Shop TQ Prep Flashcards
If you had a 120 ton brake and you are braking a 6’ piece of material how many tons per foot would you have?
20 tons per foot of breaking power
What is the allowance for inside dimensions?
Add 20%
What is the allowance for outside dimensions?
Subtract 80%
What is the amount of travel of the moving beam that is adjustable on press brakes?
Stroke Length
What is the distance between the lower surface of the top beam and the upper surface of the bottom beam when the moveable beam is at its maximum stroke length with no dies in place?
Opening height
Name three types of bending on a power press brake.
Coining-stamping, Bottom bending, Air bending
What is the name of the upper and lower bending tool on a power brake?
Upper is punch, bottom is die
What do stainless steel, aluminum, and zinc have in common?
Difficult to work with
What is the protective coating on stainless steel?
Chrome Oxide
When TIG welding, what shade lens number is required?
10-12 shade
After welding an alloy, how is the finish restored?
Polish and Buff
Which power hand tool removes small punches of metal?
Nibbler
Why is a throatless bench shear’s blade clearance so important?
For a clean cut with no burr
Which machine is used to form the male side of a Pittsburgh?
Easy edger
What must be adjusted when forming a female Pittsburgh on a hand brake?
Upper leaf
What is the proper distance between a stack and conical cap?
½ diameter of stack
When joining two pieces of metal, how much should a solid rivet stick through?
1½ diameters
How are spot welder tips held in place?
With tapers
What is the best welding joint for a longitudinal seam on 16 gauge mild steel?
Lap
Where does flashback occur?
Inside the line and torch handle
When bending 10 gauge aluminum on a hand brake, how far should the top leaf be set back?
3 metal thicknesses
What is the purpose of lacquer on brass?
Oxidizing
What is the double seam allowance for the bottom piece of a cylinder?
2W
Which flux is used to seal a Galvanized gum cup?
Muriatic
What is the best gas for welding a non-ferrous metal?
Argon
In GMAW welding, what are the control adjustments?
Wire speed and voltage
Can you fusion weld the inside corner of a 90° corner?
No
How is the diaphragm at the regulator of an oxy-acetylene adjusted to release gas?
Turn in adjusting screw, open valve handle
What is the bend allowance for a 1” outside finished measurement on 10 ga. mild steel?
1” - 1t
Does all GMAW need shielding gas?
False
What is the best material to wear while welding?
Heavy denim
What must cylinders being stored or transported have?
Valves closed and protective caps securely in place
What is recommended for residual pressure in a depleted cylinder?
At least 25 psi
What is the most common mode of metal transfer when welding coated steel or stainless steel?
Short circuit transfer
What effect does changing the wire speed have on the voltage or amperage in the welding process?
The current varies with the amount of wire feed, increasing proportionately
What defect is most often produced by improperly stored wires?
Porosity
What kind of gases are Argon and Helium?
Inert gases
What is pure argon used for?
As a shielding gas when welding non-ferrous metals
What is carbon dioxide primarily used for?
Welding mild steel and low alloy steels
What does helium provide when used as a shielding gas?
Uniform penetration pattern and broader weld bead result
What is the V Die Opening?
Dimension of the opening of the bottom die
How are all power brakes rated?
In tons
If you are using a 120-ton brake that measures 10 feet in length, how many tons of braking power per foot do you have?
12 tons of braking power per foot
What happens as the material becomes shorter in a brake?
The pressure becomes greater
What is the correct formula for calculating a mitre in the field?
M=O×W/L
Which of these materials is the most acid resistant: lead, steel, tin, copper?
Lead
What does the hold down on a squaring shear act as?
A clamp to hold the metal in place and a safety guard
When fabricating stainless steel fittings in a hand brake rated for 16ga mild steel, what gauge should not be exceeded?
20 Gauge
What is the working pressure for acetylene?
15 lbs
Why is more amperage required to TIG weld aluminum than stainless steel of the same thickness?
Aluminum is a better conductor of heat
What is the allowance for an elbow seam?
⅛”
How are copper sheets sized?
Ounces per square foot
What type of welding uses ARGON as a shielding gas?
TIG
When bending 26ga galvanized material, how should the top leaf be set back?
1 metal thickness
How is spring back compensated when bending sheet metal?
By over bending
What safety device is found in acetylene tanks to prevent them from exploding?
Fusible and safety plug
What polarity is used for carbon arc welding?
DC negative
What is the most malleable material?
