Show:
Safety
Vocabulary
Equipment
Misc
Facts about MIG
100
When Mig welding what types of shoes should you wear?

Why should you wear them?

Full leather toes shoes.

Because slag and burning metal fall and can get inside of an open toe or lace up shoe and catch on fire if its not leather

100
GMAW stand for
Gas Metal Arc Welding
100
Is MIG typically electrode Positive or negative?
Positive
100
Do you push or pull Mig welds? And why?
You can push or pull a Mig weld. It is dependents on how deep you need to penetrate. Pull to penetrate deeper, push to penetrate shallower
100
List three reasons that a company would choose MIG over any other welding process.
Cost less

Less training

More cost efficient

Less waste

200
When over head MIG welding what is one safety precaustion that you should take to prevent slag from bouncing into you ear?
Ear plugs
200
The distance from the contact tip to the end of the welding wire
Electrode Extension
200
Name at least three pieces of the MIG welding assembly
Welding power source,

Welding gun,

Electrode wire,

Wire Feeder,

Shielding gas,

Workpiece lead

200
What is the typical setting for a gas flow rate?
30-35
200

THE AIR IN THE WELD AREAS IS DISPLACED BY THE SHIELDING GAS TO PREVENT IT FROM CONTACTING THE WELD POOL. This is what??


Shielding gas
300
Whats the lowest shade your lens should be on when MIG welding?
10
300
What are the three modes of transfer that can occur with Mig welding?
Globular, Spray, Short Circuit
300
Is the current AC, or DC
Direct current
300
A highly reactive gas that readily combines with other elements in molten metal to form oxides and gases.
Oxygen
300
The most commonly used inert gas
Argon
400
What is the proper way to turn on your gas for MIG welding?
Start by slowly opening the tank, then turn until all the way open.
400
Metal transfer mode that molten metal from a consumable welding wire is deposited during repeated small bursts. This can occur up to 200 times a second
Short circuit transfer
400
What is the three main end pieces that make up the MIG gun that you come in contact with most likely.
Gas Nozzle, Contact Tip, Gas Diffuser
400

IT’S A VERY HIGH COST, SO IT IS USED PRIMARILY FOR SPECIAL WELDING TASKS AND FOR NONFERROUS METALS SUCH AS ALUMINUM, MAGNESIUM, AND COPPER. LIGHTER THAN AIR AND REQUIRES HIGH FLOW RATES


Helium
400
What is pulsed spray transfer

IS A VARIATION OF SPRAY TRANSFER IN WHICH CURRENT IS PULSED FROM A LOW BACK GROUND LEVEL TO A PEAK LEVEL ABOVE THE SPRAY TRANSFER TRANSITION CURRENT.

REQUIRES AN INVERTER WELDING MACHINE EQUIPPED WITH A PULSING UNIT

500
What type of gas do we use in the shop?
75/25

Argon/CO2

500
A weld defect that can be caused by poor gas coverage, poor tip to surface distance and occurs all throughout the weld
Porosity
500
What are the elements in the air that can cause difficulties when welding?
Oxygen, Nitrogen, and Hydrogen
500
Name the 6 types of weld defects that can occur
Incomplete fusion (overlap)

Porosity, Crater Cracks, Insufficient Penetration,

excessive penetration, whiskers

500
What advantages does the copper coated wire give to the electrode wire?

THE COPPER COATING ON GMAW ELECTRODE WIRE HELPS IN ARC STARTING, IMPROVES WIRE FEEDING, AND PROLONGS CONTACT TIP LIFE.