GMAW Flashcards
What’s GMAW stand for
Gas metal arc welding
What shade of lens should you use when welding
Dark as possible that’s comfortable but no less then the recommended shade
Eyes should be protected from what
Ultraviolet, radiant energy
Face and body should be protected why
Radiation from reflection from surfaces can cause sunburn effects to the skin that’s exposed
Should earplugs be worn
When you’re working at high noise levels
What protective clothing is preferred?
Dark collared denim clothing
Extreme caution should be taken when welding metals that contain zinc why?
Can cause toxicity
What are three metal transfer methods?
Short circuit
Globular transfer
Spray arc
Sheet metal uses which method of welding
Short circuit
When wire speed is increased what also needs to be increased
Heat
What will happen if voltage is too high and wire is too low
will burn back
sputtering weld
Once machine is set to recommend a charts, what must be done to ensure set up
Test piece
What’s the benefits of flux cord welding?
All positions are capable
Quality
Minimum skill
Each type of shilling and gas can affect the world characteristics in what way
The depth of fusion
Welding bead
Welding speed
What is the primary purpose of shielding gas?
Prevent mould metals from absorbing elements, such as oxygen and nitrogen from atmospheric air
List some considerations when selecting shielding gas
Base metal
Filler metal
Welding process
Width and depth
Joint design
Can argon gas cause suffocation
Yes
Carbon dioxide can act as a asphyxia
True
CO2 is the cheapest gas available
True
When oxygen is added to shielding gas, it could help with puddle fluidity
Yes
Argon has a high or low thermal conductivity
Lower
Helium has a higher or lower thermal conductivity
Higher
Hydrogen is the smallest known element and highly combustible, true or false
True
Nitrogen is considered an insert gas, true or false
True
Nitrogen is fumble
False because it’s insert gas
What is the current priority for gas metal or welding of stainless steel?
DCEP
What is the correct traverse and longitude angle?
10-15 degrees
Stainless steel has high or low thermal conductivity
Low
What is the ore of aluminum?
Bauxite
Aluminum has a high or low thermal conductivity
High
What’s the melting point of aluminum?
660
1220 Fahrenheit
Does aluminum develop an oxide?
Aluminum has a natural factory oxide
Aluminum coefficient of expansion is how much greater than steel
Twice the amount
GMAW enables aluminum welding to be at high speeds
Yes
What gas is normally used to weld aluminum
Pure argon
What current and polarity is used for aluminum
DCEP
Name the types of wire feeders used for welding aluminum
Push and pull motor
Dirty material will cause what problem
Inadequate gas coverage
Dirty filler wire
Cracking
Lack of shielding gas will cause what problem
Porosity
Spatter
Oxidation
Fusion
How far should the stick out be
1/8 to 1/4
What are the correct gas flows
Flux core 15-25 cfh
TIG 10-20 cfh
How is electrode sized
Based material
welding amps
What gas is used for stainless steel and aluminum
Stainless steel -helium /argon
Aluminum- argon
Travel direction of stainless steel and aluminum
Stainless steel - pull
Aluminum- push
Gas pressure for stainless steel and aluminum
Stainless steel - 15-20 cfh
Aluminum- 35 cfh
