Electric Arc Welding Flashcards Preview

Millwright 2nd Year > Electric Arc Welding > Flashcards

Flashcards in Electric Arc Welding Deck (25):
0

What do welding helmets do

Protect your eyes and facial area from light
Heat
spatter
slag

1

Is a number 9 welding lens darker or lighter than a number 14

Lighter

2

What do welding lenses do

Protect your eyes from:
ultraviolet infrared and visible light

3

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

4

Two welding machine classifications

Constant current
constant voltage

5

What does SMAW stand for

Shielded metal arc welding

6

What does GMAW stand for

Gas metal arc welding

7

What are three welding power sources

Transformers
inverters
generators

8

What is a duty cycle

A rating expressed as a percentage

9

A welder with a higher duty cycle is better or worse for welding and why

Better because you can weld for a longer time

10

What is arc blow

It condition encountered where extensive DC welding has been done at high heat's

11

How many sizes do welding cables come in

8

12

What is the smallest and what is the largest welding cable you can get

4=smallest
4/0=largest

13

What are the two power sources for arc welding

Voltage and amperage

14

Define voltage

Causes current to flow in a conductor or to cross a gap as occurs in arc welding

15

Define amperage

Component that causes the electrode the parent metal or both to be melted

16

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

17

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

18

What is straight polarity

Electrode is connected to the negative terminal

19

What is reversed polarity

The electrode connected to the positive terminal
*Most common*

20

What size is the most common arc welding electrode

14 inches

21

In a CSA E4918 electrode what does the E stand for

A covered arc welding electrode

22

In an AWS E7018 electrode what are the first two digits indicating

Minimum tensile strength
In this case 70,000psi

23

What are four basic welding types

A groove weld
a fillet weld
a plug weld
a surfacing weld

24

What are some advantages of gas metal arc welding

Skill requirements are lower
low current arcs are possible
good arc control makes the manual welding of joints with poor fit up possible