Question

assignment #1: electric welding questions

1. what does gmaw stand for?

a) gas metal arc welding
b) grounded metal arc welding
c) gas micro arc welding
d) grounded micro arc welding

1. which gas is commonly used as a shielding gas in gmaw?

a) oxygen/carbon dioxide mix
b) nitrogen
c) argon/carbon dioxide mix
d) hydrogen/nitrogen mix

1. in gmaw, the electrode is typically made of:

a) copper
b) aluminum
c) tungsten
d) consumable wire

1. gmaws primarily used for welding which types of materials?

a) wood
b) plastics
c) metals
d) ceramics

1. what is the purpose of the shielding gas in gmaw?

a) to cool the weld pool
b) to prevent spatter
c) to protect the weld from atmospheric contamination
d) to increase electrical conductivity

1. which of the following is a common variation of gmaw used for welding aluminum?

a) fcaw
b) saw
c) gmaw-p
d) gmaw-a

Explanation:

1. GMAW is an abbreviation for Gas Metal Arc Welding.
2. Argon/carbon dioxide mix is a common shielding gas in GMAW as it provides good arc stability and weld quality.
3. In GMAW, the electrode is consumable wire which melts and becomes part of the weld.
4. GMAW is primarily used for welding metals as it is an arc - welding process suitable for metal joining.
5. The shielding gas in GMAW protects the weld from atmospheric contamination (e.g., oxygen, nitrogen) which can degrade weld properties.
6. GMAW - P (Pulsed Gas Metal Arc Welding) is a common variation used for welding aluminum as it allows better control of heat input.

Answer:

1. a) Gas Metal Arc Welding
2. c) Argon/carbon dioxide mix
3. d) Consumable wire
4. c) Metals
5. c) To protect the weld from atmospheric contamination
6. c) GMAW - P