Electric Arc Welding Flashcards
Is a number 9 welding lens darker or lighter than a number 14
Lighter
What do welding helmets do
Protect your eyes and facial area from light
Heat
spatter
slag
What do welding lenses do
Protect your eyes from:
ultraviolet infrared and visible light
What happens when you get arc flash and what does it feel like
Little water blisters form on your eyeballs
Feels like you have sand in your eyes
Two welding machine classifications
Constant current
constant voltage
What does SMAW stand for
Shielded metal arc welding
What does GMAW stand for
Gas metal arc welding
What are three welding power sources
Transformers
inverters
generators
What is a duty cycle
A rating expressed as a percentage
A welder with a higher duty cycle is better or worse for welding and why
Better because you can weld for a longer time
What is arc blow
It condition encountered where extensive DC welding has been done at high heat’s
How many sizes do welding cables come in
8
What is the smallest and what is the largest welding cable you can get
4=smallest
4/0=largest
What are the two power sources for arc welding
Voltage and amperage
Define voltage
Causes current to flow in a conductor or to cross a gap as occurs in arc welding
Define amperage
Component that causes the electrode the parent metal or both to be melted
What happens when you have a long arc length
Spatter loss is high
penetration is shallow
slag cover can be sloppy or incomplete shielding gases dissipate more quickly
What happens if your arc length is too short
The beat is narrow and built-up penetration is deep
spatter loss is low
Molten slag covers the weld deposit
What is straight polarity
Electrode is connected to the negative terminal
What is reversed polarity
The electrode connected to the positive terminal
Most common
What size is the most common arc welding electrode
14 inches
In a CSA E4918 electrode what does the E stand for
A covered arc welding electrode
In an AWS E7018 electrode what are the first two digits indicating
Minimum tensile strength
In this case 70,000psi
What are four basic welding types
A groove weld
a fillet weld
a plug weld
a surfacing weld
