Welding Flashcards
In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to…
Prevent the formation of oxides in the puddle.
What statement best describes magnesium welding?
Filler rod should be the same composition as base metal.
What statement is true in regard to welding heat-treated magnesium?
The welded section does not have the strength of the original metal.
What statement best describes magnesium welding?
It can be welded successfully using the same type of joints that are used for aluminum.
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 mount members should preferably be repaired 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.
What 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.
What 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 consideration(s) when selecting welding rod is…
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 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 is considered to be…
A way to bring about strength reduction in 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 cause by…
A loose tip.
What 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 flux serve in welding aluminum?
Minimizes or prevents oxidation.
Where should the flux be applied when oxyacetylene welding aluminum?
Painted on the surface to be welded and applied to the welding rod.
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 welding is controlled by the…
Size of the tip opening.
When welding or cutting, the acetylene pressure gauge should never be set higher than…
15 psi.
Oxygen and acetylene cylinders are made of…
Steel.
High pressure cylinders used to transport and store acetylene must…
Contain acetone.
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…
Removes 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 the welding of stainless steel,…
The metal will absorb carbon and lose it 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 or argon.
Why should an aircraft maintenance technician be familiar with weld nomenclature?
In order to gain familiarity with the welding technique, filler material, and temperature range used.
Identify the weld cause by an excessive amount of acetylene.
3
Select the illustration which depicts a cold weld.
2
Why is it considered good practice to normalize a part after welding?
To relieve internal stresses developed within the base metal.
Holes and a few projecting globules are found in a weld. What action should be taken?
Remove all the old weld, and reweld the joint.
Which condition indicates a part has cooled too quickly after being welded?
Cracking adjacent to the weld.
What is a characteristic of a good gas weld?
The weld should taper off smoothly into the base metal.
One characteristic of a good weld is that no oxide should be formed on the base metal at a distance from the weld of more than…
1/2 inch.
In examining and evaluating a welded joint, a mechanic should be familiar with…
Likely ambient exposure conditions and intended use of the part, along with type of weld and original part material composition.
What type weld is shown at A?
Butt.
What type weld is shown at B?
Double butt.
What type weld is shown at G?
Lap.
On a fillet weld, the penetration requirement includes what percentage(s) of the base metal thickness?
25 to 50 percent.
