welding final

when prepping a 1/8 in tungsten electrode, the tip length should be around

1/4 in

running a bead keeping a gap of about 1/16 to 1/8 in hold the GTAW torch at a ___ angle

10-15 degree push

when welding on 1/8th in steel, you should set your amperage to ____ amps

125

cylinders are extremely under pressure at appx. ___ psi

2500

recommended flow rate for helium gas when GTA welding is

30-50 CFH

using balanced AC polarity ___% of the heat generated from the arc is directed into the base metal and ___% is directed to the arc

50/50

An E71T-X FCAW electrode will have a minimum of ___ psi tensile strength.

70,000

the most common type of mixed shielding gases used wit FCAW-G in North America is

75% Argon and 25% CO2

For Gas Shielded Arc Welding the AWS Specification for Carbon Steel Filler Metals is ___.

A5.00

The four major welding variables with both FCAW-S and FCAW-G are arc voltage, wire feed speed, travel speed, and ____.

CTWD

in GTAW ___ polarity results in better penetration and the heat is concentrated in the work piece

DCEN

Gas-shielded electrodes use ____ polarity to ensure proper fusion.

DCEP

welding with GMAW utilizes the polarity

DCEP

the classification system of the electrode that contains the highest levels of silicon is

ER70S-6

FCAW-S electrodes do not require

additional shielding gas

which term most closely matches the term polarity switch

adjusts polarity from AC to DC

which term most closely matches the term pulse TIG control

adjusts the pulse frequency

larger diameter electrodes usually

all of the above

proper FCAW gun selection depends on

all of the above

welding power supplies have ___ that needs to be blown out periodically

all of the above

to provide a proper seal, double-seat seal cylinder valves must be opened

all the way

electrode diameter will limit

amperage

electrode holders are rated by the ___ of the electrodes they hold

amperage

the arc voltage for GTAW increases with

arc length

when welding make sure the work cable is connected __ to the part being welded

as close

weld shielding provides protection of the arc stream and prevents

atmospheric contamination

___ mode of metal transfer creates an excellent finish weld bead appearance and has the highest operator appeal

axial spray

when welding with DCEN, the heat is concentrated in the work resulting in ___

better penetration

two pieces of material that are aligned edge to edge in the same plane is a ___ joint

butt

a deep and broad penetration profile characterizes the use of ___ as a shielding gas in the GMAW process

carbon dioxide

which term most closely matches the term mode switch

changes welding modes from stick mode to TIG mode

a common problem with GMAW-S is ___

cold lap

a weld face that has a curving inward shape has

concavity

which term most closely matches the term electrode/gas output receptacle

connects the power source to the electrode lead and gas hose

which term most closely matches the term work stud

connects the power source to the work cable

body weight distribution and a good stance during a weld results in

consistent welds

for FCAW power sources, the output characteristics fall into two main categories: Constant current and

constant voltage

a weld face that is high and rounded in shape has

convexity

If the arc voltage, WFS and CTWD are held constant, too fast travel speed increases

convexity of the bead

amperage is kept constant with a constant ___ power source

current

Carbon dioxide produces a penetration profile that is ___ and ___ than that of an argon blended shielding gas

deeper, broader

a weld flaw significant enough to render the weld rejectable is a

defect

GTAW electrode stickout should be 2-3 times the ___ of the electrode

diameter

which term most closely matches the term digital meter

displays the current output level

the percentage of time in a ten minute period that a power source can be operated continuously at the rated amperage before over heating is

duty cycle

when trouble shooting a GMAW system categorize the problem into one of three groups: wire delivery, gas delivery, or

electrical

in order to minimize exposure to ___ never coil the electrode lead around your body

electromagnetic fields

welding too ___ a travel speed produces a ___ bead sitting on top of the base metal

fast, narrow

___ electrodes are well suited for high-speed welding on horizontal surfaces

fast-fill

a ___ electrode has a moderate type of penetration

fill-freeze

to control amperage during GTAW process the operator uses a

foot pedal

___ mode of metal transfer typically begins at 125 amps and uses a continuously fed solid-or metal-cored wire electrode depositing in a combination of short circuits and gravity assisted large drops.

