Electric Arc Welding Flashcards
This shade is used for low amperage sheet metal welding
9
This shade is used for low to medium amperage
10
This shade is made for medium amperage
11
This shade is made for medium to high amperage heavy welding and gouging
12
This shade is made for high amperage heavy welding and gouging
14
Do not repair spliced within this much of an electrode holder
3m (10 feet)
Welding machines are classified into these two groups
Constant current (SMAW) Constant Voltage (GMAW)
An electric current that has positive and negative values alternately
Alternating current (AC)
An electric current flow in one direction only
Direct current (DC)
The unit of measurement used in expressing the rate of current flow
Ampere (Amp)
The measurement of electron movement in an electrical circuit
Current flow
The electrical pressure or force that causes current to flow
Voltage (Does not flow in a circuit)
The three types of constant current sources
Transformers
Inverters
Generators
300 Amps at 60% duty cycle means this
300 amps for only 6 minutes of every 10 minutes of operation
Condition from where extensive dc welding has been done at high heats, has a noisy, blowing sound
Arc blow
The 8 sizes of welding cables
Smallest 4, 3, 2, 1, 1/0, 2/0, 3/0, 4/0 Largest
Using a lighter cable 12 to 15 feet attached to the stinger is called this
A whip
Has the electrode connected to the negative terminal
Straight polarity (electrode negative)
Has the electrode connected to the positive terminal
Reverse polarity (electrode positive)
The most common length of electrode
14 inches
SMAW means
Shielded metal arc welding
The general rule for setting amperage on the welding machine
Convert the electrode diameter from a fraction to thousandths of an inch (ex 1/8 = 0.125)
CSA number breakdown
First to digits indicate tensile strength in megapascals divided by 10
The last two digits same as AWS system
AWS number breakdown
First two digits the minimum tensile strength in thousands of pounds per square inch
Third digit indicates welding position
Last digit indicates type of coating and polarity that should be used
The positions an electrode can be used
1 - All positions
2 - Flat and horizontal
3 - Flat only
4 - Flat and down only
Identified by small pit holes and is an indication of gases trapped in the weld
Porosity
Low hydrogen electrodes should be in an over of this temperature
120 C (250F)
Electrodes with cellulose coatings (E6010) should have moisture in the coating of these percentages
between 5-7%
The size of a fillet weld is determined by this
The leg length of the largest triangle that may be drawn within the cross section of the weld
(Strength determined by throat size and largest triangle)
A bead run with no side motion
Stringer bead (two to three times size of electrode)
Bead used as a cover pass for lap and butt welds and building up
Weave bead (Four to six times size of electrode)
4 kinds of weld passes
Root pass, fill pass, cover pass, fill and finish pass
The slope or inclination of the electrode in the direction of travel or against the direction of travel
Electrode inclination
The angle of the electrode in relation to the angle formed by the parts to be joined
Electrode angle
Four types of weld faults
Porosity, slag inclusion, undercut, cracking
Developed to weld carbon and low allow steels using carbon dioxide (Co2) as a shielded gas
MIG welding
Arc welding process that uses a solid continuous wire with a shielding gas
Gas Metal-Arc welding (GMAW)
