1. An electrode tip that has mushroomed requires:
more current.
a longer hold time.
a shorter squeeze time.
less force.
2. All of these may cause metal throwout EXCEPT:
poor fit-up.
tip misalignment.
poor shuntin
...
1. An electrode tip that has mushroomed requires:
more current.
a longer hold time.
a shorter squeeze time.
less force.
2. All of these may cause metal throwout EXCEPT:
poor fit-up.
tip misalignment.
poor shunting effect.
weld-time too long.
3. Technician A says that the E-coat should be left on the exterior flanges
where the spot welds will be made.
Technician B says that weld-through primer may be required on the mating
flange surface where spot welds will be made.
Who is right?
A only
B only
Both A and B
Neither A nor B
4. Technician A says that some liquid-cooled machines circulate coolant all
the way to the tips.
Technician B says that air-cooled machines use two separate sources of
compressed air.
Who is right?
A only
B only
Both A and B
Neither A nor B
5. Technician A says that misaligned electrode tips could cause a resistance
spot weld to be oval shaped.Technician B says that excessive current-on time could cause a resistance
spot weld to be oval shaped.
Who is right?
A only
B only
Both A and B
Neither A nor B
6. A flange is being prepared for spot welding with no adhesive.
Technician A says that E-coat should be removed from the exterior of the flange.
Technician B says that the zinc coating should be removed from the flange
mating surfaces.
Who is right?
A Only
B Only
Both A and B
Neither A nor B
7. Technician A says that spot welding produces less heat-affect than GMA
(MIG) plug welding.
Technician B says that spot welding preserves more of the existing
corrosion protection than GMA (MIG) welding.
Who is right?
A only
B only
Both A and B
Neither A nor B
8. A resistance spot welding machine is making weak welds.
Technician A says that the hold time may be too long.
Technician B says that the facility’s available power may be inadequate.
Who is right?
A only
B only
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