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# H4sol - Massachusetts Institute of Technology 2.008 Design...

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Massachusetts Institute of Technology 2.008: Design and Manufacturing II Problem Set 4 Solutions Problem 4-1. Welding Speed (a) Plot welding speed as a function of weld pool depth for depths s = 1mm to 25mm at two preheat temperatures, T p = 70F and T p = 700F. Plot the two curves on the same graph [consider using a spreadsheet to do this]. Show any formulas that you derive. In order to graph the weld-pool depth versus the welding velocity, V , we use the following relationship d . 8 αJ V w = t m s 2 Choosing 1020 steel as the material and a weld tip with diameter 2 mm, the constants are α = 14 . 1 mm 2 / s and J i = . 448 T m T i . First we change the Fahrenheit temperatures to Celcius: 70 F = h fs 21 . 2 C and 700 F = 371 . 1 C. Then J 1 = ( . 448) 1500 21 . 2 = 2 . 682 and J 2 = ( . 448) 1500 371 . 1 = 2 . 047 . 247 247 160 140 120 100 80 60 40 V 20 (mm/s) 70 700 0 2 4 6 8 10 12 14 Depth of weld pool (mm) Figure 1 : Welding pool depth vs Weld Velocity (b) Explain what the point of this exercise is, ie., how does this shape how you design a part and the process that you use to make the part when welding is involved.

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H4sol - Massachusetts Institute of Technology 2.008 Design...

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