Exam 1 Flashcards
1
Q
The base metal used on resistance spot welders are made up of ______.
A
Copper
2
Q
Fusible plugs in acetylene cylinders are located in the ___ and _____ of the cylinder.
A
Top and Bottom
3
Q
What is the temperature of an acetylene flame?
A
800 C (1472 F)
4
Q
Spray transfer is used for joining materials (_/__”) and greater in thickness.
A
3/32”
5
Q
What does MIG stand for?
A
Metal Inert Gas
6
Q
There are two types of welding wire or filler wire metal that can be used in the GMAW process:
_____ wire
___ ___ wire
A
Solid wire
Flux Core Wire
7
Q
____ cycle is the number of minutes out of a __-minute time period that welder can be operated at it maximum rated output.
A
Duty cycle
10-minute
8
Q
The maximum safe pressure for acetylene is considered to be __PSI.
A
15 PSI
9
Q
What does the chemical symbol/formula look like for Acetylene?
A
C2H2
10
Q
Acetylene cylinders must always be used in an _____ position,
A
Upright
11
Q
_____ ____ are installed in the cylinder to allow a controlled release of acetylene in the event of fire.
A
Fusible Plugs
12
Q
What should you do before heating or cutting?
A
Let others know
13
Q
If the material being heated or cut contains cadmium or lead, A _____ ___ respirator must be used.
A
Fresh Air
14
Q
Acetylene and oxygen hoses must be able to withstand a minimum burst pressure of ___PSI.
A
400PSI
15
Q
A carbonizing flame can be used for heating, but adds _____ to steel (hardens it).
A
Carbon
16
Q
If ___ or _____ is exposed to pure oxygen, an explosion can occur without a flame or spark present.
A
Oil or Grease
17
Q
When using oxygen the valve must always be _____ open.
A
Fully
18
Q
The ______ the number is the darker the lens will be.
A
Higher
19
Q
When and oxygen container is full at room temperature __ºC (__ºF), a standard-sized oxygen cylinder has a pressure of ____ psi and holds a volume of _._m³
A
21ºC 70ºF 2200 PSI 6.9m³
20
Q
A _______ attachment is designed to preheat the metal to its kindling temperature.
A
Cutting
21
Q
A ____ ____ also known as a ______, is a tangle of wire located between the feed rollers and the liner.
A
Birds nest
Pileup
22
Q
_______ are electrical components that convert input alternating current (AC) line voltage to direct current (DC) voltage.
A
Rectifiers
23
Q
With an aluminum contact tip, the tip should be 0.005” ______ than the size of the wire.
A
Larger
24
Q
Rotate the regulator pressure-adjusting screw clockwise to ______ pressure ; rotate it counter-clockwise to ______ the pressure.
A
Increase pressure Decrease Pressure
25
Acetylene is very unstable when compressed beyond \_\_PSI. The critical pressure for acetylene is __ PSI.
15 PSI 28 PSI
26
STRSW are created by combining \_\_\_\_, pressure and \_\_\_\_.
Heat, pressure and time
27
A tip should be operated in \_\_\_-working range, which is between smoke range and \_\_\_\_\_\_\_.
mid-working blowoff
28
When welding attach the ____ lead connection as _____ as possible to the welding location.
work
close
29
When welding aluminum manufacturers recommend using a minimum #\_\_ shade lens.
#10 shade lens
30
A ________ occurs when the flame goes inside the torch and continues to burn.
flashback
31
When using oxyacetylene equiptment for heating, the acetylene regulator is adjusted to the pressure used when ________ the torch.
balancing
32
Non-fusion welding is an _______ process not a _____ process.
Adhesion Fusion
33
Most welding manufacturers suggest a gas flow rate between __ and __ cfh.
15 and 35 cfh
34
\_\_\_\_\_\_\_ is an alcohol derivative that has the ability to absorb acetylene.
Acetone
35
When cutting with the torch, thinner materials require more _________ than thicker materials.
inclination
36
What does MAG stand for?
Metal Active Gas
37
Can you weld steering or suspension components on a vehicle? Why?
NO, you don't know what properties may be changed or destroyed by welding.
