Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
Characteristics personal
Characteristics personal
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: Characteristics personal
Wire-electrical discharge machining (EDM) is a non-traditional machining process in which a pulsed voltage difference between a wire electrode and a conductive work piece initiates sparks which erode work piece material. Removing material in such a way is often advantageous when the work piece material would be difficult to machine with traditional machine tools due to high strength, hardness, toughness, etcetera (Newton, 2008). Due to the process itself, EDM are able to produce any complex shape but at the loss of surface integrity and some other after effect like Kerf width, Heat affected zone and etc. However, the selection of cutting parameters for obtaining higher cutting efficiency or accuracy in WEDM is still not fully solved, even with the most up-to-date CNC WEDM machine. It is due to the hard to expect nature of the process of Wire EDM. As a result, the relationships between the cutting parameters and the process performance are hard to model accurately. The problems arise although the machine itself is very up to date and some people hardly make a research out of it.
Nowadays, the application demands for a material that has best properties in term of strength, corrosion and other properties. The composition of material is then made according to the specific properties demanded. But, the properties also bring disadvantages on what process should be chose to manufacture the material so the composition of the material should be studied earlier before making any decision. The ease and economy with which INCONEL alloy 718 can be fabricated, combined with good tensile, fatigue, creep, and rupture strength, have resulted in its use in a wide range of applications. The examples of applications that use Inconel 718 as their mai...
... middle of paper ...
...
CHAPTER 2
Literature Review
2.1 Introduction
2.1.1 Wire EDM
Electrical Discharge Machine (EDM) is mainly used to cut a very intricate shape which other machines can’t do. Somehow, it’s only usable on the metal based product since electric is the main source for the cutting of product. The process of cutting the metal product is very complicated since lots of factor need to be considered in order to achieve a perfect finish product. The basic process of EDM is that a spark is generated between two electrodes which are tool and work piece. The spark will occur at the narrowest gap between the two electrodes. The sparks generated are very high and the cycle time for each spark is very short. Due to high temperature of the spark, the spark area melts in an instant and vaporized. The residue is then removed by the dielectric fluid contained inside the machining area.
Plasma cutting is a method of cutting through metals by means of an accelerated jet of hot plasma, using a plasma torch. It is a process that is extremely essential for the shaping of metals through cutting away unwanted parts.
Friction Stir Welding facilitates welding of plate to plate joints for several applications. This process is chosen for the welding of AA 6082-T6 (Al-Mg-Si alloy) of various thicknesses. This alloy finds use in structural and other industrial applications. FSW process is especially well suited to butt and lap joints in aluminium. Production of aluminium alloy components is not very complex but joining of these materials can sometimes
“The Industrial Revolution was another of those extraordinary jumps forward in the story of civilization” (Stephen Gardiner). One of the major parts of the industrial process has to do with metal production. Welding has been incorporated into the framework of metalworking. Welding dates back to the middle ages where forge welding processes were used to make tools and weapons, commonly known as blacksmiths. It is known that the Egyptians used forms of welding to make gold tools, jewelry, and decoration. During the 1800’s a new process was formed by using carbon electrodes to form an arc. This was done by Sir Humphrey Davy, which carried on to become Carbon Arc Welding and the most used process during the late 1800’s. As time evolved so did the
]. Some alloying elements sometimes added to impart special characteristics to brass. Lead, which is insoluble in copper alloys, used to improve machinability of leaded brass. However, Pb and Bi or other elements that are used to improve the machinability often deteriorate the low and high temperature ductility of brass [11]. The content of Pb element is varies between 2.5 and 3.5 %, which make the machining processes at high speed and good surface [12]. The solubility of lead in copper alloys is very low therefore, it is found in microstructure as dispersed globules all over the material. These globules lead act as a lubricant decreasing the friction coefficient between the tools and the materials by creating discontinuities of chip fragmentation. Therefore, it makes reducing in cutting force and then, the tools wear rate is minimized [13]. Different alloying elements help to improving the machinability are usually added to brass. The most common element using in this situation is lead, which improving the machinability with
It works by three main ingredients. Electricity, filler metal, and a form of shielding from the air are very important (gowelding para 2). “Just like MIG welding, Flux Core welding works by feeding an electrode continously to the joint” (gowelding para 2).The first step is the welder squeezes the trigger and a spool of wire is fed to the joint into the arc. As soon as the electrode hits the metal it heats it up until the wire and weld area begin to fuse together. Once the puddle is made the Flux Core creates a shield from the air (gowelding para 2). The power supply is a constant voltage power supply. This means the welding machine uses a direct current just like MIG welding, as the same machine is used for both types of
First, let me give you some background information on MIG welding. MIG welding was created in the 1940s and is a type of welding in which a wire is fed through a roller and into a gun. The gun has a trigger that controls the amount of electricity and speed of the wire coming out. Once the wire coming out of the gun touches metal it will create an arc of electricity. A non-reactive gas also comes out of the gun at the same time as the wire. The gas used is 100% Argon or a mixture of CO2 and argon. The gas shields the wire as its being welded. This arc heats up the wire coming out and once cooled down the metal is now conjoined together.
