hmewrk_04_sol - Solution Homework #4 2.008 Design and...

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Solution Homework #4 2.008 Design and Manufacturing II Spring 2004 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 4 W/cm 2 and the weld pool size is 5 mm. c) The upgrade in b) has been very successful, and made a huge increase of the productivity in your division. If your boss considers buying you the state-of-the- art laser welding system with a hope to make a big breakthrough one more time,
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This note was uploaded on 02/23/2012 for the course MECHANICAL 2.008 taught by Professor Jung-hoonchun during the Spring '04 term at MIT.

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hmewrk_04_sol - Solution Homework #4 2.008 Design and...

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