Welding Flashcards
T/F
A certificated A&P mechanic is allowed to inspect welds.
True.
Only inspect.
What are indications of a good weld?
Evenly spaced ridges.
Smooth taper.
No spattering.
Built up weld (added thickness)
No shaving of weld.
What document is sent back with a part after a welding shop has performed a repair?
Form 8130
Two forms of welding:
Fusion.
Non-fusion.
Methods of Fusion welding:
Gas (oxyacetylene)
Electric arc
Electrical resistance.
Types of electric arc welding:
SMAW
MIG
TIG
Types of electrical resistance welding:
Spot
Seam
Methods of non-fusion welding:
Brazing.
Soldering.
What method uses a positive stick to a negative metal?
SMAW (stick)
What method of welding is used on very thin sheet metal?
Electrical resistance spot weld.
What is most damaging to a weld?
Inclusion of oxygen.
What must always be done when moving bottles?
Ensure that the cap is in place.
What is adjusted on an electric arc welder for different materials?
Amperage.
How much should the valve on the acetylene bottle be opened when in use?
About a quarter turn.
What safety precaution is taken to ensure there are no leaks from the screw fittings on valves and hoses?
Wipe soapy water on fittings and look for bubbling.
Define neutral flame:
A flame in which the ratio of oxygen and acetylene is correct and there is no excess of oxygen or carbon.
Rounded inner cone and no feather around it.
Three types of torch flames:
Neutral
Carburizing
Oxidizing
Define carburizing flame (reducing flame):
Flame produced by an excess of acetylene.
Feather around the inner cone.
Define oxidizing flame:
Flame in which there is an excess of oxygen.
Inner cone is pointed and a hissing sound is heard.
Welds commonly used in aircraft construction:
Butt joint.
Lap joint.
Fillet (T).
Rosette weld.
Butt weld required penetration:
100% thickness of base material.
Fillet weld required penetration:
25-50% thickness of base metal.
Primary method of joining heavy steel:
Electric arc welding.
What type of application utilizes both lap and rosette welds.
Fishmouth