38
The acetylene valve must ___ be ____ open.
Not Fully
39
As cylinder pressure decreases, the outlet pressure from a pressure regulator remains \_\_\_\_\_\_\_.
constant
40
Spray transfer occurs when using _____ \_\_\_\_\_\_ _____ \_\_\_\_\_\_ (DCEP).
Direct-current Electrode Positive
41
All components are tightened enough that they will not ____ when \_\_\_\_-tested.
Leak Leak-tested
42
What is the most suitable welding lens for cutting and welding light gauge metal?
#4 Green
43
Pull type welder systems are usually hand-held units called _____ guns.
Spool
44
The _______ transfer occurs when the weld metal passes through an open arc in the form of large globules.
Globular
45
\_\_\_\_\_\_\_\_\_ is the length of the welding wire or electrode as measured from the contact tip.
Stickout
46
The regulator connection on a welding gas cylinder valve is \_\_\_\_-\_\_\_ thread.
Right-hand thread
47
A longer stick out ________ the electrical resistance in the circuit and reduces the current available for maintaing the arc
increases
48
What does AWS stand for?
American Welding Society
49
On a cutting torch the acetylene pressure should be set to _ PSI and oxygen to __ PSI
5 PSI 20 PSI
50
\_\_\_\_\_\_ welding requires the base metal to be fully melted into the area of the joint.
Fusion
51
When an acetylene tank is full at a room temperature \_\_º C (\_\_ºF), a standard-sized acetylene cylinder has a pressure of 1725 kPa (\_\_\_PSI).
21ºC 70ºF 250 PSI
52
It is estimated that \_\_% to \_\_% of oem welds on unibody cars are done with STRSW
90% to 95%
53
The voids within the porous material inside an acetylene cylinder are filled with liquid \_\_\_\_\_\_.
Acetone
54
One part of an oxygen valve contains a ______ or ___ \_\_\_\_ to prevent excessive pressure in the cylinder.
Frangible Burst Disk
55
Do not permit ___ or ______ to come in contact with oxygen cylinders, valves, regulators or other fittings.
Oil or grease
56
A torch can also be referred to as a _____ \_\_\_\_\_.
Torch Handle
57
\_\_\_\_\_\_\_ tips use more gas, produce larger flames and therefore generate more \_\_\_\_.
Larger Btu's
58
Fusible plugs melt out at \_\_\_ºC.
100ºC
59
Which form of metal transfer ideal for joining light-gauge metals for fit-ups or wide gaps?
Short circuit
60
Plasma Arc equipment is used for \_\_\_\_\_\_.
Cutting
61
\_\_\_\_\_\_\_ is described as gas pores in the solidified weld bead.
Porosity
62
The heat output of a tip is measured in?
British Thermal Units (BTU)
63
Regulators perform 2 functions, name them.
1. Reduce cylinder pressure to a usable working pressure 2.Maintain constant pressure, regardless of pressure changes in the cylinder.
64
\_\_\_\_\_\_\_\_\_ are electrical devices that transform a high input voltage to a low working voltage.
Transformers
65
Acetylene gas can be smelled at a concentration of \_% in the air.
1%
66
\_\_\_\_\_\_\_ is formed when he oxygen in the atmosphere comes in contact with the intense ultraviolet ligh radiation produced by an open arc.
Ozone
67
When the welding or cutting operation is completed, close the torch valves according to the ____________ recommended procedures or the practices adhered to by your \_\_\_\_.
Manufacturer's recommended Shop
68
The regular connection on an oxygen cylinder valve has a \_\_\_\_\_-\_\_\_ thread.
Right-Hand Thread
69
What does GMAW stand for.
Gas Metal Arc Welding.
70
\_\_\_\_ welding fuses two pieces of metal together by forcing a molten puddle through the top layer of metal and onto the bottom layer.
Tack welding
71
In GMAW short-circuit welding with a \_.\_ mm (3/8) stickout is most often recomended to start with.
9.6mm
72
Which light ray can cause eye strain or even temporary blindness?
Visible Light Ray
73
Where the problem may involve repairs to the internal electical circuits, repairs must be done by a qualified _____ technician.
