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S08 HW _7-Joining - NAME day Lab ME 240 Manufacturing...

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1 NAME____________________________ Lab day______________ ME 240 Manufacturing Homework JOINING: WELDING, BRAZING AND SOLDERING Laboratory/Lecture Review Questions (due in Lecture on 31 March) 1 What do GMAW and GTAW stand for? What is the fundamental difference between these two processes? 2 Why are “inert” gases used in these welding processes? 3 What causes distortion in welded components? How can this be controlled? 4. In what weld zone are welding failures most likely to occur? Why? 6. The amount of heat required to melt a given volume of metal depends strongly on which of the following properties? (Circle all that apply) coefficient of thermal expansion heat of fusion melting temperature modulus of elasticity thermal conductivity. 7. Which one of the following AW processes produces the highest temperatures? (a) CAW (b) PAW (c) SAW
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2 (d) TIG 8. Copper is a relatively easy metal to weld because its thermal conductivity is high: (a) true (b) false. 9. A GTAW operation is performed on stainless steel, whose unit melting energy
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