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hmewrk_04_04

# hmewrk_04_04 - Homework#4 2.008 Design and Manufacturing II...

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Homework #4 2.008 Design and Manufacturing II Spring 2004 Out: March 10 th Due: March 15 th Note: this is due coming Monday. Problem 1: The purpose of this problem is to have you understand the effect of heat intensity of various welding heat sources on the interaction time and the feed rate. For a planar heat source on steel, the interaction time, t m , was given at the lecture as below. H.I. is the heat intensity, in W/cm 2 . You are supposed to weld a straight lap joint with a length of 40 cm. t m = (5000/H.I.) 2 a) You have manual oxyacetylene welding equipment, which has a weld pool size of 10 mm. How long will it take to finish the job? Assume the H.I of an oxyacetylene welding source is 10 3 W/cm 2 . b) If your boss buys you new SMAW (shielded Metal Arc Welding) equipment, which is 3 times more expensive than the oxyacetylene equipment, how long will it take to finish the same job? Will it justify the purchase of the SMAW tool? Assume that SMAW has H.I of 10

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hmewrk_04_04 - Homework#4 2.008 Design and Manufacturing II...

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