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Dt1410 Unit 1 Assignment 2

Unit 6 Lab 1: Case Problem Solutions Chapter 8 Case Study 2: Case 1. Welding Thin Material A new business begins to manufacture patio furniture made from thin-wall steel tubing. Shielded-metal arc welding is initially employed, but metal burn-through occurs immediately. The production supervisor, an experienced welder, recommends that shielded-metal arc welding be replaced with TIG. The vice president of manufacturing suggests that this would be expensive and the problem could just as easily be solved by further training of the production welders to improve their welding skills. In your opinion, who is right, and what would you recommend in this case? Suggested Solution: The MIG process is the best process for this application. The resulting welds will be clean with no slag and other inclusions such as would remain in the rod arc process. This will make the product much easier to clean prior to painting, and the weld quality will be excellent. It may be necessary to purge the inside of the tube with the shield gas to further prevent any burn-through during the fabrication process. Production rates can be maintained at a high level using the MIG process. Grading Rubric Use the following grading rubric to measure whether students met required paper criteria: Category Grade Weight Comments Formatting, Spelling, and Grammar 35% Students followed the prescribed assignment format:  Two full pages (double-spaced)  Font: Times New Roman (12 point)  Accurate spelling and grammar  Formatting includes required components. Research 25% Students adequately researched their solution to the case problem and identified appropriate sources they used to make their decisions. Content 40% Students applied content knowledge to make a good decision,

12. Space-age metals such as titanium are extracted by complex processes. What is the major energy source  for these processes: coal, coke, petroleum, oil or electricity? Electricity is the major energy source. 13. As you consider what you’ve learned about extracting metals from their ores, read the first two paragraphs  of the section titled METAL CORROSION in Chapter 18. What is the relationship between that information and  what you’ve just learned? The relationship is that refined metals require necessary steps in their processing to prevent them from  reverting back to their natural states. Iron for example, exists in nature chemically combined with oxygen. Refining separates the metallic iron from  the oxygen. However, if iron is used in the presence of oxygen, it will most like revert back to its natural state-iron oxide. Chapter 5  Questions 1-14 1. From what raw materials are plastics derived? Coal, water, limestone, sulfur, salt and petroleum are the raw materials. 2.  What is the source of natural rubber? The source is the rubber tree. More to the point, the natural gum contained inside the rubber tree. 3.  What polymer derived from acetylene gas is called polychloroprene (neoprene)? Chloroprene is the polymer. 4.  From what basic source of raw material do we get most of our pesticides, fertilizers, clothing fibres and  many medicines such as antibiotics? Petrochemicals. 5.  What is the major difference between thermosetting and thermoplastic materials? Thermosetting materials achieve their highest strength and hardness through heating. If heated again, they do  not soften. Thermoplastic materials gain their strength through cooling. 6.  Which type of material, thermosetting or thermoplastic, can be easily injected by pressure into a mold? Thermoplastic. 7.  If you need a plastic material for a product that must resist a variety of chemicals and the effects of sunlight, have a nonstick surface, and withstand high temperatures such as would be found in a baking oven, what  would you choose: d) Fluorocarbon Plastics 8.  Name two items in which glass-reinforced nylon 6/6 can replace metal where considerable loading is 

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