Welding has been around since the 1800’s with basic processes, like the use of the oxy-acetylene torch. Then the process of arc welding came into play in the late 1800’s to the early 1900’s, when electrical welding became widely popular. Now there are many different kinds of arc welding with materials such as different electrodes, fluxes, and gases.
Many odd energy supplies are used for welding including a gas fire, an electric arc, a laser, an electron beam, friction, and ultrasound.In an industrial process, welding may be performed in many various environments, including in open
...mpositional control needed and also the reactivity of the titanium. Fatigue failure has been known to occur with nitinol because of the extreme amounts of fatigue strain that it is necessarily exposed to. This is because it is still not completely defined how durable nitinol is, so it cannot be known what to use it for as it is the best of all metals known in this case. So it is used for the highest demanding applications but in some cases it can’t handle the pressure sustained. Another use for nitinol is a temperature control system, which would work by changing shape can activate a variable resistor or switch which would control the temperature, this is a situation where it is very significant for nitinol to be a smart material otherwise this system would simply just not work. There are many others but they are not really relevant to the engineering industry.
There are number of methods to fabricate MEMS like silicon surface micromachining, silicon bulk machining, electro discharge machining, LIGA (in German, Lithographie, Galvanoformung(Electro Plating), Abformung(Injection Moulding)) .Only silicon surface micromachining is discussed here.
Abrasive Jet Machining (AJM) is the removal of material from a work piece by the application of a high speed stream of abrasive particles carried in gas medium from a nozzle. The AJM process is different from conventional sand blasting by the way that the abrasive is much finer and the process parameters and cutting action are both carefully regulated. The process is used chiefly to cut intricate shapes in hard and brittle materials which are sensitive to heat and have a tendency to chip easily. The process is also used for drilling, de-burring and cleaning operations. AJM is fundamentally free from chatter and vibration problems due to absence of physical tool. The cutting action is cool because the carrier gas itself serves as a coolant and takes away the heat.
"Welding." The Gale Encyclopedia of Science. Ed. K. Lee Lerner and Brenda Wilmoth Lerner. 4th Ed. Vol. 6. Detroit: Gale, 2008. 4682-4685. Gale Virtual Reference Library. Web. 13 Mar. 2014.http://go.galegroup.com/ps/i.do?id=GALE%7CCX2830102492&v=2.1&u=mlin_n_great&it=r&p=GVRL&sw=w&asid=67...
"Pulsed MIG Welding Improves Quality and Saves Money | Lincoln Electric." Lincolnelectric. N.p., n.d. Web. 27 Apr. 2014.
Metals possess many unique fundamental properties that make them an ideal material for use in a diverse range of applications. Many common place things know today are made from metals; bridges, utensils, vehicles of all modes of transport, contain some form of metal or metallic compound. Properties such as high tensile strength, high fracture toughness, malleability and availability are just some of the many advantages associated with metals. Metals, accompanied by their many compounds and alloys, similar properties, high and low corrosion levels, and affects, whether negative or positive, are a grand force to be reckoned with.
?Automation Reduces Weld Spatter? Welding Design & Fabrication (Jun. 2001): 37 EBSCOhost. Online. Nov. 2002 .