Repair
74
Lack of penetration, also called ____ lapping, and occurs when there is a lack of fusion between the weld metal and the surface of the workpiece.
Cold lapping
75
The _______ welding mode uses a series of pre-timed arc-on/arc-off sequences to allow for cooler welding.
Stitch Welding
76
A hole that measures approximately _ mm (1/8") in diameter must be formed by tearing.
3mm
77
When cutting ferrous metals without coatings, iron oxide fumes are given off. ______ shop ventilation should be adequate.
Normal
78
If back flow prevention isn't in place and the acetylene torch valve is faulty, the higher pressure _____ may force its way into the acetylene passages and create a dangerous situation.
oxygen
79
Ray produced by the arc can be __ times stronger than the sun.
10 times
80
The light rays given off by oxyacetylene are both ______ and \_\_\_\_\_\_\_\_\_.
Visible and Invisible
81
The burst disc on a welding cylinder, sometimes known as a frangible disk, will rupture at ____ psi.
3200 psi
82
\_\_\_\_\_\_\_\_ is defined as the melting away of the plate metal and failure to fill it back in with weld metal.
Undercut
83
The most suitable lens for heating, cutting and welding light gauge metal is a __ or __ in a green shade.
#4 or #5
84
Occasionally, you will need to use oxyacetylene equipment for \_\_\_\_\_\_\_, _______ or \_\_\_\_\_\_\_.
Heating Cutting Welding
85
Tack welds are places approximately 13mm \_/\_" in from the ends of the weld and are spaced approximately 25mm to 30mm \_" to 1 \_/\_" apart along the entire length of the weld
1/2"
1" to 1 1/4"
86
Oxygen used for oxyacetylene equipment is \_\_.\_% pure oxygen.
99.5%
87
When leak-testing set the acetylene pressure to _ psi and the oxygen pressure to __ psi.
4 psi 15 psi
88
An extension on the nozzle beyond \_.\_mm (1/8") is not recommended, as the shielding gas envelope may become ineffective at protecting the weld puddle.
3.0mm
89
\_\_\_\_\_\_\_\_\_ is the process of ridding the molten weld puddle of oxygen.
Deoxidization
90
If acetylene pressure is increased, the flame will leave the tip. This is referred to as \_\_\_\_\_\_\_.
Blowoff
91
What is the temperature of a neutral flame?
3232 C 5850 F
92
The purpose of the _______ \_\_\_ is to transfer the welding current to the wire.
Contact Tip
93
The _____ directs shielding gas onto the weld zone to prevent atmospheric contamination of the molten puddle.
Nozzle
94
Which style of GMAW travel produces a flatter bead shape and less penitration?
Forehand
95
What is the temperature of a Carbonizing flame?
3149 C 3177 F
96
What is the flame called that has equal parts of acetylene and oxygen?
Neutral Flame
97
The regulator on a welder is measured in _______ flow, _____ feet per _____ (CFH) or _____ per minute (L/min).
Volumetric flow
Cubic feet per hour
Litres per minute
98
When heating or cutting metal with galvanized coating, zinc oxide fumes are given off. An __ \_\_\_\_\_\_ respirator is best.
Air Supplied
99
For a lap joint, one peice of metal is laid on top of another, overlapped by \_mm to \_\_mm.
6mm to 12mm
100
The way that weld metal transfers across the arc from the end of the electrode of the weld zone is called the ____ \_\_ _____ \_\_\_\_\_\_\_.
Mode of Metal Transfer
101
When doing a straight cut always attempt to start a cut from an \_\_\_\_, projection or hole.
edge
102
The ____ weld is produced by drilling or punching a 6mm to 8mm hole in the top layer of metal.
Plug weld
103
The battery should always be ______ to protect the vehicle's electrical components.
disconnected
104
Use only ______ gas whe welding aluminum and keep the volume on the regulator between __ and __ CFH.
Argon
30 and 50 CFH
105
Spray transfer uses atleast \_\_% argon, and by increasing the welding current above the critical value called the ________ current.
85%
Transision Current
106
When cutting a nut or bolt, hold the prehead flame \_mm from the nut.
