1. AWS groups welding processes based primarily on ?
Answer: Mode of energy trans-fer, and the influence of capillary action in the effecting
distribution of filler metals inthe joint
2. AWS defines welding as?
Answer: A joining process producing coalescence of materialsby heating them the welding
temperature with, or without the application of pressure or by the application of pressure
alone, and without or without the use of filler metal.
3. AWS welding processes are grouped into which major following categories.
Answer: ARC welding (AW), Solid state welding (SSW), Resistence welding(RW), Oxyfuel
gas welding(OFW), Soldering(S), Brazing(B), other welding welding, Alliedprocesses (such
as cutting and thermal spray.)
4. What are the 2 main methods of ARC shielding welding?
Answer: Flux shielding, Gasshielding
5. Which elements don't conduct any electricity at room temp?
Answer: Oxygen, Nitro-gen and Carbon Dioxide
6. How is a welding ARC formed?
Answer: High Current is forced to flow across a gapbetween 2 electrodes at relatively low
voltage
7. Does ARC welding require application of pressure to cause fusion?
Answer: No
8. What would be 2 examples of Autogenous weld?
Answer: Gas Tungsten ARC &Electron Beam welding
9. Is filler metal used in Autogenous weld?
Answer: No
10. All the electrical energy supplied by the power source is convered into?
Answer: -Heat (current * voltage)
11. ARC efficiency for some of the commonly used ARC welding processes is
?
Answer: Submerged arc welding (90-95%)
Shielded metal arc, gas metal and flux cored arc welding (65%-85%)
Gas tungsten arc welding (20-45%)
, 12. Higher arc efficiency usually means for a given arc energy?
Answer: A greateramount of weld metal is deposited and the work piece cools at a
comparativelyslowly rate.
13. What are the 4 steps in any welding setup of the continuous drop in voltagefrom the lower
most point of contact to the work piece?
Answer: There is a drop in voltage over the electrode extension,
the volt drop over the arc length,Next to the cathode spots are small thin gaseous regions called
the anode drop zoneand cathode drop zone,
Between the 2 drop zones there is a arc column with a relatively small drop involtage.
14. Define Active Flux ?
Answer: (Submerged Arc Welding) A flux formulated to producea weld metal composition
dependent on the welding parameters, especially arc voltage.
15. Define Alloy?
Answer: A substance with metallic properties and composed of twoor more chemical
elements of which at least one is a metal
16. Define Alloy Flux?
Answer: (Submerged Arc Welding) A flux containing ingredientsreacting with the filler
metal to establish a desired alloy content in the weld metal
17. Define Alternating current ?
Answer: Current flow in an electrical circuit where its direction (and therefore direction of
electron flow) continually reverses itself, usuallyat a predetermined frequency. The positive
half and negative half of the AC sine wave together represent one complete cycle of
alternating current.
18. Define ARC Blow?
Answer: The deflection of an arc from its normal path due tomagnetic forces.
19. Define ARC Force?
Answer: The axial force developed by arc plasma
20. Define ARC Length?
Answer: The distance from the tip of the welding electrode to theadjacent surface of the weld
pool
21. Define Arc Plasma ?
Answer: A gas heated by an arc to at least a partially ionizedcondition, enabling it to conduct
an electric current
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