Welding Flashcards
Why is it necessary to use flux in all silver soldering operations?
To chemically clean the base metal of oxide film.
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?
2 (SAE 4130 chrome/molybdenum tubing.
A very thin and pointed tip on a soldering coppper is undersiable because it will…?
cool to rapidly.
Filing or grinding a weld bead…?
reduces the strength of the joint.
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.
What purpose does the flux serve in welding aluminum?
Minimizes or prevents oxidation.
Oxides for very rapidly when alliys or metals are hot. It is important, therefore, when welding aluminum to use a…?
flux
When a butt welded joint is visually inspected for penetration,
the penetration should be 100 percent of the thickness of the base metal.
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.
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
Which statement best describes magnesium welding?
Filler rod should be the same composition as base metal.
Which statement is true regarding to welding heat-treated magnesium?
The welded section does not have the strength of the original metal.
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.
The oxyacetylene flame used for aluminum welding should…?
be neutral and soft.
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.
The most important consideration(s) when selecting welding rod is…?
material compatibility.
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.
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.
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.
If too much acetylene is used in the welding of stainless steel,
the metal will absorb carbon and lose its resistance to corrosion.
Where should the flux be applied when oxyacetylene welding aluminum?
Painted on the surface to be welded and applied to the welding rod.
Why should a carburizing flame be avoided when welding steel?
It hardens the surface.
The oxyacetylene flame for silver soldering should be…?
neutral.
Annealing of aluminum…?
removes stresses caused by forming.
Filing or grinding a weld bead is considered to be…?
a way to bring about strength reduction in joint.
Welding over brazed or soldered joints is…?
not permitted.
In Gas Tungsten ARC (GTA) welding, a stream of inert gas is used to…?
prevent the formation of oxides in the puddle.
