Laser commonly Known as Light Amplification by Stimulated Emission of Radiation. Laser is a phenomena in which a very narrow or thin beam of intense electromagnetic radiation i.e. light is emitted.
Laser Beam Welding (LBW) is a welding technique or method used to join or link up pieces of metal with the help of a laser technology. The beam provides a concentrated/focused heat(infrared) source, allowing for narrow, deep, precise welds and high welding accuracy. The process is frequently/often used on large scale , such as in the automotive industry to make automotive bodies lighter with a stronger joints.
OPERATION.
Same as Electron Beam Welding (EBW), laser beam welding also has a high power source of order of 1 MW/cm2 which results in small/concentrated heat-altered zones and high heating and cooling rates. The spot size or the focused area of the laser varies between 0.2 mm to 13 mm, due to smaller focus spot its makes the welding laser accurately and precisely. The depth of penetration is proportional to the amount of power supplied but it is also dependent on the location of the focus point. The penetration is maximized when the focus point is slightly below the surface of the work piece.
A continuous or pulsed laser beam may be used depending upon the application. Millisecond-long pulses are used to weld thin materials such as razor blades while continuous laser systems are used for deeper welds.
Laser Beam Welding is a multipurpose process which is capable of welding carbon steels, HSLA steels, stainless steel, aluminum, and titanium. Due to its high cooling rates the cracking is a matter of concern when welding high-carbon steels. The weld quality is high and similar to that of electron beam welding. The speed of weld...
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...rely which means the exhaustion strength of the welded joint will be excellent.
Energy distribution across the beam is generated by the design of the resonant cavity, including mirror curvatures or shape and their relative arrangement. This combination results in photon oscillation within the cavity specific output beam energy patterns, these patterns are called Transverse Energy Modes (TEMs).
The function of all Laser Beam Welding processes whether they be gas (carbon dioxide, helium, neon, etc.) or other lasering sources is based on the principles of the excitation of atoms using intense light, electricity, electron beams, chemicals, etc., and the spontaneous and stimulated release of photons.
The role of focusing lenses in this process is really important because it concentrates the beam energy into a focus spot as small as 0.005 in diameters or even less.
There is a type of welding that utilizes hydrogen, called Atomic Hydrogen Welding. The welding tool is two tungsten steel rods, acting as electrodes, through which passes an arc of electricity. Hydrogen gas is pump through the arc, and the temperature of the arc disassociates the gas into individual molecules, which absorb an incredible amount of heat. When the gas passes through the arc, it reassembles itself, and burns ordinarily, and using oxygen in the air. This is the hottest type of welding process yet; with a flame of over 7232 degrees F. it was invented in 1926, and was used extensively in Germany during WWII.
Friction stir welding is a solid state welding process; this remarkable up-gradation of friction welding was invented in 1991 in The Welding Institute [1]. Figure 1 shows the schematic representation of the Friction Stir Welding process. The process starts with clamping the plates to be welded to a backing plate, so that the plates do not fly away during the welding process. A rotating wear resistant tool is plunged on the interface between the plates to a predetermined depth and moved forward in the interface between the plates to form the weld. The external tool has a probe and shoulder which stirs the material to be joined and forges the surface. FSW comes together with forging and extrusion processes. The probe and shoulder extrudes the material by stirring and the shoulder alone forges the material surface to be joined.
The explosion welding process was discovered in the United States in the 1950’s, and developed in the 1960’s. Also known as explosion cladding, or explosion bonding, the welding process uses extremely high amounts of pressure to bond, sometimes highly dissimilar metals together, such as copper and stainless steel, or aluminum and carbon steel, to make a product with various desirable properties of both metals. According to High Energy Metals Inc. one of the many difficulties of Explosion welding is calculating
Welding is a very important job in today’s society. With new building designs, and bridges to every day metal products, welders are needed to do these tasks. Almost everything that you use every day has some sort of weld to it.
Even though welding has been around for a long time, most of the best inventors were around during the 19th century and have changed the way thing are done today. During the 20th century, many technological advancements developed and have made welding easier because of the different types of welding that have been developed. Welding impacted the world during World War l, because during the war armaments that were going to be utilized were ordered in tremendous amounts. Therefore, welding has been around since the Iron Age and has let people build strong steel and powerful armament such as Weapons, tanks, and planes. Finally, welding has had many advancements, and will continue to do so in the future, because the world needs
Another type of welding is”Tig welding” which is when a electrode such as aluminum or tungsten that is melted with a strong torch or electrical arc. Another type of welding is “Mig welding” that is when you have a spool of wire and a inert gas such as argon or Co2 which acts as an insulator for the arc that is created in order to weld a bead. There are many more types of welding that you can learn when you are studying to become a welder or fabricator. When studing for welding you can and will learn about so much more stuff like oxy torch cutting and flux core welding which i hope many people will have the ability to at least try welding
Welding is a excellent career choice for those who like to build things with their hands and have a strong attention to detail. It requires an extensive amount of knowledge and skill but for those who get a solid grasp of the respected trade they're rewarded with tremendous job opportunities and first-rate pay.
