welding exam

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The preventive maintenance schedule for an engine driven welding machine is usually based on

the number of hours that the engine operates

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A voltage step down transformer converts

high voltage ,low amperage current to low voltage, high amperage current

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the conductors in welding cables are made of strands of what wire

copper

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engine generators should be shut down if no welding is to take place for more than how many minutes

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if the tip of a smaw electrode is touched and help against the workpiece instead of allowing for a gap between the two the electrode will

pass electricity directly to the workpiece without creating an arc

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hand tools for preparing a welding surface and cleaning a completed weld include

files, wire brush and chipping hammers

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weld slag chippers and needle scalers are what tools

pneumatically powered

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smaw power supplies are designed to produce an output that has a what current

nearly constant

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the longer the distance the welding current must travel the

larger the welding cable must be to reduce voltage drop

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in a transformer rectifier type welding system AC voltage is reduced to a lower voltage level and then converted (rectified) into

DC voltage

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when lifting heavy objects objects that tend to spin or swing always remember to use

tag lines

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the primary current for a welding machine can be 120v or 240v single phase or _________ three phase

480v

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the size of an arc welding machine is determined by its rated amperage and

duty cycle

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when stringing welding cable overhead or between floors use ____ to tie off the cables

rope

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the standard frequency of alternating current (AC) in the US is set at _________ cycles per second

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the flux coating of electrodes _________ the metal

cleans and deoxidizes the metal

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non low hydrogen electrodes may be used if their coatings are not damaged and they have not come in direct contact with ______

water or oil

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the chemical and mechanical properties of the base metal can be obtained bt referring the the ______

base metal mill specifications

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All electrodes used for code work must have the AWS classification number printed on them as well as on the

container in which they are shipped

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normally an electrode should be ______ than the metal being welded

smaller in diameter

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The . powdered metal added to some flux coatings adds filler metal to a weld and helps ________the weld

improve the appearance of

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if quality control representatives find that welds made on critical equipment were made with high moisture electrodes the welds made will have to be

replaced

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the weld in smaw is formed by the

wire core mixing with the melted base metal

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Electrodes with powdered iron in their flux belong to the ______ electrode group

fast fill

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The most common electrodes are discussed in the American welding society specifications

A5.1 and A5.5

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Acceptable base metal and filler metal combinations are listed in section II, material specifications of the

American society of Mechanical Engineers (ASME) Boiler and pressure vessel code

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Low hydrogen electrodes that exceed the maximum exposure time can be

dried one time

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The period of time a low hydrogen electrode can be outside a heated oven is

defined by exposure time

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To determine the minimum tensile strength per square inch of the deposited weld metal created by an electrode multiply the first 2 digits ( or 3 if 100 or over ) of the marking on the electrode by _______

1000

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After sealed container of low hydrogen electrodes is opened the electrodes must be stored in special ovens at a temperature setting of

250

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welding codes require that the crater made by a termination of the weld be filled to the full __________ of the weld

Cross Section

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Arc strikes are left on the base metal by the ________ method of striking an arc

scratching

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a weld bead that is made with a side to side motion of the electrode is called a __________ bead.

weave

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The best method of striking an arc when using a transformer DC welding machine is the _______ method

Tapping

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Magnetic fields created during welding tend to concentrate in the corners of the ________.

base metal

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When striking an arc in SMAW welding the general rule is that the arc length should be _________

the same as the diameter of the electrode

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concentrated magnetic fields in the base metal cause the arc to .

Deflect

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the most common fillet welds made are in ___________ joints

lap andT joints

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When practicing welding, reuse weld coupons until

all surfaces have been welded on

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to control the weld puddle when depositing an E6010 electrode stringer bead use a _________ motion

whipping

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welding codes require that the crater made by a termination of the weld be filled to the full __________ of the weld

Cross Section

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Arc strikes are left on the base metal by the ________ method of striking an arc

scratching

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a weld bead that is made with a side to side motion of the electrode is called a __________ bead.

weave

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The best method of striking an arc when using a transformer DC welding machine is the _______ method

Tapping

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Magnetic fields created during welding tend to concentrate in the corners of the ________.

base metal

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When striking an arc in SMAW welding the general rule is that the arc length should be _________

the same as the diameter of the electrode

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concentrated magnetic fields in the base metal cause the arc to .

