Joining and Fastening Processes (Manufacturing Engineering Processes) Term Paper

Joining and Fastening Processes (Manufacturing Engineering Processes) - Term Paper Example These engineering materials in their raw form are extracted from their ores. These raw materials from ores are transformed into molten form through refining and reducing processes. The molten material is process through molds to produce commercial or industrial castings called ingots. These ingots are then processed through rolling to transform these into billets, rods and slabs suitable for marketing. These materials then undergo various manufacturing processes to obtain useful products in diverse range of sizes, shapes and forms desired by end user. According to Singh, these manufacturing processes are classified into six major categories: primary shaping processes, secondary shaping processes, metal forming processes, joining and fastening processes, surface finishing processes and processes to change characteristics and properties of materials (17). In this report, we would be focusing on joining and fastening processes required to assemble or join different parts of a product. T he process where two or more parts of the product are put together to achieve desired shape and function is called assembly, not to be confused with joining and fastening processes. In joining, different parts of the product are joined together to obtained desired function. ... A unique advantage of this process is the focus of heat in welding area ensuring less spread of heat thus reducing welding defect like warping and buckling. In addition, this concentration of heat increases the depth of welding and increases the welding speed of the process. Arc welding process consists of a heat source, shielding and a filler metal. The heat is produced through the electrical arcing between the two metals under contact (Zeilke 4). The power source is referred to as welding machine which may be electrical or mechanical. Shielding gas, fluxes or coatings are used to prevent the welding area from surroundings during the welding process. Generally, arc welding is divided into ten main types called Carbon Arc Welding, Submerged Arc Welding, Stud Arc Welding, Gas Metal Arc Welding, Electro-slag Welding, Plasma Arc Welding, Shielded Metal Arc Welding, Atomic Hydrogen Welding, Gas Tungsten Arc Welding and Electro-gas Welding. In Carbon Arc Welding, a pure graphite rod is us ed as non-consumable electrode to generate arc for producing heat. The welding can be made without or with introduction of filler metal. It can be further classified as single or twin carbon electrode welding. In Shielded Metal Arc Welding, a flux coated electrode is used to produce arc where the flux on the coated electrode fads off due to heat. In Submerged Arc Welding Process, a bare electrode is used as consumable electrode with flux feeder tube. The arc, electrode and molten pool remain submerged under granular flux to achieve homogenous welding across the structure. In Tungsten Arc Welding, a tungsten electrode as non-consumable electrode covered by shielding of an inert gas to prevent these from surroundings is used for welding.

History assignment Essay Example | Topics and Well Written Essays - 250 words - 2

History assignment - Essay Example Kennedy earned reputation after serving three years as a democratic congressional representative from the Boston area. He advocated better working conditions, more social security for the aged and higher wages. Kennedy’s outstanding performance during the four prior presidential debates contributed to his election as president of America. Kennedy’s time in office was not entirely satisfactory. Racial segregation incapacitated his tenure in office as many congresspersons refuted his efforts making it impossible to pass crucial bills that could help curb this situation. In 1964, he signed a bill that freed African-American from bondage of segregation. In addition, he faced recession as a problem that he remedied by proposing income tax cuts. The income tax cuts became actualized thereby raising minimum wage. History has positively viewed his tenure in office for championing civil rights regardless of race (Inklebarger 28). The fact is evident when he commanded the immediate release of Martin Luther, who was the champion of black people liberation. The aftermath of him leaving office was lots of tensions. The tension arose because of his closest rival Mr. Lyndon Johnson swearing in to the office at the watch of Mrs. Kennedy. The scene is perceivably a weird experience bearing in mind that the sitting president had just died and not even buried. Pertinent information, of course, would be that of his infidelity cases. Kennedy got involved sexually with a number of women like Exner, who later confesses that Kennedy’s election could not have been successful without her input. She helped him secure votes in Illinois and West Virginia. Inklebarger, Timothy. "Digitizing camelot: archive staff at the John F. Kennedy Presidential Library and Museum have been working feverishly for eight years to provide digital content for historic events leading up to the 50th anniversary of the presidents assassination in November. Now its