3mm
107
The ______ speed feed motor is usually opertated by ____ \_\_\_\_\_ (DC) and is controlled by an electronic governer connected to the control system.
Variable speed
Direct Current
108
What are the other names used for a Carbonizing flame?
Carburizing ; Reducing
109
A ________ is momentary extinguishment of the flame..
backfire
110
What does CSA stand for?
Canadian Standards Association
111
Name the types of flames in order. 1. 2. 3. 4.
Acetylene Flame Carbonizing Flame Neutral Flame Oxidizing Flame
112
Non-Ferrous metals such as aluminum, copper, nickel and bronze and alloys of these materials _______ be cut using oxyacetylene equipment.
cannot
113
\_\_\_ ____ (amps) and ____ (volts) controls are usually located on the front of the machine.
Wire speed (amps)
Heat (volts)
114
When a cylinder requires refilling, it should be marked with the letter \_\_.
MT
115
Which light ray is both ultraviolet and infrared?
Invisible Light Ray
116
\_\_\_ ___ wire is a type of welding wire that requires no external shielding gas.
Flux Core Wire
117
The high-pressure gas cylinder valve is a \_\_\_\_\_-seat valve.
Double-seat
118
Hold the torch with both hands and bring the tips of the preheat flames to within \_\_mm of the material surface.
1.5mm
119
\_\_\_\_ oxide is present in all welding applications.
Iron
120
Welding guns are usually angled at a \_\_° angle to the handle.
45
121
Where can you find the contents of a cylinder?
WHMIS Label
122
A welding cylinder pressure at room temperature is ____ psi.
2000 psi.
123
What is the temperature of an oxidizing flame?
3482 C 6300 F
124
Which type of flame removes carbon and iron from the steel?
Oxidizing
125
Both AWS and CSA recommend an AWS-\_\_\_-\_ (0.023") wire for the autobody industry.
AWS-E70S-6 (0.023")
126
The ____ lead is the ground connection.
Work
127
\_\_\_\_\_\_ are considered the most serious of all weld defects because they often lead to complete failure of the weld.
Cracks
128
The use of correct _____ \_\_\_\_\_\_\_\_ (slope in the direction of travel) is important to both the quality and speed of the cut.
Torch inclination
129
Short-circuiting metal transfer will short circuit __ to ___ times/second.
20 to 200
130
\_\_\_\_\_ and ____ shielding gasses are the only true inert gasses used in GMAW.
Argon and Helium
131
\_\_\_-\_\_\_\_\_ welding does not involve the melting of the base metal.
Non-Fusion
132
\_\_\_\_\_\_\_ are lengths of unmelted wire protruding from the underside of the weld.
Whiskers
133
The term ____ \_\_\_\_ refers to the maximum volume of acetylene that can be taken from the cylinder without drawing acetone liquid along with the acetone gas,
Draw Limit
134
Acetone can absorb ___ times its own volume of the acetylene gas.
420 Times
135
A ____ type drive welder has a wire drive system house in or on top of the machine and pushed the welding wire into the cable assembly.
Push type drive
136
An oxygen regulator has \_\_\_\_-\_\_\_ threads and acetylene regulators have \_\_\_\_-\_\_\_ threads.
Right-Hand Threads Left-Hand Threads
137
\_\_\_\_-\_\_\_\_\_\_ is defined as excessive penetration in a localized area.
Burn-Through
138
The regulator connection on an acetylene cylinder valve has a \_\_\_-\_\_\_ thread.
Left-Hand Thread
139
Before oxyacetylene equipment is put to use, all fittings should be leak tested with \_\_\_-\_\_\_\_\_\_ ____ and \_\_\_\_\_\_.
Non-detergent Soap Water
140
When you start a weld and the wire comes in contact with the base metal and fails to start an arc immediately, you are experiencing a condition known as \_\_\_\_\_\_.
Stubbing
141
Aluminum _______ must be removed prior to welding; otherwise, it will contaminate the weld.
Oxidization
142
Whats the method called that only transfers filler wire when in direct contact with the base metal?
Short-circuit metal transfer
