Review Questions - SAW Flashcards
Sub Arc Welding
Submerged arc fluxes can add alloying to the deposit. Which type of flux can be used for the addition of alloying elements?
- re-ground flux
- fused flux
- active flux
- neutral flux
active flux
To increase arc length when SAW welding:
- use a longer contact tip
- increase wire feed speed
- increase arc voltage
- use shorter tip-to-work distance
increase arc voltage
When selecting a power source for SAW, what duty cycle is generally recommended?
- 20%
- 40%
- 60%
- 100%
100%
How is the weld pool protected from the atmosphere when submerged arc welding?
- the pool is under water
- with active shielding gases
- with a bed of flux
- with neutral slags
with a bed of flux
Which polarity produces deeper penetration?
- DCEN
- DCEP
- ACHF
- AC
DCEP
There are several types of SAW fluxes. Which type flux can be reused?
- bonded
- active
- fused
- ground
fused
Why would you select a large diameter single electrode set up over a small diameter twin wire arrangement?
- for deeper penetration
- for wider groove joints
- for reduced dilution levels
- for use with active fluxes
for deeper penetration
Bonded SAW fluxes can pick up moisture. Exposed fluxes should be:
- discarded
- re-dried
- saved
- used as they are
re-dried
Submerged arc welding can be used in different modes. Which mode is best for producing fillet welds?
- Constant voltage
- constant current
- variable current
- variable wire feed
Constant voltage
Which wire feeder set-up is used with SAW in constant-voltage mode?
- constant speed
- arc pulse sensing
- variable current
- voltage-sensing
constant speed
To increase bead width with SAW:
- use a longer contact tip
- increase wire feed speed
- increase arc voltage
- use a shorter contact tip
increase arc voltage
When using SAW, an increase in tip-to-work distance:
- reduces penetration
- increases penetration
- increases bead width
- increases flux consumption
reduces penetration
What is an advantage of using alternating current when submerged arc welding?
- increases penetration
- increases deposition
- minimizes arc blow
- increases electrode wander
minimizes arc blow
Which wire feeder set-up is used with SAW in constant-current mode?
- constant speed
- arc pulse sensing
- variable current
- voltage-sensing
voltage-sensing
When using tandem electrodes, why is one electrode operated in DC and the other in AC?
- faster production rates can be achieved
- reduce porosity ans slag inclusion between interpasses
- prevent arc blow caused by magnetic interaction between electrodes
- increase tensile strength in finished weld
prevent arc blow caused by magnetic interaction between electrodes
