Wire Feed Welding Equipment Power Sources

Front 1

Name 2 toxic fumes produced by ultraviolet light.

Back 1

-ozone

-phosegene gas

pg 3

Front 2

What is the primary function the shielding gas?

Back 2

prevents atmospheric contamination

pg 13

Front 3

what is one of the three variable shielding gas can effect?

Back 3

-mode of metal transfer

-arc stability

-penetration

pg 13

Front 4

The powder in a MCAW Wire consists mostly of:

a)Flux

b)Metal

c)Slag Formers

d)Arc Stabilizers

Back 4

b)metal

pg 10

Front 5

Name 3 parts of the the wire feed welder

Back 5

power source

wire feed

electrode holder & cable assembly

spooled filler wire

regulator / Flow meter

shielding gas

a cooling system if required

Front 6

Amperage controls what?

Back 6

-Burn off

-Penetration

pg 16

Front 7

voltage controls what?

Back 7

-Arc stability

-aids in starting the arc

pg 16

Front 8

what does the Regulator do?

Back 8

the regulator brings the gas to a working level

pg 13

Front 9

what does the flow meter do?

Back 9

the flow meter controls how much gas glows to the Gun.

pg 13

Front 10

what governing body sets power source specifications.

Back 10

National Electrical Manufactures Association

(NEMA)

pg 15

Front 11

what are the power sources rated based on?

Back 11

-Amperage

-Voltage &

-duty cycle

pg 15

Front 12

what is the electrode extension range for self-sheilded FCAW?

Back 12

3/4" - 3 3/4"

pg 9

Front 13

Define & Desribe the GMAW process.

Back 13

GMAW - Gas Metal Arc Welding

-Electric arc heats metal from a electrode (continuously fed) to join metals

-Shielding gas prevents contamination from outside air

pg 6

Front 14

List 3 advantages of GMAW.

Back 14

Advantages

-lower skill required

-excellent for light gauge metals

-good arc control for poor fit-ups

-less heat input = less distortion

-high production rates

-high deposition rates

-no slag to remove, little post weld cleanup

pg 19

Front 15

list 3 disadvantages of GMAW

Back 15

Disadvantages

-higher initial cost

-requires more maintenance

-lack of fusion

-cannot be used out doors & drafty locations

-High radiant energy

-wire feeder must be in close proximity

Front 16

one of the main advantages of metal core wire is:

a) lower cost than flux core wires

b) no external shielding gas is required

c) designed for use on conventional CC power sources

d) higher deposition rates

Back 16

d) high deposition rate

pg 21

Front 17

what are the principles of FCAW?

Back 17

-Uses a flux core arc to join metals

-electrode consumable (continuously fed)

-settings maintained by the operator

-shielding gas can be obtained from an external source or/and from within the electrode

Front 18

A welding machine that produces an almost horizontal slope is a:

a) Constant Current

b) Constant Voltage

c) Rising Arc Voltage

d) High Amperage Potential

Back 18

b) Constant Voltage

pg 17

Front 19

what type of amp curve does a constant current machine produce?

a) Flat

b) Variable

c) Rising

d) Drooping

Back 19

d) Drooping

pg 16

Front 20

what is a common power source on GMAW welding machines?

Back 20

Constant Voltage

pg 15

Front 21

constant voltage machines produce a:

a) drooping volt curve

b) rising volt curve

c) relatively flat volt-amp curve

d) constantly changing volt-amp curve

Back 21

c) relatively flat volt-amp curve

pg 21

Front 22

power source best suited for the short - circuit mode of metal transfer is a:

a) rising arc voltage power source

b) constant voltage power source

c) constant current power source

d) constant amperage power source

Back 22

b) constant voltage power source

pg 16

Front 23

How can air quality be affected when welding with shielding gases.

Back 23

-can cause displacement of oxygen

-oxygen deficiency

Front 24

GMAW is also known as?

Back 24

MIG Welding

Front 25

self shielded FCAW use shielding generated from:

a) a base metal

b) an external source

c) the flux

d) a past flux applied to the base metal before welding

Back 25

c) the flux

pg 9

Front 26

GMAW is recomended for use on which of the following metals?

a) stainless steel

b) aluminum

c) copper alloys

d)carbon and low alloys steels

e) all of the above

Back 26

e) all of the above

Front 27

the MCAW process uses the same equipment as?

a) SMAW

b) GTAW

c) FCAW

d) OAW

Back 27

c) FCAW

pg 10

Front 28

How are wire feed guns rated?

Back 28

by current carrying capacity

pg 13

Front 29

welding power designed for wire feed can be used for SMAW?

a) True

b) False

Back 29

b) False

pg 16

Front 30

GMAW may be used in semi-automatic or automatic operation modes?

a) True

b) False

Back 30

a) True

pg15

Front 31

Major factor in choosing air cooled gun / water cooled gun is

a) shielding gas

b) current/voltage

c) joint design

d) base metal alloy

Back 31

b) current/voltage

pg 14

Front 32

a potential source of chemical fumes when welding is:

a) Inert Shielding gases

b) Chlorinated degreasing solvents

c) Carbon dioxide extinguishers

d) Anti-spatter nozzle sprays

Back 32

b) chlorinated degreasing solvents

pg 3

Front 33

The use of shielding gases increases the need for?

a) Lighting

b) Ventilation

c) Heat shielding

d) Eye protection

Back 33

b) Ventilation

pg 3

Front 34

what color should you welding clothing be and why?

Back 34

dark colored

to reduce reflected light

pg 3

Front 35

Name 3 advantages of FCAW.

Back 35

-the deposition rate is greater than SMAW

-there is a high operator factor, easily mechanized

- the visible arc is easy to use

-the weld deposits are high quality

pg 20

Front 36

Name 3 disadvantages of FCAW.

Back 36

-Equipment is more expensive to purchase

-more smoke and fumes are generated

-wire feeder must be in close proximity

-equipment is more complex/ requires more maintenance

pg 20