101 moved Flashcards
What is C2H2
Acetylene
What is C2H2’s critical pressure
a) 20psi
b) 28psi
c) 30psi
d) 38psi
b) 28psi
Max safe working pressure (MSWP) of C2H2?
a) 5psi
b) 10psi
c) 15psi
d) 20psi
c) 15psi
C2H2 should not be drawn off more than _____ of its capacity per hour or emptied in less than ____ hours.
a) 1/5 , 5
b) 1/6, 6
c) 1/7, 7
d) 1/8, 8
c) 1/7, 7
O2 hoses are _______ and have ______ hand threads.
a) red, right hand
b) green, right hand
c) red, left hand
d) green, left hand
b) green, right hand
C2H2 hoses are ______ and have ______ threads.
a) red, right hand
b) green, right hand
c) red, left hand
d) green, left hand
c) red, left hand
What regulator malfunction occurs when the valve on the high pressure side does not seat properly & gas leaks past the seat; raising the pressure above normal.
a) backfire
b) burn back
c) flash back
d) creep
d) creep
This can blow off the relief valve or rupture the bourdon tube in low pressure gauge.
What metal should never be used on oxy-accetylene fittings?
a) titanium
b) copper
c) red bras
d) both b& c
d) both b& c
Red Brass & Copper should never be used on an oxy-acetylene set up
There are two different typed of welding tips.
Match the names with the descriptions
Swedge & straight,
The _____ tip produces a thin pointed type flame.
The _____ bore type produces a bulbous type flame.
The swedge tip produces a thin pointed type flame.
The straight bore type produces a bulbous type flame
Name the 3 types of flames
Neutral
Carbonizing (reducing, carburizing)
Oxidizing
What is a backfire?
A backfire is when the flame backs up into the tip and re-establishes itself with a loud bang or popping sound.
Name 3 causes of backfire
- too little of gas speed
- obstruction of gas flow
- loose or faulty seat connection
- dirty tip
- a hot tip
What is this a description of?
The speed at which a flame will travel in a pre-mixed gas
flame of propagation
How fast will C2H2 burn with O2?
a) 10-17 feet per second
b) 17 - 25 feet per second
c) 15 - 25 feet per second
d) 25 - 29 feet per second
b) 17 - 25 feet per second
When referring to the molten metal left on the bottom of a plasma cut what is the name of the left over molten metal?
Dross
When referring to the molten metal left on the bottom of an oxyacetylene cut what is the name of the left over molten metal?
Slag
What is another name for a standard torch?
heavy duty torch
What are the 3 torch type systems?
heavy duty/standard
machine
combination
What are the 3 machine control systems
manual and machine tracer
magnetic tracer
electric tracer - CNC
What are the 3 cutting methods when using a cutting torch?
across, push, pull
What are the 3 methods of prepping material for a cut?
Chiseled (nick)
Drill
Bead of arc weld
what are the 2 methods of starting a cut with an oxy-acetylene torch?
Still torch & traveling torch methods
What general metals can a plasma arc cut?
All metals that conduct electricity
Explain plasma
A gas which has been heated to an extremely high temperature by an electric arc.
This causes the gas to ionize, making it electrically conductive.
Plasma is considered to be the fourth state of matter; the others are gas, liquid and solid.
On a PAC torch system does the plasma and shielding gasses;
a) travel through the same pathway
b) travel through separate pathways?
b) the plasma and shielding gasses travel through separate passageways ( dual flow torch)
PAC is an arc cutting process that uses a ______ ___ to remove molten metal with high velocity jet of ionized gas flow through a constricting nozzle
constricted arc
AC is ____ current of thousand of cycles per second.
a) high wavelength
b) high frequency
c) low wavelength
d) low frequency
b) high frequency
PAC operates on _____
a) DC, DCRP
b) DC, DCSP
c) CC, DCRP
d) CC, DCRP
b) DC, DCSP
PAC power source uses _____ with a range of _______ psi.
a) open circuit, 120 - 400.
b) closed circuit, 120 - 400
c) open circuit, 100 - 400
d) closed circuit 100 - 400
a) open circuit, 120 - 400.
If using a nozzle for plasma arc gouging what is the nozzle doing to the arc?
reduces arc constriction, resulting in lower arc stream velocity.
_______ are common in many fabrication shops because of the availability and economy of compressed air. These torches provide quality cuts of carbon steels.
a) air torches
b) gas torches
c) compressed air torches
d) compressed gas torches
c) compressed air torches
PAC produces a ______ heat affected zone (HAZ) along the kerf
a) very wide
b) very narrow
c) slightly wide
d) slightly narrow
b) very narrow
What is the max stickout for CAC-A?
a) 5”
b) 6”
c) 7”
d) 8”
c) 7”
What is the min stickout for CAC-A?
a) 2”
b) 4”
c) 6”
d) 8”
a) 2” so you dont melt the plastic housing on the torch
List the 3 expansion types
solid, transitional (grains change)
fluid (molten)
What upset is the following situation describing?
