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33 Cards in this Set
- Front
- Back
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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 |
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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 |
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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 |
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The oxyacetylene flame for silver soldering should be A - oxidizing B - neutral C - carburizing |
B - neutral |
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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 |
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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 |
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A - welded split sleeve B - welded outer sleeve C - welded patch plate |
C - welded patch plate |
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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 |
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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 |
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A resurfaced soldering iron cannot be used effectively until after the working face has been A - fluxed B - polished C - tinned |
C - tinned |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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How should a welding torch flame be adjusted to weld stainless steel? A - slightly carburizing B - slightly oxidizing C - neutral |
A - slightly carburizing |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
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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 |
