Old Test 2: 1. A filler rod is commonly used with shielded metal arc welding. 2. Chemical Etching: Pros: thin sheet, mass production Cons: undercut, slow, possible toxic chemical 3. Choose best weld bead: A- Uniform bead and good penetration 4. The strain hardening component of lead is practically 0 at 200C, then:- Its tensile strength is the same as strength coefficient and its flow stress is the same as the yield strength 5. Comment on the weld quality of 1045 and 1010 steels when welded with shielded metal arc process- the weld on 1010 steel will have less chance for crack and be stronger 6. An undercut is often associated with:- Chemical etching Homework: 13.17: The part dimension for a certain injection molded part made of polycarbonate is specified at 3.75in. Compute the corresponding dimension to which the mold cavity should be machined, using the value of shrinkage given in the table. 13.19:An injection molded, polyethylene part has a dimension of 2.5 in. A new material, polycarbonate, is used in the same mold. What is the expected corresponding dimension of the polycarbonate molding? 13.21: A blow molding operation produces a 6.25 in diameter bottle from a parison that is extruded in a die whose outer diameter=1.25 in and inside diameter= 1 in. The observed diameter swell ratio=1.24. What is the maximum air pressure that can be used if the maximum allowable tensile stress for the polymer is 1000lb/in
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