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How much oxygen goes into a Bunsen burner when the flame is blue?
In a Bunsen burner with a blue flame, the ratio of oxygen to gas is approximately 1:3. This means that for every molecule of oxygen, about three molecules of gas are present in the mixture. This ratio allows for complete combustion of the gas, resulting in a clean, blue flame.
When you give it more air the flame get yellow?
A yellow flame indicates incomplete combustion due to insufficient oxygen, which can be caused by providing too much fuel or inadequate airflow. Adjusting the air intake can help balance the fuel-to-air ratio and produce a blue flame, which is a sign of a clean and efficient burn.
What is the maximum temperature that can be achieved by the yellow flame of a Bunsen burner?
The maximum temperature that can be achieved by the yellow flame of a Bunsen burner is around 1,000 to 1,300 degrees Celsius. The temperature can vary depending on the air-to-gas ratio and the quality of the burner.
Which compressed gases are used for welding?
Some common compressed gases used for welding include acetylene, argon, carbon dioxide, and helium. These gases are often used in various combinations depending on the welding process and materials being joined.
What is reaction of oxygen and acetylene?
it is used for cutting metals ( example with a proper mixture by regulators you use a cutting torch) +++ The mixture as such is just oxygen and acetylene, but acetylene is highly flammable and when additional oxygen is introduced, the flame is hot enough to melt steel to weld it. ' For cutting, the metal is first brought to melting-point or nearly so by the gas flame, then excess oxygen is added to burn rather than melt the iron itself, with the gas flame maintaining the heat input and temperature. The oxy-gas cutting torch differs from the welding torch by a different type of nozzle and having a trigger on its side to operate the cutting-oxygen valve.
Distinguish between an oxidising flame and a carburising flame in oxy- acetylene welding?
Basically, you need to look at the flame itself, if the tip of the nozzle is bluish/white, and long , then the flame is a carburising or reducing flame, it contains a high ratio of acetylene compared to oxygen, and will produce a cooler sooty flame. this can be used to make metals more malleable when working them, but the carbon is not helpful, and cannot be used for welding operations An oxidising flame is more pupleish/white and is far hotter, with more oxygen than acetylene, this flame is used in cutting, but will harden steel, making it brittle. in between the two is the neutral flame where welding operations are carried out. Images can be seen at: http://www.twi.co.uk/content/jk3.html (not my site)
Which flame is used for welding brass?
natural flame using a mixture of one-to-one ratio of acetylene and oxygen.
What is the general mix of oxygen and acetylene in welding?
A general rule is 3 parts Oxygen to 1 part Acetylene. Other fuel gasses may vary the ratio. This produces a Neutral flame. See the answer to "Types of flames" for more info.
What are uses of each one of the oxyacetylene flames?
There are three distinct types of oxy-acetylene flames, usually termed: -Neutral: The neutral flame will usually have no chemical effect on the metal being welded. -Carburizing (or excess acetylene): It will cause an increase in the carbon content of the weld metal. -Oxidizing (or excess oxygen ): It will oxidize or "burn" some of the metal being welded. The type of flame produced depends upon the ratio of oxygen to acetylene in the gas mixture which leaves the torch tip.
What is the expansion ratio of acetylene?
The expansion ratio of acetylene is approximately 1:668 when it is converted from liquid to gas. This means that one volume of liquid acetylene will expand to form 668 volumes of acetylene gas at room temperature and pressure.
How hot does oxyacetylene get?
Oxyacetylene flames can reach temperatures up to 6,332°F (3,500°C) when burned with the optimal ratio of oxygen and acetylene.
How does oxyacetylene welding work?
Oxyacetylene welding works by using a combination of oxygen and acetylene gas to create a flame with a temperature high enough to melt and fuse metal together. The acetylene gas is ignited, and the oxygen stream is then directed towards the material, creating a focused and intense heat source for welding.
How much oxygen required for a flame?
A flame requires an adequate supply of oxygen to sustain combustion. The exact amount of oxygen needed varies depending on the fuel and the conditions of the combustion process. Generally, a balanced ratio of oxygen and fuel is necessary for efficient burning.
Why oxygen cylinder has greater size than acetylene cylinder?
Oxygen is stored at a much higher pressure than acetylene, which requires a larger cylinder to contain it safely. Additionally, oxygen is less dense than acetylene, resulting in the need for a larger volume to store the same amount of gas.
What are two characteristics of a neutral flame when gas welding?
A neutral flame in gas welding is achieved when the inner cone is sharp and well-defined, and the outer envelope is steady and light blue in color. It provides a balanced ratio of oxygen and acetylene, resulting in efficient heat transfer and clean welds.
Why is it that when the air hole is closed the flame becomes yellow?
When the air hole is closed, the ratio of fuel to oxygen is unbalanced. This leads to incomplete combustion and the production of soot, which appears yellow. In contrast, a blue flame is a sign of complete combustion when the fuel and oxygen are properly balanced.
What causes a burner flame to be smoky and to separate from the tip of the burner?
A smoky burner flame that separates from the tip of the burner is typically caused by an incorrect air-to-fuel ratio. This can be due to a clogged burner or inadequate airflow. It can also be caused by a lack of proper maintenance or adjustment of the burner.
