Welding Flashcards
In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to
Prevent the formation of oxide in the puddle
Which statement best describes magnesium welding?
Filler rod should be the same composition as base metal
Which statement is true in regard to welding heat-treated magnesium?
The weld section does not have the strength of 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 of oxide film
Engine mount 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 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
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.
2
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 consideration(s) when selecting welding rod is
Material compatibility
The oxyacetylene flame used for aluminum welding should
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 weld bead
Reduces the strength of the joint
Acetylene at a line pressure above 15 PSI is
Dangerously unstable
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 welded and applied to the welding rod
What purpose does flux serve in welding aluminum?
Minimize or prevent oxidation
Why are aluminum plates 1/4 inch or more thick usually preheated before welding?
Reduces internal stresses and assures more 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
Oxygen and acetylene cylinders are made of
Steel
When a butt welded joint is visually inspected for penetration,
The penetration should be 100 percent of the thickness of the base metal
Annealing of aluminum
Remove stresses caused by forming
Edge notching is generally recommended in butt welding above a certain thickness of aluminum
because it
Aids in full penetration of the metal and prevents local distortion
If too much acetylene is used in the welding of stainless steel,
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
Helium or argon or a mixture of helium and argon
