P4

Question 0

What’s produced when welding power source is but NO arc exists

Answer 0

Open circuit voltage

Question 1

The heat an arc creates ranges between

Answer 1

5500-6600

Question 2

The mixtures of melted electrodes and melted base metal created by the welding current flowing through the electrode and across the arc is called?

Answer 2

The weld deposit

Question 3

In shielded metal arc welding, metals are fused by the heat from an electric arc that is maintained between the surface of the workpiece and a ?

Answer 3

Coated electrode

Question 4

In SMAW, what does electric coating do?

Answer 4

Protects the molten from the atmosphere

Question 5

The “shielding” in the SMAW process is provided by

Answer 5

The electrode coating

Question 6

What is the force called that causes current to flow in an electrical circuit

Answer 6

Voltage

Question 7

The electrical pressure or voltage in a welding circuit after the arc has been struck is called?

Answer 7

Arc voltage

Question 8

Electrical pressure is measured in?

Answer 8

Volts (V)

Question 9

Electrical current flow is measured in

Answer 9

Amperes (A)

Question 10

The electrical circuit in the SMAW process is closed at the point when

Answer 10

The arc is struck

Question 11

Undercut is usually caused by improper electrode manipulation. Other causes are

Answer 11

To much current, To much Arc , To fast of travel

Question 12

What is the purpose of “Fast Fill”

Answer 12

Used for production work, adds lots of filler metal at fast rate

Question 13

What’s the purpose of “Fast Freeze”

Answer 13

Deposits weld bead that can solidify or freeze quickly, good for welding overhead or virtacle

Question 14

What is the purpose of “Fill freeze” (fast follow)

Answer 14

Fill freeze allows for faster speed with consistent bead, main use is to use little fill on light gauge metal

Question 15

What is “Low hydrogen” Basic

Answer 15

Hydrogen can be harmful to metal properties
And become trapped in deposits causing it to crack, (hours after finished)
Internal stress causes under bead cracking
To protect it, it is used with no organic substances containing hydrogen

Question 16

Electrode dimensions (diameter) range from mm/”

Answer 16

1.6 mm 1/16 - 8mm 5/16

Question 17

Electrode lengths range from and most commen length is

Answer 17

225mm 9” to 1000mm 36”

Most common 350mm 14”

Question 18

BASIC FUNCTION of welding electrode in an arc welding circuit is to

Answer 18

Carry the current that generates the arc

Must also melt and fuse metal to create proper weld

Question 19

Bare-wire electrodes were designed to

Answer 19

Eliminate need for separate filler material

Question 20

Flux coating has 6 functions it performs

Answer 20

• forms gas shield to keep gas and oxy from pool
• controls electric arc stream
• adds alloying elements + filler to weld metal
• cleans weld pool by floating impurities and oxygen
• forms cover that shapes cooling metal from oxidization
• forms cover of slag to reduce cooling rate

Question 21

Cellulose does what

Answer 21

Forms cup type shield at electrode tip. It gives direction to shielding gases and arc stream forms gas envelope of carbon dioxide and water vapour

Question 22

What’s Rutile

Answer 22

“Titanium dioxide” makes the arc smooth and stable, and forms a hard black slag to make for a smooth finish

Question 23

China clay, silica, mica

Answer 23

Used for electrode coating to provide volume, controls viscosity and surface tension of slag and freeze rate of slag

Question 24

Potassium

Answer 24

Used as arc stabilizer and ionizer to help ease and stabilize current flow

Question 25

Ferro-manganese

Answer 25

Removes oxygen from arc ferro-manganese then forms with oxygen to form an oxide to make slag

Question 26

Sodium silicate (water glass)

Answer 26

Heavy liquid sticky to bind materials and coat core wire