globular transfer

argon and __ are classified as inert shielding gases

helium

if the arc voltage, wire feed speed, and travel speed are held constant, decreasing the CTWD will

increase current

___ electrode extension increases the resistance to the flow of current in the electrode and the current in the arc is ___

increasing, decreased

which term most closely matches the term thermal shutdown light

indicates internal overheating with yellow light

___ have the advantage of being able to vary the frequency of the AC welding output

inverter

when purchasing cables, select the appropriate cable based on both ___ and amperage

length

load range and ___ are the two basic components of fatigue on a weld

load cycle

welding power sources use a step down transformer that takes high voltage, low amperage AC input and changes it to ___ AC welding current

low-voltage, high amperage

higher silicon and ___ deoxidizer level enhances toe wetting and finished weld bead appearance

manganese

an advantage to the FCAW-G electrode is

minimal spatter

to provide corrosion resistance on weathered steel when welding requires the electrode to contain 1%

nickel

one of the limitations of SMAW welding is

operating factor

the three elements that need to be present for a fire are ___, heat, and fuel

oxygen

which term most closely matches the term AC balance control

permits AC TIG wave balance control adjustment from maximum penetration to maximum cleaning

AWS restricts the level of sulfur and ___ in GMAW electrodes due to undesirable welds and cracking

phosphorus

an advantage to using FCAW-S vs FCAW-G is

portability

if the tungsten electrode is purple or dark blue it is a sign of inadequate

post flow

___ and ___ are alloying elements added to the FCAW electrodes to stabilize the arc

potassium, sodium

which term most closely matches the term maximum output control

presets the maximum output current level with the remote amptrol

which term most closely matches the term remote receptacle

provides connection for remote control or arc start switch

the welders ability to weld a long distance and maintain comfort refers to

range of motion

a defect is a weld flaw large enough to render the weld

rejectable

if the protective insulation of the cable is damaged, and the cable is exposed, it needs to be

replaced

cylinders must be ___ and in the upright position when storing and using

secured

which term most closely matches the term post flow timer

sets the shielding gas flow time after the arc is shut off

the welding current determines the ___ number lens required

shade

porosity is a hole in the weld from lack of

shielding

A gas-shielded gun assembly has multiple O-rings, if these O-rings become damaged or missing it will cause loss of ____.

shielding gas

___ mode of metal transfer is capable of root pass work on pipe and has all weld position capability

short circuit

___ was the earliest metal transfer mode for the GMAW process

spray transfer

these beads can be used in flat, vertical, and overhead positions

stringer

using the ___ method to initiate the welding arc minimizes arc strikes on the metal surface

tapping

this test is an actual measure of the amount of force required to pull a weld sample apart

tensile

ability of a metal to resist forces attempting to pull it apart or stretch it is called

tensile strength

the main difference between an E81T-X electrode and an E71T-X electrode is

tensile strength

edges of welds are called

toes

the ___ inside a welding power source converts high voltage, low amperage electricity into low voltage, high amperage electricity for welding

transformer

welding operation inspection includes which of the following

travel speed

when term closes matches the term "power switch"

turns machine on

weld defect in which the base metal at the toe of the weld on one or both sides is eroded by the heat of the arc

undercut

the lack of sufficient weld material to complete the weld as desired or expected is called

underfill

when a bead is produced with the amperage too low, __ can occur

underfill

a discontinuity is the interruption of the ___ of a weld

uniformity

the first step in cleaning the power source is to

unplug or lockout/tagout machine

the last digit of the FCAW electrode classification system indicates the

usability characteristics

which of the following is a non-destructive method of evaluating a weld

visual inspection

the ___ technique is used with the fast-freeze electrode type

whipping

in the FCAW process as voltage increases, arc length gets longer resulting in the arc cone being

wider