Xie, J. "Weld Morphology and Thermal Modeling in Dual-beam Laser Welding." Was.org. American Welding Society, n.d. Web. 24 Mar. 2014. .
In doing so, they weld metal parts, fill holes, and can even repair cracks in a brace. Because of its heavy duty strength, welds can be used to repair cars, ships, and even airplanes. Also, welds are used in the construction of buildings and bridges. Various tools are needed to perform proper welding techniques, for example, a person may need clamps, welding rods, a chipping hammer, a torch, glasses, a welding helmet, an apron or non flammable clothing to properly weld metal. In addition, a person may also need a specific type of welder for a certain occasions.
There is different types of rods and different types of ways to weld. You need a lot of training for it. There are many schools and colleges you can go to receive welding education. The most common welding processes are Gas Metal Arc Welding, Flux Core Arc Welding, Gas Tungsten Arc Welding and Shielded Metal Arc Welding. The easiest of these is the Gas Metal Arc Welding. Welding options are stick, flux core, tig, and mig. The pipeline tig and stick welds a lot more than the other .The pipeline use many types of techniques but, the most common on the pipeline is downhill root pass and the up hill pass. The median annual wage of welders, cutters, solderers, and brazers is
Welding was invented in the 1900s but lets go back a little to middle age that was when blacksmithing was the best method to use before welding. Now Edmund Davy of England was the one who discovered acetylene in 1836. Some of the others inventors were Auguste De Meritens who worked on how heating of an arc can join two pieces of metal, C.L. Coffin was one one who created a welding process with an electrode. There was other people that helped make welding more efficient. As the years past by welding was getting...
During the middle ages welding was very common. Early Egyptians learned the art of welding. Several of their tools were made by welding. A set of specialized workmen called blacksmiths created tools by melting the metal, then hammering them together. This method did not change much until the dawn of the 19th century which held major breakthroughs in welding. An open flame (acetylene) was very important to the history of welding. It allowed manufactures to make metal tools and equipment. In 1836 a man named Edmund Davy discovered acetylene which was soon utilized in the welding industries. Coated metal electrodes were first introduced in the 1900s. A coating of lime covered the electrode and made the weld much more stable. A number of other welding processes were also invented, such as seam welding, spot welding, flash butt welding, and projection welding. Stick welding also became popular around this time too. In the 1920s automatic welding was first introduced by P.O. Nobel. Automatic welding integrated the use of arc voltage and bare wire. It was mainly used for fixing old, molding metals. Several types of electrodes were also developed during this decade. A new type of welding was developed in the 1940s by Meredith. This became known as Heliarc Welding. Gas shielded arc welding or GTAW was another significant milestone in the welding history. Several advancements in the welding field were made in the 1960s. Dual shield, inner shield, and electro slag were some of the more important kinds developed. Plasma arc was also invented and was mainly used for metal spraying. Even now more techniques are being made. For example, laser welding was developed by the Russians and is being used more and more every day (“Welcome to
Sasaki, Tomoaki. "Study for TIG-MIG Hybrid Welding Process - Springer." Linked.springer.com. Springer, 01 Jan. 2014. Web. 28 Apr. 2014.
Most people don't know where the idea of the laser came from. The idea for the laser came from a machine called a maser. The maser was a tool that was able to strengthen, or amplify radio and light waves. The first laser was made in California in 1960. It was built by Theodore Maiman along with a group of American scientists. The material they used for a concentrator was a man- made ruby. This was done by, coiling a simple flash tube around a rod, and beaming powerful flashes of light at it. The result was pulses of red laser light. Once they made the device they had to name it. They had think of some word or words to described it. They came up with Light Amplification by Stimulated Emission of Radiation. Using the first letter of each main word they named it laser. The laser had everyone excited.
?Automation Reduces Weld Spatter? Welding Design & Fabrication (Jun. 2001): 37 EBSCOhost. Online. Nov. 2002 .