Deflect

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the most common fillet welds made are in ___________ joints

lap andT joints

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When practicing welding, reuse weld coupons until

all surfaces have been welded on

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to control the weld puddle when depositing an E6010 electrode stringer bead use a _________ motion

whipping

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A fillet weld is acceptable even if it has _______

a slight non-uniform face

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before welding coupons made of 1/4" to 3/4" mild steel use a wire brush or grinder to ______ the coupons

remove heavy mill scale or corrosion

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the point at which the back of the weld intersects the base metal is called the weld _____

root

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when overlapping stringer beads use a work angle of ________ degrees toward the first stringer bead to obtain proper tie - in

10 to 15

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arc length is measured from______

the end of the electrode core to the base metal.

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When using stringer beads on V groove welds in the horizontal position keep the electrode drag angle at _______ degrees

10 to 15

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the distance the joint preparation extends into the base metal is called the

depth of bevel

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prior to welding any surface in a weld groove is called a

groove face

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the most common American welding society plate welding qualifications test requires the use of _______ electrodes

low hydrogen

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when preparing weld coupons for V groove welds with backing center the beveled strips on the backing strip with a ________ gap and tack - weld them in place

1/4"

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prior to welding any surface in a weld groove is called a

groove face

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cooling welds with water can cause weld cracks and affect the mechanical properties of the _______

base metal

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single groove welds with metal backing are used for ______ welds.

high- strength

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When practicing horizontal v-groove welds, pay particular attention at the termination of the weld to fill the

crater

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When running vertical stringer beads on a v- groove joint in the vertical position, set the welder amperage in the ____________ of the range for better puddle control

lower part

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When preparing weld coupons for v- groove welds with backing, cut the metal backing strips so that they are at least

1" by 8"

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The most common American Welding Society plate welding qualification test requires the use of

low hydrogen electrodes

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Groove welds should be made with slight reinforcement and a gradual transition to the base metal at each

toe

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The centering head attachment of a combination square is used to measure

round stock and to locate the center of shafts or other round objects

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Chain clamps are used to align and hold pipe for

fit up and tacking

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A simple welding sequence with short welds ___________ of the joint is recommended to reduce the effects of shrinkage

on alternating sides

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Internal misalignment between two sections of pipe to be welded end to end is checked using a

Hi-Lo gauge

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When using weave beads in flat open root v groove welds use a ___________ degree drag angle

10-15

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Welding codes allow the __________________ on an open -root v groove welds to be within the range of 0" to 1/8"

root face

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When running vertical weave beads on a v groove joint in the vertical position the width of the weave beads should be no more than ________ times the diameter of the electrode being used

five

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if 3/8" carbon steel is not available, practice welds can be made on steel ____ to 3/4" thick

1/4"

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cooling with water is only done on

practice coupons

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when using weave beads on an open root v groove welds in the vertical position , keep the electrode at a work angle of ____________ degrees to the plate surface for the first pass

0 degrees

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for an open root v groove weld, root reinforcement should be flush to

1/8''

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To prevent undercut in a vertical open root v groove weld , the welder

should pause slightly at each weld toe to penetrate and fill the crater

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to control the weld puddle when welding horizontal open root v groove welds drop the angle of the electrode slightly, but no more than

10 degrees

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Horizontal welds can be made on a horizontal open root v groove or on a

vertically positioned flat surface

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groove welds should be made with slight reinforcement and a gradual transition to the base metal at each

toe

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when the plates are vertical and the axis of the weld is horizontal, the code for this position of groove weld is

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Created by: grace17grace