Welding Flashcards
In Gas Tungsten Arc welding, a stream of inert gas is used to
prevent the formation of oxides in the puddle
Which statement best describes magnesium welding?
Filler rod should be the same composition as base metal
It can be welded successfully using the same type of joints that are used for aluminum
What statement is true in regards to welding heat-treated magnesium?
The welded section does not have the same strength as the original metal
The oxyacetylene flame for silver soldering should be
neutral
Why is it necessary to use flux in all silver soldering operations?
To chemically clean the base metal of oxide film
Engine mounts members should preferably be repaired by using a
larger diameter tube with fishmouth and rosette welds
What method of repair is recommended for a steel tube longeron dented at a cluster?
Welded patch plate
Welding over brazed or soldered joints is
not permitted
Which statement concerning soldering is correct?
Joints in electric wires to be soldered should be mechanically secure prior to soldering
Silver, tin, and lead are used in electrical soldering for what reason?
Corrosion properties
A resurfaced soldering iron cannot be used effectively until after the working face has been
tinned
Which of the following can normally be welded without adversely affecting strength?
SAE 4130 chrome/molybdenum tubing
In selecting a torch tip size to use in welding, the size of the tip opening determines the
amount of heat applied to the work
Why should a carburizing flame be avoided when welding steel
It hardens the surface
The most important considerations when selecting welding rods are
material compatibility
When selecting a welding rod, one of the most important factors to consider is to ensure that
the proper AMS number is used
The oxyacetylene flame used for aluminum welding shoud
be neutral and soft
A very thin and pointed tip on a soldering copper is undesirable because it will
cool too rapidly
Filing or grinding a welding bead is considered
a way to bring about strength reduction in joint
Acetylene at a line pressure above 15PSI is
dangerously unstable
When moving acetylene tanks, what precautions should be observed?
Transport upright
Cylinders used to transport and store acetylene
contain acetone
A welding torch backfire may be caused by
a loose tip
Which statement concerning a welding process is true?
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?
Painted on the surface to be applied to the welding rod
What purpose does flux serve in welding aluminum?
Minimizes or prevents oxidation
Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
Reduces internal stresses and assures complete penetration
How should a welding torch flame be adjusted to weld stainless steel?
Slightly carburizing
Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use a
flux
In gas welding, the amount of heat applied to the material being welded is controlled by the
size of the tip opening
When welding or cutting, acetylene pressure gauge should never be set higher than
15 PSI (unstable)
Oxygen and acetylene cylinders are made from
steel
High pressure cylinders used to transport and store acetylene must
contain acetone
When a butt-welded joint is visually inspected for penetration
100% of the thickness of the base metal
Annealing of aluminum
removes the stresses caused by forming
Edge notching is generally recommended in butt welding above a certain thickness of aluminum because it
aids in getting full penetration of the metal and prevents local distortion
If too much acetylene is used in welding stainless steel
the metal will absorb carbon and lose resistance to corrosion
The shield gases generally used in Gas Tungsten Arc (GTA) welding of aluminum consist of
helium or argon or a mixture of helium and argon