When a broken bolt is heated up so it contracts and expands when cooled
Dimensional upset
With the 3 types of distortion which one would you generally use a wedge to help combat it.
a) angular
b) transverse
c) longitudinal
d) cross
b) transverse
_______ has adopted the AWS symbols and added some modifications and symbols of their own
CSA
What are the 4 weld types that can be depicted by a weld symbol.
a) plug/slot, surfacing, groove, fillet
b) slot, plug, groove, fillet
c) plug, slot, groove, fillet
d) corner, plug/slot, groove, fillet
a) plug/slot, surfacing, groove, fillet
A welding symbol as a _______ line, an _____ line and at least 1 weld symbol.
a) reference, direction
b) reference, arrow
c) procedure, direction
d) indication, arrow
b) reference, arrow
A broken arrow is used with J and ___ to indicate which side is prepped.
a) fillet
b) bevel
c) groove
d) surface
b) bevel
A _______ welding symbol doesn’t indicate the welding of a joint and has arrow side significance only.
a) fillet
b) bevel
c) groove
d) surface
d) surface
The vertical leg of a fillet, bevel, J is always on the left leg ________.
a) horizontal
b) vertical
c) perpendicular
d) parallel
c) perpendicular
Dotted U groove weld symbol is a ______ standard only. Indicates preparation of the groove by the
a) CSA
b) AWS
C) ANSI
d) WHMIS
a) CSA
Dotted U groove weld symbos is a __ standard only.
Indicates preparation of the groove by the CAC-A process
a) CSA & AWS
b) AWS
c) CSA
d) ANSI
c) CSA
Dotted U groove symbol is a CSA standard only
The _____ is used for specification data, cutting & welding processes, other info that cant be placed in symbol form & also for info pertaining to the weld that is located elsewhere on the drawing (saves repeating of info in the welding symbol)
a) top
b) tail
c) flip
d) fly
b) tail
The purpose of ______ - metals low in ductility or prone to cracking should be preheated
a) post heat
b) preheat
c) annealing
d) induction
b) preheat
CC - needs volt sensing
The purpose of ______ prevent hydrogen induced cracking, martensite forming.
a) post heat
b) preheat
c) annealing
d) induction
a) post heat
The following describes Upper or Lower temps
- normalizing (still air), annealing(long time), hardening (flame and induction)
Upper
At heights guard rails are to be between
a) 30” - 40”
b) 30” 45”
c) 36” - 40”
d) 36” - 42”
d) 36” - 42”
What is the ratio when using a ladder for how far out from the wall the ladder must be?
1:4 (4 up & 1 out)
A tool rest on a bench grinder should never be more than ______ away from the stone.
a) 1/6”
b) 1/8”
c) 1/4”
d) 5/16”
b) 1/8”
_______ can cause burns to the skin and retinas
a) ultraviolet
b) infrared
c) invisible x-rays
d) gamma rays
b) infrared
________ can cause arc flash and tanning/burning of the skin, increasing your risk for cancer
a) ultraviolet
b) infrared
c) invisible x-rays
d) gamma rays
a) ultraviolet
Plasma cutting temps range from
a) 10,000 - 15,000 °F
b) 15,000 - 18,000°F
c) 18,000 - 25,000°F
d) 20,000 - 26,000°F
c) 18,000 - 25,000°F
What 3 metals can cause cancer
Cadmium, Beryllium, Nickle
Zinc, Copper oxides, & Nickel can cause ___
a) hypersensitivity pneumonitis
b) organic dust toxic syndrome
c) metal fume fever
d) phosgene gas
c) metal fume fever
Chlorinated degreasers when heated produce ________
a) hypersensitivity pneumonitis
b) organic dust toxic syndrome
c) metal fume fever
d) phosgene gas
d) phosgene gas
What are the 3 types of ventilation
natural - breeze
general mechanical - air pumped in and vented out (4/hr)
local exhaust - capture at the source and vented at, at least 100cu ft/min
What is the most common hazard in a shop?
Noise
Best clothing for welding in order
1.
2.
3.
- Leather
- Wool
- Cotton
A class “A” fire is from what type of materials
a) combustable metals
b) electrical
c) kitchen materials
d) paper & wood
d) paper & wood
A class “B” fire is from what type of materials
a) combustable metals
b) electrical
c) kitchen materials
d) flammable liquids
d) flammable liquids
A class “C” fire is from what type of materials
a) combustable metals
b) electrical
c) kitchen materials
d) flammable liquids
b) electrical
A class “D” fire is from what type of materials
a) combustable metals
b) electrical
c) kitchen materials
d) flammable liquids
a) combustable metals
A class “K” fire is from what type of materials
a) combustable metals
b) electrical
c) kitchen materials
d) flammable liquids
c) kitchen materials
__________ is the electromotive force that pushes the current through the circuit
a) amperage
b) voltage
c) current
d) slope
b) voltage
______ controls the starting of the arc and maintains the arc and puddle fluidity.
a) amperage
b) voltage
c) current
d) slope
b) voltage
______ is responsible for; metal deposition rate, & penetration
a) amperage
b) voltage
c) current
d) slope
a) amperage
A DC ______ type welder has AC input and DC output.
a) inverter
b) transformer
c) rectifier
d) current
c) rectifier
An AC ______ changes AC to DC and then back to AC at a higher frequency then transforms it to welding voltage/amperage then changes it back to DC one last time producing the smoothest arc.
a) inverter
b) transformer
c) rectifier
d) current
a) inverter
A _____ in a welder changes AC to DC
a) inverter
b) transformer
c) rectifier
d) current
c) rectifier
Straight polarity the electrode is connected to the _____ terminal of the welder
positive or negative
DCSP = negative terminal
Reverse polarity the electrode is connected to the _____ terminal of the welder
positive or negative
DCRP = positive terminal
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