Smaw Equipment Flashcards
Which term describes the voltage output of the machine while you are welding
Arc voltage
What do you create when current flows through a coil wrapped around an iron core
A magnetic field
Manufacturers design this device in a welding machine to have a certain number of turns of wire
Coil
The main function of which device is to change AC to DC
Rectifier
Which term describes the NEMA rating of a welding machine
Duty cycle
Which term describes the influence that a magnetic field exerts on neighbouring bodies without physical contact
Inductance
Electrode negative is
Straight polarity
Which term describes a noisy uncontrollable arc that flares from side to side
Arc blow
Which term describes a medium that provides an electrical path through which current can flow
Conductor
Which current flows in one direction only and has either a positive or negative value
Direct current
Which of the following is a graphical illustration that plots the relationship between voltage and amperage output of a welding power source
Volt amp curve
Which term expresses the strength of a current of electricity
Amperage
When no current is flowing in circuit but the machine is on you can measure the
Open circuit voltage
The speed at which AC changes direct is the
Frequency
In welding what do you create when enough amperage and voltage exists to overcome the natural resistance to the flow of the electricity
Arc
For what does EMF stand for
Electromotive force
Which term describes a material that can stop current flow through itself
Insulator
Electrode positive means
Reverse polarity
Which term describes the typical sound of an AC transformer type welding machine
Buzz box
This type of welding machine is capable of changing DC to high frequency AC
Inverter
Which is the largest cable size
4/0
Overheating of the cable connections can result from
Poor work lead connection
How do you rate electrode holders
By amperage carrying capacity
Loose work lead connections when using SMAW may cause
Arcing at the work clamp
An advantage to using a magnetic work lead device over a spring loaded clamp is that the magnetic connection
Less likely to damage the work piece
If the welding cable from the machine is size 1/0 then the whip cable should be what size
2
What is the approximate length of a normal arc
Same as the diameter of the core wire
What happens when you increase the arc length
Amperage decreases and voltage increases
What happens when you decrease the arc length
Deeply penetrating narrow bead with more build up
Strength or volume of a current
Referred to as heat
Metal deposition rate
Penetration
Amperage
Pressure or force
Referred to as electro motive force
Or potential
Arc length controls it
Puddle fluidity
Voltage
Short arc
Higher amps
Lower volts
Deep narrow penetration
Normal arc
Same Amps and volts
Depending on electrode diameter size
Long arc
Lower amps
Higher volts
Less penetration wider puddle
How to fix arc blow
Change to AC machine
Change position of ground clamp
Lower heat setting
Weld towards existing tack
Change inclination
Constant current
SMAW and GTAW
Dropping curve
Constant voltage
Wire feed
Relatively flat line
Volts needed to start the arc
50-100 volts
Volts needed to maintain the arc
17-40 volts
Welding wire
#4, 3, 2, 1, 1/0, 2/0, 3/0, 4/0
Most resistant to least resistance
Reverse polarity (DCRP)
Electrode positive
Work piece negative
Electrode melts slower
Welding speed is slower
2/3 heat is found in base metal
Deeper penetration
1/3 heat is electrode giving narrow higher weld profile
Straight polarity (DCSP or DCEN)
Electrode negative
Work positive
Electrode melts faster
Welding is faster
1/3 heat in base metal
Shallow penetration
2/3 heat in electrode
Wider flatter welds
Controls penetration
Amperage
Which type of welding machine is best suited for SMAW welding
Constant current
Stingers are rated by …….
Their current carrying capacity
What regular maintenance should a welder do to a welding machine
Blow out with low pressure high volume air
