended to use larger welding beads and a slower welding speed than normal.
C. It can be welded successfully using the same type of joints that are used for aluminum.

Answer 3

C. It can be welded successfully using the same type of joints that are used for aluminum.

Question 4

Which statement is true in regard to welding heat treated magnesium?
A. The welded section does not have the strength of the original metal.
B. Flux should not be used because it is very difficult to remove and is likely to cause corrosion.
C. Magnesium cannot be repaired by fusion welding because of the high probability of igniting the metal.

Answer 4

A. The welded section does not have the strength of the original metal.

Question 5

The oxyacetylene flame for silver soldering should be:
A. Oxidizing.
B. Neutral.
C. Carburizing.

Answer 5

B. Neutral.

Question 6

Why is it necessary to use flux in all silver soldering operations?
A. To chemically clean the base metal of oxide film.
B. To prevent overheating of the base metal.
C. To increase heat conductivity.

Answer 6

A. To chemically clean the base metal of oxide film.

Question 7

Engine mount members should preferably be repaired by using a:
A. Larger diameter tube with fish mouth and no rosette welds.
B. Larger diameter tube with fish mouth and rosette welds.
C. Smaller diameter tube with fish mouth and rosette welds.

Answer 7

B. Larger diameter tube with fish mouth and rosette welds.

Question 8

What method of repair is recommended for a steel tube longer on dented at a cluster?
A. Welded split sleeve.
B. Welded outer sleeve.
C. Welded patch plate.

Answer 8

C. Welded patch plate.

Question 9

Welding over brazed or soldered joints is:
A. Not permitted.
B. Permissible for mild steel.
C. Permissible for most metals or alloys that are not heat treated.

Answer 9

A. Not permitted.

Question 10

Which statement concerning soldering is correct?
A. Joints in electric wire to be soldered should be mechanically secure prior to soldering.
B. Changeable shades of blue can be observed on the surface of a copper soldering tip when the proper temperature for soldering has been reached.
C. If the soldering temperature is too high, the solder will form in lumps and not produce a positive bond.

Answer 10

A. Joints in electric wire to be soldered should be mechanically secure prior to soldering.

Question 11

A resurfaced soldering iron cannot be used effectively until after working face has been:
A. Fluxed.
B. Polished.
C. Tinned.

Answer 11

C. Tinned.

Question 12

Which of the following can normally be welded without adversely affecting strength?
A. Spring steel struts or aircraft bolts.
B. Most heat-treated steel/nickel alloy components.
C. SAE 4130 chrome/molybdenum tubing.

Answer 12

C. SAE 4130 chrome/molybdenum tubing.

Question 13

In selecting a torch tip size to use in welding, the size of the tip opening determines the:
A. Amount of heat applied to the work.
B. Temperature of the flame.
C. Melting point of the filler metal.

Answer 13

A. Amount of heat applied to the work.

Question 14

Why should a carburizing flame be avoided when welding steel?
A. It removes the carbon content.
B. It hardens the surface.
C. A cold weld will result.

Answer 14

B. It hardens the surface.

Question 15

The most important consideration(s) when selecting welding rod is:
A. Current setting or flame temperature.
B. Material compatibility.
C. Ambient conditions.

Answer 15

B. Material compatibility.

Question 16

When selecting a welding rod, one of the most important factors to consider is to ensure that:
A. Ferrous rods are used on aluminum.
B. The proper AMS number used.
C. Non ferrous rods are used on steel.

Answer 16

B. The proper AMS number used.

Question 17

The oxyacetylene flame used for aluminum welding should:
A. Be neutral and soft.
B. Be slightly oxidizing.
C. Contain an excess of acetylene and leave the tip at a relatively low speed.

Answer 17

A. Be neutral and soft.

Question 18

A very thin and pointed tip on a soldering copper is undersirable because it will:
A. Transfer to much heat to the work.
B. Have a tendency to overheat and become brittle.
C. Cool too rapidly.

Answer 18

C. Cool too rapidly.

Question 19

Filling or grinding a weld bead is considered to be:
A. An acceptable means to achieve a smoother surface.
B. A way to bring about strength reduction in joint.
C. Frequently necessary to avoid adding excessive weight to a weld joint.

Answer 19

B. A way to bring about strength reduction in joint.

Question 20

Acetylene at a line pressure above 15 PSI is:
A. Dangerously unstable.
B. Used when reducing flame is necessary.
C. Usually necessary when welding metal over 3/8-inch thick.

Answer 20

A. Dangerously unstable.

Question 21

Cylinders used to transport and store acetylene:
A. Are pressure tested to 3,000 psi.
B. Are green on color.
C. Contain acetone.

Answer 21

C. Contain acetone.

Question 22

A welding torch backfire may be caused by:
A. A loose tip.
B. Using to much acetylene.
C. A tip temperature that is too cold.

Answer 22

A. A loose tip.

Question 23

Which statement concerning a welding process is true?
A. The inert-arc welding process uses an inert gas to protect the weld zone from the atmosphere.
B. In the metallic-arc welding process, filler material, if needed, is provided by a separated metal rod of proper material held in the arc.
C. In the oxyacetylene welding process, the filler rod used for steel is covered with a thin coating of flux.

Answer 23

A. The inert-arc welding process uses an inert gas to protect the weld zone from the atmosphere.

Question 24

Where should the flux be applied when oxyacetylene welding aluminum?
A. Painted only on the surface to be welded.
B. Painted on the surface to be welded and applied to the welding rod.
C. Applied only to the welding rod.

Answer 24

B. Painted on the surface to be welded and applied to the welding rod.

Question 25

What purpose does flux serve in welding aluminum?
A. Removes dirt, grease, and oil.
B. Minimizes and prevents oxidation.
C. Ensures proper distribution of the filler rod.

Answer 25

B. Minimizes and prevents oxidation.

Question 26

Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
A. Reduces internal stresses and assures more complete penetration.
B. Reduces welding time.
C. Prevents corrosion and ensure proper distribution of the flux.

Answer 26

A. Reduces internal stresses and assures more complete penetration.

Question 27

How should a welding torch flame be adjusted to weld stainless steel?
A. Slightly carburizing.
B. Slightly oxidizing.
C. Neutral.

Answer 27

A. Slightly carburizing.

Question 28

Oxides from very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use:
A. Solvent.
B. Filler.
C. Flux.

Answer 28

C. Flux.