Table of Contents
Cards Term 1. What elements make up all hydrocarbons? Definition Hydrogen & carbon. Term 13. Which fuel gas has the strongest odor and is easiest to detect? Definition MAPP Term 14. What is the major advantage of using propane or natural gas? Definition For heating, and natural gas does not have cylinders.
Which of the following fuel gases has the highest flame temperature?
Acetylene produces the highest flame temperature of all the fuel gases. The maximum flame temperature for acetylene (in oxygen) is approximately 3,160°C compared with a maximum temperature of 2,828°C with propane.
Why is a neutral flame the most commonly used oxyacetylene flame used?
A Neutral flame is achieved when there are equal amounts of Oxygen and Acetylene. A Neutral Flame is so named because it has no chemical effect on the molten metal. A Neutral Oxy Acetylene Flame is used for Welding, Brazing and Silver Soldering most metals and is therefore the most common type of flame to use.
What metals can be cut with the oxyfuel gas process?
What metals can be cut with the oxyfuel gas process? Any metal that will rapidly oxidize, such as iron, low-carbon steel, magnesium, titanium and zinc.
What is acetylene gas made of?
Acetylene is made of two hydrogen and two carbon atoms and is chemically represented as C2H2. This hydrocarbon is produced by one of two processes— chemical reaction or thermal cracking, using different types of raw materials.
Why was MAPP gas discontinued?
It is no longer used much in any large-scale industry – for larger scale users acetylene/oxygen is more economic than MAPP/oxygen when high flame temperatures are needed, and propane/air is more economic when big overall heating is needed.
What is the flame temperature of water gas?
Flame Temperatures Fuel Flame Temperature hydrogen 2,660 °C (oxygen), 2,045 °C (air) MAPP 2,980 °C (oxygen) methane 2,810 °C (oxygen), 1,957 °C (air) natural gas 2,770 °C (oxygen).
Which of the following flame is harmful to steel?
6. Which of the following flame is harmful to steel? Explanation: Oxidizing flame is harmful to steel. An oxidizing flame should not be used for welding steel because the deposited metal will be porous, oxidized and brittle.
Which flame is used for cutting?
The neutral flame is the flame most generally used when welding or cutting.
What are the 3 types of flames?
There are three types of flames natural flame, carburizing flame and oxidizing flame.
What should never be welded on?
Never do any welding, cutting, or hot work on used drums, barrels, tanks, or other containers. Mark metal “HOT” with a soapstone.
What material Cannot be cut?
Researchers claim the material, known as Proteus, cannot be cut. In fact, it’s so tough it destroys any tool that attempts to slice into it. Natural materials like diamond and sapphire are strong because of the dense lattice of atomic bonds, but they’re inflexible.
What is the most widely used fuel gas used for cutting?
OXY-FUEL WELDING AND CUTTING. Oxy-fuel welding/cutting, also called oxy welding, acetylene welding, or gas welding is a method of using fuel gases and oxygen to weld and cut metals. Oxy-fuel is one of the oldest welding and cutting processes with the most widely used fuel gas being acetylene.
What does acetylene gas smell like?
Acetylene is a colorless and odorless gas. Commercial grade Acetylene may have an Ether-like or garlic-like odor.
Is acetylene gas poisonous?
INHALATION: Acetylene, at concentration below the LEL of 2.5% (25000 ppm), is essentially non-toxic. At higher concentrations, Acetylene has anesthetic effects. Symptoms of over-exposure to such high concentrations may include drowsiness, dizziness, and a general feeling of weakness.
Does acetylene burn without oxygen?
Decomposition is a chemical reaction whereby acetylene breaks down into its constituent elements, carbon and hydrogen. This reaction gives out a great deal of heat, which can cause the gas to effectively ignite without the presence of air or oxygen.
What replaced MAPP gas?
BLUEFIRE Modern MAPP is a modern substitute to the traditionally known MAPP fuel gas, which was discontinued since 2008. Currently, our product is the only real original MAPP gas substitute available in the North American Market.
Is map-pro the same as MAPP gas?
MAP-pro is a fuel gas composed of only propylene and propane. Therefore, the key difference between MAPP gas and MAP-pro gas is that MAPP gas is mainly composed of methylacetylene, propadiene and propane molecules, whereas MAP-pro gas contains propylene and propane only.
How hot can MAPP gas get?
MAP-Pro fuel has an in-air flame temperature of 3,730 degrees Fahrenheit.
How hot is a natural gas flame?
While both propane and natural gas burn at the same temperature—3,560˚ Fahrenheit—what you get when they burn is actually quite different. You get more energy with a unit of propane than you do with natural gas. One cubic foot of natural gas generates about 1,012 BTUs (British Thermal Units) of heat.
What’s the hottest burning gas?
Fuel Gas & Melting Temperatures Fuel Gas Max Temperature Acetylene 3300°F Propane 2800°F Hydrogen 2650°F MAPP® 2900°F.
Does oxygen ignite?
High concentrations of oxygen used during surgeries are a potential fire hazard for patients, but that doesn’t mean the O2 gas itself catches fire. Oxygen makes other things ignite at a lower temperature, and burn hotter and faster. But oxygen itself does not catch fire.”Jul 15, 2014.
When welding is done by gas flame then it is known as *?
1. Which of the following types of fuel gas is commonly used in gas welding? Explanation: Gas welding is usually referred as oxy welding or oxy-fuel welding which is a process of joining metallic materials by application of heat produced by the gas flame.
What are the safety precautions for gas cutting?
Keep Grease and Oil Away: Control valves and fittings should be kept free of oil and grease. Never operate cylinder valves and parts with oily and greasy hands. 4. Ensure Flame Arresters Are Properly Fitted: Ensure non-return valves and flame arresters are fitted in the acetylene and oxygen cylinder lines.
Does welding melt metal?
Joining Metals As opposed to brazing and soldering, which do not melt the base metal, welding is a high heat process which melts the base material. Typically with the addition of a filler material. Pressure can also be used to produce a weld, either alongside the heat or by itself.
Why gas cutting is not possible in stainless steel?
Metals such as aluminum and stainless steel cannot be cut with Oxy/fuel due to the formation of an oxide that prevents oxidation from fully occurring.
What is harsh flame?
For most regulator settings, the gases are expelled from the torch tip at a relatively high velocity, and the flame is called “harsh.” For some work it is desirable to have a “soft” or low-velocity flame without a reduc-tion in thermal output.
What do you turn off first oxygen or acetylene?
OXY-ACETYLENE We recommend closing the oxygen valve first whenever turning off an oxy-fuel torch system especially when Acetylene is fuel. This is only part, but a very important part, of the complete safe operating procedure recommended for torches by Harris.
