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MIG WELDING EXAM WITH ALL QUESTIONS AND VERIFIED ANSWERS
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MIG WELDING EXAM WITH ALL QUESTIONS AND VERIFIED ANSWERS...
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MIG WELDING EXAM WITH ALLQUESTIONS AND VERIFIED
ANSWERS
Metal Inert Gas - ANSWER Is an arc welding process that uses an arc between
a continuous filler metal electrode and the weld pool.
Fusion - ANSWER This is achieved by generating an electric arc between the
consumable filler metal electrode and the workpiece.
What type of power supply unit is needed for fusion? - ANSWER The
required one is that which provides Direct Current Straight Polarity(DCSP) or
Direct Current Reverse Polarity(DCRP).
DCRP Direct Current Reverse Polarity - This is applied to nearly all the
applications of gas metal arc welding, it gives better penetration, and can be
used to well all metals. - ANSWER DCRP Direct Current Reverse Polarity
What is the MIG Welding Process - ANSWER Use a consumable,
continuously fed filler metal electrode.
What is the more common term for the filler metal electrode? - ANSWER
Filler Wire
What conducts the current from the power supply unit to the workpiece or base
metal? - ANSWER Filler Metal Electrode
,What occurs between the electrode and workpiece or base metal? - ANSWER
Electric Arc
This is created by deposition of the filler metal into the base metal. - ANSWER
The bead.
What protects the arc and weld? - ANSWER Gas, or mixture of gasses
What do you want to protect the leads of the welding machine from? -
ANSWER Sparks or Damage.
What are the preferred type of machine recommended for MIG welding? -
ANSWER Rectifier or Motor Generator
MIG welding machines should have what type of voltage characteristics ? -
ANSWER Constant Voltage (Potential)
MIG welding machines supply what type of current? - ANSWER Direct
Current
What are the normal amps limits for MIG welding machines? - ANSWER 200
- 250 amps for all position welding
What must be kept constant to provide a consistent weld? - ANSWER
Welding voltage and arc length.
Which of the following type of machines are NOT Recommended for MIG
welding? - ANSWER Constant Current
, What type of machine would you recommend is best for MIG? - ANSWER
Constant Potential
What are the two basic controls for Constant Potential Welding machines? -
ANSWER Voltage rheostat and wire feed rheostat.
The feeding mechanism usually includes what that energizes the flow of gas? -
ANSWER Welding Power Contactor and a Solenoid
What gun has drive rollers located inside the gun that actually pulls the welding
wire from the wire feeder? - ANSWER Pull Gun
A Pull Gun is used on what size wire and type wire? - ANSWER Small
diameter and soft wire such as aluminum and magnesium.
What type of gun has wire that is pushed to the gun by drive rollers in the wire
feeding mechanism? - ANSWER Push Gun
A Push Gun can handle what size wire and type wire? -
ANSWER Heavier diameter and hard wire such as carbon and stainless steel.
A Push Gun is used to weld with hard wires and where currents often exceed
___________ amps. -
ANSWER 250 amps
Both a Pull Gun and Push Gun are equipped with this items? -
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