Chapter 16 - GMAW and FCAW Flashcards
A ball-float flowmeter must be installed in a ______ position?
Vertical
If the drive rolls in the wire feeder put too much pressure on a flux core wire, what happens?
The drive roll will slip over the wire
What is the name of the pliers used to cut electrode wire?
welpers
What happens when the purge switch is pressed?
Shielding gas starts to flow. The switch is used to set the flow rate and to purge any air in the hose.
List a cause of birds nest
Wire feed speed is too fast
Welding gun is held too close to the work
Voltage is set too low
A type of wire feeder roll with ridges in the groove to grip and push the electrode wire
Knurled roll
A control on a welding machine that allows variation in the length of time that post flow continues
Post flow adjustment
A receptacle on the welding machine where the wire feed control mechanism is plugged in.
Remote contractor control
Constant Voltage or Constant Current
Constant Voltage
In MIG do we push or pull the puddle?
Push
List the 3 types of metal transfer
- Short Circuit
- Globular
- Spray Transfer
List a disadvantage of MIG
Doesn't work well in wind Expensive equipment Joints can be tricky Not as mobile Requires additional shielding gas
Flux core uses what type of drive roll?
Knurled drive roll
MIG uses what type of drive roll?
V groove
Metal Core uses what type of drive roll?
Knurled drive roll
Aluminum uses what kind of drive roll?
U shaped
What is the purpose of using carbon dioxide as a shielding gas?
Gives it the penetration
Because the contact tube is not visible, which distance do you control while welding?
Nozzle to work distance
When making a fillet weld, what is the proper work angle?
0 degrees
Which method produces the best penetration?
Backhand
Which method produces less spatter?
Backhand
How long should the electrode extension be when using GMAW in short circuit?
1/4” to 1/2”
What determines the welding arc length in GMAW?
The voltage set on the welding machine
What do you do if your weld pool gets too large?
Increase travel speed
What type of metal transfer can be used out of position?
Short circuit and pulse spray transfer
When welding overhead, the shielding gas flow rate must be increased
True
The welding gun is usually pointed up when welding vertically up?
True
Which position is considered the most difficult?
Overhead
A lap joint often requires that the electrode is pointed more toward the ____________ than the edge.
surface
