Airframe Structures: Welding 🔊 Flashcards
What type of weld joint must be used to weld magnesium?
Butt weld
Why must all flux be removed from the metal after welding magnesium?
Any flux left will cause severe corrosion
What must be done to successfully weld titanium?
The weld zone must be shielded with an inert gas, such as Helium or Argon.
What is gas shielded arc welding?
A gas is used as a covering shield around the arc to prevent the atmosphere from contaminating the weld.
What are the advantages of gas-shielding arc welding?
It results in a stronger, more ductile, and more corrosion resistant weld.
What shielding gasses are used for gas tungsten arc (TIG) welding?
Helium and Argon
What is an advantage of electric arc welding over gas welding?
It causes less buckling and warping of the welded material.
What determines the amount of heat that will be applied to the work when welding by the oxyacetylene method?
The torch tips orifice size or diameter
What is meant by a soft flame?
It is when the torch is adjusted so the flame makes no noise and doesn’t push the weld puddle.
When gas welding, what should be turned off first?
First shut off the acetylene, then the oxygen source.
What will be the result of using a torch tip that is too large or too small?
If the torch tip is too large, the heat will be too great, and holes may be burned in the metal. If the torch tip is too small, it will provide insufficient heat to penetrate the proper depth of the weld.
How do you determine the correct size filler rod to be used in welding?
It is determined by the thickness of the metals being joined.
What is the function of flux when used in soldering?
Flux erodes corrosion from the surface of metal so the solder can form a strong bond.
Why must acid-core solder never be used on electrical wire?
Any acid flux that is left over will cause severe corrosion to the wire.
What is one method of controlling expansion when welding a joint?
Tack welding at intervals along the joint.
Why is it especially desirable to use a soft flame when welding aluminum?
To avoid blowing holes in the metal when the puddle is formed.
What fuel is used for gas welding aluminum?
Oxygen and hydrogen.
What is the purpose of flux welding aluminum?
It is designed to remove the aluminum oxide by chemically combining with it.
What is the maximum safe pressure for acetylene gas when welding?
15 psi
How can dents at a steel tube cluster joint be repaired?
Weld a specially formed steel patch over the dented area and surrounding tubes.
What type of flame should be used when silver soldering?
A neutral flame
What are the procedures for preparing a metal fuel tank for welding?
The tank interior should be washed with hot water and detergent, then steamed for a minimum of 30 minutes. The tank should then be filled with CO2 gas from a fire extinguisher and sealed except for a small vent hole.
When splicing tubing by the inner sleeve method, what method can be used to insert a tight-fitting inner sleeve into a replacement tube?
The inner sleeve can be chilled and the outer tube heated.
What is brazing?
It is a metal joining process in which the bonding material is a non-ferrous metal with a melting point lower than that of the metals being used. It is used to join metals that are damaged by high heat.
Why is flux used on silver solder?
It cleans the base metal of oxide to ensure a good bond.
Name some types of welding.
Oxyacetylene, Gas shielded, Brazing, Arc, Plasma.