Copper
What is the primary function of a shielding gas?
Protect the puddle from atmospheric contamination
What is ferrous metal?
An alloy containing iron
What is bronze an alloy of?
Tin and copper
Which way are the threads on an O2 tank?
Right hand thread
What type of snips are specifically designed for cutting light gauge round pipe?
Double cutting snips
What is the main difference between ferrous and nonferrous materials?
Ferrous metals contain iron
What is the purpose of flux?
Remove oxides and prevent them from reforming during the soldering process.
What type of gas is used to weld aluminum?
Argon which is approximately 1.4 times heavier than air.
What is the typical flow rate for argon-oxygen shielding gas?
25 CFH (cubic feet per hour).
What causes porosity in the weld metal?
Moisture.
When can the guards on a power shear be removed?
Never, they are there for your safety!
How much residual pressure at pounds per square inch should remain?
25 psi
Name the three basic types of metal transfer methods in GMAW welding.
Short circuit transfer
What sets the arc length and wire speed in welding?
Voltage sets the arc length and wire speed sets the heat
If voltage is too low and wire speed is too high, what is this referred to?
Stubbing
What type of welding does not require a shielding gas?
FCAW Flux cored arc welding
What can be left on the mat if the shear knives are not kept sharp?
Burrs
What is the piece that is mounted directly in front of the hold down fingers?
Knife guards
What is the angle made between the upper and lower shear knives?
Rake angle
Is it better to have a lower rake angle?
True
The cut will be of better quality.
How are the blades kept in proper position on a swing beam style shear?
A drive system pivots the moving blade down on roller bearings
This mechanism ensures the blades maintain their alignment during operation.
What type of shear only uses power when it is activated?
Direct drive mechanical shear
This type of shear is designed for energy efficiency.
What material thickness can mechanical shears typically cut?
To 10 gauge and 12
Mechanical shears are optimized for cutting specific material thicknesses.
What is the flat horizontal portion in front of the shear called?
The bed
The bed provides a stable surface for the material being cut.
What is used on the side of the shear that keeps the material at 90 degrees?
Side gauge
The side gauge helps in aligning the material for accurate cuts.
What part on the shear is adjustable, allowing you to make multiple cuts?
Back gauge
The back gauge can be set to specific measurements for repetitive cutting tasks.
True or False: Mechanical shears are slower than other types of shears.
False
Mechanical shears are known for their speed and efficiency.
Power shears are electrically run with the motor being of what two types?
Hydraulic or mechanical
What is the cutting capacity range of power shears?
From 30 gauge to in excess of 1/4” plate steel
This indicates the thickness of material that can be cut.
What does stainless steel do to the shear’s capacity?
Reduces the shear’s capacity
The specific percentage reduction is not provided.
What is required to keep the blade beams in alignment on guillotine type shears?
Guiding system
This ensures precision during cutting.
What can be adjusted on a guillotine type machine to suit the length of the cut?
The rake angle
Adjusting the rake angle can improve the quality of the cut.
Good cuts cannot be expected on a strip that is smaller than _______.
8 times
This refers to the minimum size requirement for achieving quality cuts.
How many times the material thickness should the die opening be if you are air bending material over 1/2” thick?
10 times the material thickness
This ensures proper bending without damaging the material.
What can be done to ensure the most accurate method to determine bend angles?
Test piece
Using a test piece allows for adjustments before the actual material is bent.
What is the biggest disadvantage of air bending?
Inconsistency of the bends due to the variation of metal thickness and strength
Air bending relies heavily on uniform material properties.
Is it ok to bend material using numbers above the bolded numbers?
No, it is dangerous and will cause unsafe pressures
Exceeding recommended limits can lead to equipment failure or accidents.
Is it acceptable to remove the guards on a power shear?
No
Guards are essential for safety and should never be removed during operation.
What are the two design types of power squaring shears?
Guillotine (slider)
These types of shears are commonly used for cutting sheet metal.
What is the name of the upper bending tool on a power brake?
Upper is punch
The lower tool is referred to as the die.
What die can be used to straighten out material that has been formed?
Flattening die
What are 2 disadvantages of working with rubber dies?
- They deteriorate much faster
What type of die can be used if a quality finish is desired?
Roll form or rotator dies
Which is the most accurate method of bending?
Coining
Which method of bending produces sharp corners with consistent accuracy?
Bottom bending
How many times the material thickness should the die opening be when air bending material up to and including 1/2” thick?
8 times the material thickness
