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33 Cards in this Set

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  • Back

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 arc and prevent its dissipation


C - lower the temperature required to properly fuse the metal


A - prevent the formation of oxides in the puddle

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


C - filler rod should be the same composition as base metal

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


A - the welded section does not have the strength of the original metal

The oxyacetylene flame for silver soldering should be


A - oxidizing


B - neutral


C - carburizing


B - neutral

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


A - to chemically clean the base metal of oxide film

Engine mount members should preferably be repaired by using a


A - larger diameter tube with fishmouth and norosette welds


B - larger diameter tube with fishmouth and rosette welds


C - smaller diameter tube with fishmouth and rosette welds


B - larger diameter tube with fishmouth and rosette welds


What method of repair is recommended for a steel tube longeron dented at a cluster?


A - welded split sleeve


B - welded outer sleeve


C - welded patch plate


C - welded patch plate

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


A - not permitted

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


A - joints in electric wire to be soldered should be mechanically secure prior to soldering

A resurfaced soldering iron cannot be used effectively until after the working face has been


A - fluxed


B - polished


C - tinned


C - tinned

Which of the following can normally be welded without adversely affecting strength?


1. aircraft bolts


2. SAE 4130 chrome/molybdenum tubing


3. spring steel struts


4. most heat-treated steel/nickel alloy components




A - 2 and 4


B - 1 and 3


C - 2


C - 2

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


A - amount of heat applied to the work

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


B - it hardens the surface

The most important consideration(s) when selecting welding rod it


A - current setting or flame temperature


B - material compatibility


C - ambient conditions


B - material compatibility

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


A - be neutral and soft

A very thin and pointed tip on a soldering copper is undesirable because it will


A - transfer too much heat to the work


B - have a tendency to overheat and become brittle


C - cool too rapidly


C - cool too rapidly

Filing 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


B - a way to bring about strength reduction in joint

Acetylene at a line pressure above 15 PSI is


A - dangerously unstable


B - used when a reducing flame is necessary


C - usually necessary when welding metal over 3/8 inch thick


A - dangerously unstable

Cylinders used to transport and store acetylene


A - are pressure tested to 3,000 PSI


B - are green in color


C - contain acetone


C - contain acetone

A welding torch backfire may be caused by


A - a loose tip


B - using too much acetylene


C - a tip temperature that is too cool


A - a loose tip

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 separate metal rod of the proper material held in the arc


C - in the oxyacetylene welding process, the filler rod used for steel is covered with a thing coating of flux


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

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


B - painted on the surface to be welded and applied to the welding rod

What purpose does flux serve in welding aluminum?


A - removes dirt, grease, and oil


B - minimizes or prevents oxidation


C - ensures proper distribution of the filler rod


B - minimizes or prevents oxidation

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 ensures proper distribution of flux


A - reduces internal stresses and assures more complete penetration

How should a welding torch flame be adjusted to weld stainless steel?


A - slightly carburizing


B - slightly oxidizing


C - neutral


A - slightly carburizing

Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use a


A - solvent


B - filler


C - flux


C - flux

In gas welding, the amount of heat applied to the material being welded is controlled by the


A - amount of gas pressure used


B - size of the tip opening


C - distance the tip is held from the work


B - size of the tip opening

High pressure cylinders used to transport and store acetylene must


A - be pressure tested to 3,000 PSI


B - be green in color


C - contain acetone


C - contain acetone


When a butt-welded joint is visually inspected for penetration,


A - the penetration should be 25 to 50 percent of the thickness of the base metal


B - the penetration should be 100 percent of the thickness of the base metal


C - look for evidence of excessive heat in the form of a very high bead


B - the penetration should be 100 percent of the thickness of the base metal

Annealing of aluminum


A - increases the tensile strength


B - makes the material brittle


C - removes stressed caused by forming


C - removes stressed caused by forming

Edge notching is generally recommended in butt welding above a certain thickness of aluminum because it


A - helps hold the metal in alignment during welding


B - aids in the removal or penetration of oxides on the metal surface


C - aids in getting full penetration of the metal and prevents local distortion


C - aids in getting full penetration of the metal and prevents local distortion

If too much acetylene is used in the welding of stainless steel,


A - a porous weld will result


B - the metal will absorb carbon and lose its resistance to corrosion


C - oxide will be formed on the base metal close to the weld


B - the metal will absorb carbon and lose its resistance to corrosion

The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consist of


A - a mixture of nitrogen and carbon dioxide


B - nitrogen or hydrogen, or a mixture of nitrogen and hydrogen


C - helium or argon, or a mixture of helium and argon


C - helium or argon, or a mixture of helium and argon