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91 Cards in this Set
- Front
- Back
The oxy fuel process works by combining |
Iron with oxygen to form iron oxide |
|
Oxy fuel cutting is considered |
Rapid oxidization |
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Carbon steel can be preheated to temp above |
1600 F |
|
Molten metal blown away, a narrow opening is called |
Kerf |
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Oxy fuel is mainly restricted |
Iron based metals |
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The smaller holes on a cutting torch tip form the |
Pre heat flames |
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Larger hole in center of tip is where |
High pressure oxygen flows through |
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Removing a nut without damaging the bolt |
Washing |
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Removing a narrow strip is called |
Gouging and scarfing |
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Prepare a U groove you need a |
Special gouging tip |
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Process that removes thin layer from a thicker section |
Flame scarfing |
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Manual cutting can cut up to |
24 inches thick |
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An oxygen lance will cut up to |
8 feet thick |
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Cutting with a small carbon steel pipe that is attached to supply of oxygen |
Oxygen lance cutting |
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Several layers stacked and cut |
Stack cutting |
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Cutting cast iron it is recomended that you |
Preheat |
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an effective way to cut high carbon and alloy steel is to clamp a |
low carbon steel plate |
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when cutting alloy steel you should use a slight
|
semi circular motion |
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what are considered better processes for cutting non ferrous alloys?
|
plasma arc and air carbon arc |
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iron must be present for |
oxidization to occur |
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a problem when cutting sheet metal will likely be |
bulking and warping |
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distortion can be minimized by |
preheating |
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stack cutting and intermittent cutting can help reduce |
distortion |
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when cutting medium and high carbon steel what can be caused due to too much heat |
hardening is often a problem |
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the best way to avoid surface hardening is to slow the rate of |
cooling |
|
cutting materials 1 inch to 6 inch thick what shade should be used |
4 or 5 |
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if a torch makes a loud popping noise |
backfire |
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three cause of a torch backfire |
1. touching torch to workpiece 2. overheating torch tip 3. not enough gas flow |
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aside from fire damage a _____ can also result in a explosion |
flashback |
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after flashback your equipment will usually need |
Repair and replacement |
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_____ is a coating on galvanized material that is toxic to breath in |
zinc |
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a material used as rust inhibition on steel can produce deadly fumes when heated |
cadmium |
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if oil and greae is brought into contact with pure ____ a violent explosion can occur |
oxygen |
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a mega pascal is _____ times larger than kilopascal |
1000 |
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the chemical symbol for acetlyne is |
C2H2 |
|
acetylene burns at an extremely high |
temperature |
|
when acetylene and oxygen is mixed temperatures can reach up to |
6300 F |
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critical point of a acetylene is |
28 psi at 70 F |
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acetylene cylinders are filled with porous material |
balsa wood |
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acetylene cylinders when filled contain how much pressure |
250 psi |
|
copper and acetylene react together to form |
acetylide which can cause an explosion |
|
natural gas is used in areas where |
it can be piped in |
|
with natural gas, cutting speeds are |
slower than with acetylene |
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the fuel that is stored in liquid form under high pressure is |
Mapp gas |
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cutting with fuel code name Apache your cutting with |
propylene |
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oxygen is available as a gas in ______ or as a liquid form in ______ |
high pressure cylinders and cryogenic |
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the two most common types of oxygen cylinders are T type which holds up too 2600 psi and the K type which holds up to 2200 psi |
T type - 2600 psi K type - 2200 psi |
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at 21 degrees C the pressure in a full K type oxygen bottle would be |
2200 psi |
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the high pressure oxygen cylinder valved is made out of forged |
brass |
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the cylinder valve of an oxygen cylinder is a |
double seal construction |
|
if the pressure inside an oxygen cylinder gets too high, a |
rupture disk will burst |
|
pressure in which oxygen bottles will vent at |
4000 psi |
|
boiling point of oxygen is |
-183 C |
|
cyrogenic containers have |
pressure relief valves as a safety device |
|
acetylene containers have |
fusable plugs |
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an acetylene pressure regulators has much _____ calibration range than an oxygen regulators |
lower |
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the gauge with the higher numbers show the |
cylinder pressure |
|
the gauge with the lower numbers shows the |
working pressure |
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the most widely used type of regulator for everyday cutting and welding is the |
single stage regulator |
|
the most common sized hose for light duty cutting is |
1/4 inch |
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all fitting connectors are made out of |
brass |
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never use ____ or ______ fittings for tubing on acetylene gas systems |
copper or red brass |
|
a combination torch can be used for |
welding and cutting |
|
a heating tip does not have |
oxygen cutting orfice |
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an acetylene manifold system is filled with _______ to prevent the free actetylene from reaching its critical point |
stainless steel rods |
|
a master pattern for cutting irregular shapes is |
template |
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a tracer that uses special tracer ink as a templet is called |
electronic eye tracer |
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CNC stands for? |
Computer numerical control |
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Six signs that you have produced a good oxy fuel cut |
1. Top edge is sharp and straight 2. The surface of the cut in smooth 3. The draglines are vertical 4. Little slag 5. The bottom edge is sharp 6. Square cut |
|
One of the most important factors affecting cut quality is |
Speed of travel |
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When cutting, teflon may be present in what type of material? |
Pipe |
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What type of steel will have surfacr hardening along edges of kerf |
Carbinated steel |
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Non ferrous alloys are difficult to cut because they contain |
Little or no iron |
|
A ferrous alloy is one that contains |
Iron |
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Ferrous alloys are hard to cut cause they produce a ______ on the surface metal |
Protective oxide |
|
Chemical flux cutting is especually useful for cutting |
Stainless steel |
|
Metal powder cutting is a process where a powder containing ____ is injected into the area cut |
Iron |
|
Aluminum cant be cut with oxy fuel cause |
Does not contain iron necessary for oxidation |
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Iron fumes are extremely toxic |
False |
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Where might a welder come upon zinc |
As a coating on sheet metal |
|
What happens when a pressure regulator creeps |
The working pressure increases |
|
Which factor determines the size of hose? |
Length of hose |
|
Injector type torches are designed for use with |
Fuel gases supplied at low pressure |
|
Propane gas requires what kind of cutting tip? |
A specially designed tip |
|
What do you do if cylinder is leaking? |
Dont try and fix it, move to safe place, notify manufactorer |
|
Is stainless steel easy to cut with oxy fuel? |
No cause it has little iron |
|
What are you looking for when preheating metal |
Cherry red |
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Where can you find teflon? |
On a pipe with teflon tape on its threads, toxic |
|
Sheet metal cuts at what degree? |
10-20 degrees |
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Cutting speed to fast issues |
Top edge is sqaure Bottom edge has slag Curved drag lines |
|
Cutting speeds to slow issues |
Top edge round Bottom edge uneven Irregular drag lines |