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5 Welding

QuestionAnswer
Which of the following can normally be welded without adversely affecting strength? SAE 4130 chrome/molybdenum tubing.
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.
A resurfaced soldering iron cannot be used effectively until after the working face has been tinned
High pressure cylinders used to transport and store acetylene must contain acetone.
Which statement best describes magnesium welding? It can be welded successfully using the same type of joints that are used for aluminum.
Oxygen and acetylene cylinders are made of steel.
Which statement best describes magnesium welding? Filler rod should be the same composition as base metal.
What method of repair is recommended for a steel tube longeron dented at a cluster? Welded patch plate.
Annealing of aluminum removes stresses caused by forming.
When welding or cutting, the acetylene pressure gauge should never be set higher than 15 psi.
Why are aluminum plates 1/4 inch or more thick usually preheated before welding? Reduces internal stresses and assures more complete penetration.
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.
A very thin and pointed tip on a soldering copper is undesirable because it will cool too rapidly.
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.
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.
When selecting a welding rod, one of the most important factors to consider is to ensure that the proper AMS number is used.
How should a welding torch flame be adjusted to weld stainless steel? Slightly carburizing.
Cylinders used to transport and store acetylene contain acetone.
Where should the flux be applied when oxyacetylene welding aluminum? Painted on the surface to be welded and applied to the welding rod.
In gas welding, the amount of heat applied to the material being welded is controlled by the size of the tip opening.
Engine mount members should preferably be repaired by using a larger diameter tube with fishmouth and rosette welds.
Oxides form very rapidly when alloys or metals are hot. It is important, therefore, when welding aluminum to use a flux.
A welding torch backfire may be caused by a loose tip.
Why is it necessary to use flux in all silver soldering operations? To chemically clean the base metal of oxide film.
Which statement is true in regard to welding heat-treated magnesium? The welded section does not have the strength of the original metal.
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.
Acetylene at a line pressure above 15 psi is dangerously unstable.
In Gas Tungsten Arc (GTA) welding, a stream of inert gas is used to prevent the formation of oxides in the puddle.
If too much acetylene is used in the welding of stainless steel, the metal will absorb carbon and lose its resistance to corrosion.
What purpose does flux serve in welding aluminum? Minimizes or prevents oxidation.
The oxyacetylene flame used for aluminum welding should be neutral and soft.
Which statement concerning soldering is correct? Joints in electric wire to be soldered should be mechanically secure prior to soldering.
The most important consideration(s) when selecting welding rod is material compatibility.
Why should a carburizing flame be avoided when welding steel? It hardens the surface.
When a butt-welded joint is visually inspected for penetration, the penetration should be 100 percent of the thickness of the base metal.
The oxyacetylene flame for silver soldering should be neutral.
Created by: Jack Mollohan
 

 



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