What is oxyfuel gas in welding process?
Oxyfuel gas welding is a process that joins metals by combustion of a fuel gas, oxygen, and air mixed in a nozzle and directed at the work surface (5). The most common fuel gas used is acetylene. The fumes generated in this type of welding originate from the base metal, filler metal, and fluxes.
What temperature can oxyfuel flames reach?
The maximum neutral flame temperature of propane in oxygen is 2,822 °C (5,112 °F).
Why are matches never used to light an oxyfuel gas flame?
25. Never use matches or a cigarette lighter to ignite the oxy-acetylene torch; an approved friction lighter should be used. Matches or butane lighters should not be carried in pockets when using the oxy fuel gas welder. 26.
Why is acetylene the most popular fuel gas used for oxyfuel welding?
Acetylene produces a flame temperature of ~3100 degree Celsius along with oxygen. This high flame temperature makes acetylene a suitable choice for gas welding steel. 2. Welding: When burned in oxygen, acetylene produces a reducing zone, which easily cleans the metal surface.
What is oxyfuel used for?
Historically, the primary use of oxy-fuel combustion has been in welding and cutting of metals, especially steel, since oxy-fuel allows for higher flame temperatures than can be achieved with an air-fuel flame.
What is the most common gas used for oxyfuel welding?
Acetylene
Acetylene – This is the primary fuel used for oxy-fuel welding. The benefits are a high burn temperature that makes it ideal for welding high-strength steels and a reducing zone around the weld area that helps clean the metal. Propane – Propane has a much lower flame temperature than acetylene and no reducing zone.
What is the hottest burning gas?
Fuel Gas & Melting Temperatures
| Fuel Gas | Max Temperature |
|---|---|
| Acetylene | 3300°F |
| Propane | 2800°F |
| Hydrogen | 2650°F |
| MAPP® | 2900°F |
What are the 3 types of flames?
There are three types of flames natural flame, carburizing flame and oxidizing flame.
What is the psi of oxygen for welding?
The oxygen pressure ranges between 0.7 to 2.8 bar (10 to 40 psi), depending on the size of the torch tip. A jet of relatively high-pressure oxygen produces the suction necessary to draw the fuel gas into the mixing head. The welding tips may or may not have separate injectors in the tip.
Is oxy acetylene welding still used?
In recent decades, oxy acetylene welding has become obsolete. Our modern arc welders have more consistency and weld faster. However, oxy acetylene cutting is still a commonly used process that is utilized by millions of welders every day.
What are the disadvantages of oxy acetylene welding?
Disadvantages of Oxy-Acetylene Welding : Oxy/Acetylene weld lines are much rougher in appearance than other kinds of welds, and require more finishing if neatness is required.
What are the factors that affect an oxyfuel gas weld?
While there are a number of factors to consider, the following are the root of most common cut quality issues.
- Cutting Speed Too Low.
- Cutting Speed Too High.
- Nozzle Too Far From Surface.
- Nozzle Too Near Surface.
- Excess Cutting Oxygen.
- Excess Preheat Flame.
- Dirty Nozzle.
Is oxy-fuel welding obsolete?
Used in both heavy industry and light industrial and repair operations, oxy-fuel cutting is a process that has been around for decades. However, in recent decades, oxy-acetylene welding has become all but obsolete. Modern arc welders have replaced them with more consistency and faster welds.
Is oxy-acetylene welding still used?
Which material Cannot be cut by the oxyfuel process?
Oxy-fuel cutting cannot cut non-ferrous metals such as aluminum, stainless, brass or copper. Elements such as chromium, nickel, molybdenum inhibit the ability to cut steel with the oxy-fuel process.
Which is the coldest gas?
Absolute zero is the coldest. It is -459 F.
Why is MAPP gas not made anymore?
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 hottest flame in welding?
The outer envelope is small and narrow. Oxidizing flames also produce a distinct hissing sound as you open the oxygen valve. When adjusted properly, the inner cone can reach 6300 degrees Fahrenheit, making the oxidizing flame the hottest flame for gas welding.
What is the temperature of gas welding?
Gas welding is carried out by a flame produced by burning approximately equal volumes of oxygen and acetylene which are delivered at equal pressures from gas bottles to a welding torch. The flame temperature is approximately 3100°C, which is high enough to melt steel and other metals.
What is the proper working pressure for the oxygen during oxyfuel cutting?
The recommended setting is for the fuel gas regulator to be set at 10 PSIG and the oxygen regulator at 45 PSIG. This recommendation applies when cutting less than 1.5-inch steel using propane, propylene, or natural gas.
How much PSI is in a full oxygen tank?
about 2000 psi
A full cylinder will read about 2000 psi (pounds per square inch). the gauge reaches the flow rate your doctor prescribed.
What welding is the strongest?
TIG welding
TIG welding is often considered the strongest weld since it produces extreme heat, and the slow cooling rate results in high tensile strength and ductility. MIG is also an excellent candidate for the strongest type of weld because it can create a strong joint.
What are 3 of the most common problems that happen when oxy-acetylene welding?
Eye injuries, such as discomfort and burns from the intense light and heat emitted from the operation, and cataracts caused by radiation from molten metal, leading to inability to see things clearly, or corneal ulcer and conjunctivitis from foreign particles e.g. slag and cutting sparks.
What are 3 of the most common problems that happen when oxy acetylene welding?
What is the easiest metal to gas weld?
Steel
Steel is the easiest metal to weld, hence why it is the most popular form of metal for welding. In fact, carbon steel is the cheapest metal to buy on the market. Steel welding often involves stick welding, MIG welding, and tig welding.