Welding Flashcards
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.
Why is it necessary to use flux in all silver soldering operations?
To chemically clean the base metal of oxide film.
Which statement best describes magnesium welding?
Filler rod should be the same composition as base metal.
What purpose does flux serve in welding aluminum?
Minimizes or prevents oxidation.
A welding torch backfire may be caused by
A loose tip
A very thin and pointed tip on a soldering copper is undesirable because it will
Cool too rapidly
In selecting a torch tip size to use in welding, the size on the tip opening determines the
Amount of heat applied to the work
Where should the flux be applied when oxyacetylene welding aluminum?
Painted on the surface to be welded and applied to the welding rod.
How should a welding torch flame be adjusted to weld stainless steel?
Slightly carburizing
A resurfaced soldering iron cannot be used effectively until after the working face has been
Tinned
Cylinders used to transport and store acetylene
Contain acetone
Welding over brazed or soldered joints is
Not permitted
When selecting a welding rod, one of the most important factors to consider is to ensure that
The proper AMS specification number is used
Engine mount members should preferably be repaired by using a
Larger diameter tube with fish-mouth and rosette welds.
Filing or grinding a weld bead is considered to be
A way to bring about strength reduction in joint.
The most important consideration(s) when selecting welding rod is
Material compatibility
in gas welding, the amount of heat applied to the material being welded is controlled by the
Size of the tip opening
The shielding gases generally used in the Gas Tungsten Arc (GTA) welding of aluminum consists of
Helium or argon, or a mixture of helium and argon.
Which statement is true in regard to welding heat-treated magnesium?
The welded section does not have the strength of the original metal.
In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to
Prevent the formation of oxides in the puddle.
Why should a carburizing flame be avoided when welding steel?
It hardens the surface
High pressure cylinders used to transport and store acetylene must
Contain acetone
When welding or cutting, the acetylene pressure gauge should never be set higher than
15 PSI
Annealing of aluminum
Removes stresses caused by forming
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.
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
2
When a butt welded joint is visually inspected for penetration
100 percent of the thickness of the base metal
Acetylene at a line pressure above 15 PSI is
Dangerously unstable
Which statement best described magnesium welding?
It can be welded successfully using the same type of joints that are used for aluminum.
The oxyacetylene flame used for aluminum welding should be
Neutral
Which statement concerning soldering is correct?
Joints in electric wire tube soldered should be mechanically secure prior to soldering
Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
Reduces internal stresses and assures more complete penetration.
Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
Reduces internal stresses and assures more complete penetration.
If too much acetylene is used in the welding of stainless steel
The metal will absorb carbon and lose its resistance to corrosion.
Oxygen and acetylene cylinders are made of
Steel
What method of repair is recommended for a steel tube longeron dented at a cluster?
Welded patch plate
Oxides form very rapidly when alloys or metals are hot. it is important, therefore, when welding aluminum to use a
Flux
