Weld 104 Review

Weld defects

100

little air bubbles in the weld

what is porosity

200

excess metal deposited outside the weld

what is spatter

300

caused by high travel speeds and voltage, underfilling the weld

What is undercut

400

short lengths of wire stuck on the plate

what are whiskers

500

caused by trapped hydrogen between slag and weld metal

what is worm tracks

Weld Variables

100

Controls your arc length

what is voltage

200

controls your "amperage"

what is Wire Feed

300

angle of your electrode towards the joint

What is work angle

400

a backhand angle

what is Pull technique

500

Wire speed, Voltage, Travel speed

what is the three primary variables of GMAW

Weld Shielding gas

100

Purpose of gas in GMAW

What is Shielding

200

Argon/co2

What is the most common Shielding gas mix

300

Inert and Active

What are the two shielding gas groups

400

less dense gas added to weld Thicker steels and aluminum. Makes your voice sound funny

what is Helium

500

The temperature at which moisture in gasses condenses as water vapour

what is Dew point

Components in welding system

100

responsible for delivering current to the wire

What is contact tip

200

Takes high tank pressure and lowers it to useable pressure

What is a Regulator

300

helps direct gas and is not required in Self shield FCAW

What is Gas Nozzle

400

Helps keeps the wire from kinking in the cable

What is the Liner

500

makes contact and feeds wire through the line

what are drive rollers

General welding Knowledge

100

The diameter of a single loop of wire

What is Cast

200

Coating that protects completed welds

What is slag

300

Makes spray transfer useable Out of position

What is pulse welding

400

The most commonly used GMAW wire

ER-70s-6

500

What does the "S-6" indicate

What is the amount of Deoxidizers