- What type of weld joint must be used to weld magnesium?
Butt welds
- Why must all flux be removed from the metal after welding magnesium?
Flex left will cause severe corrosion
- What must be done to successfully weld titanium?
Inert gas shield work zone
(Inert gas Helium or Argon)
- What is gas shielded arc welding?
Gas covers the weld to protect from atmosphere
- What are the advantages of gas shielded arc welding?
Stronger weld, more ductile, corrosion resistant weld
- What shielding gasses are used for gas tungsten arc (TIG) welding?
Helium or Argon
- What determines the amount of hear that will be applied to the work when welding by the oxyacetylene method?
Torch tips orifice size or diameter
- What is meant by a soft flame?
torch flame is adjusted to make no noise & doesn’t push the weld
- When gas welding, what should be turned off first?
“A” before “O”
Acetylene before oxygen
- What will be the result of using a torch tip that is too large or too small.
Too large - heat will be too great
Too small - heat wont penetrate
- What is the function of flux when used in soldering?
Flux erodes corrosion from surface and creates strong bond
- Why must acid core solder never be used on electrical wire?
Acid flux causes severe corrosion to the wire
- What is the advantages of gas shielded arc welding over gas welding?
Less buckling & warping
- What is brazing?
Material bonding process that uses non ferrous metal (lower temp) to join metal
- What is one method of controlling expansion when welding a joint?
Tack weld at intervals along the joint
- Why is it especially desirable to use a soft flame when welding aluminum?
Avoid blowing holes in metal when puddle is formed
- What fuel is used for gas welding aluminum?
Oxygen & hydrogen
- What is the purpose of using flux when welding aluminum?
Remove aluminum oxide by chemically combining it
- What is the maximum safe pressure for acetylene gas when welding?
15psi
- How can dents at a steel tube cluster joint be repaired?
Weld a specially formed steel patch over dented area & tubes
- What type of flame should the used when silver soldering?
Neutral
- What are the procedures for preparing a metal fuel tank for welding?
Wash with hot water & detergent
Steam cleaned least 30 min
Fill with CO2 gas & seal tank except small vent hole
- When splicing tubing by the inner sleeve method, what method can be used to insert a tight-fitting inner sleeve into the replacement tube?
Chill inner sleeve
Heat outer sleeve
- Why is flux used on silver solder?
Cleans base metal of oxide ensures good bond
- Name some types of welding?
Oxyacetylene
Gas shielded
Brazing
Arc
Plasma
- How do you determine the correct size filler rod to be used in welding?
Diameter of rod governed by thickness of metals
