CH 9 - CH 9: Design of Permanent Joints This chapter...

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Shigley’s Mechanical Engineering Design, 8 th Ed. Class Notes by: Dr. Ala Hijazi CH 9 Page 1 of 6 CH 9: Design of Permanent Joints This chapter introduces permanent joining methods which include: welding, soldering, cementing, bonding, etc. Permanent joining usually leads to significant savings over non-permanent joining ( because of the elimination of fasteners and holes ). Welding Symbols Welding symbols are used on drawings to indicate the type and specifications of the weldments. Figure 9-1 shows the American Welding Society ( AWS ) standard welding symbol. The most important features of the welding symbol are illustrated below: The table below shows the Basic weld symbol for the different types of welds. Figures 9-3, 4, 5 show some examples for the use of welding symbols. In general there are two types of welds, butt welds and fillet welds. - Fillet welds are the most used type for machine elements. - Butt welds are usually used for pressure vessels.
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Shigley’s Mechanical Engineering Design, 8 th Ed. Class Notes by: Dr. Ala Hijazi CH 9 Page 2 of 6 Since welding is associated with a significant increase in temperature , there will be some metallurgical changes in the parent material in the vicinity of the weldments. h Thus, when checking for failure of the parent material in the vicinity of the weldments, it is recommended to use the properties of Hot-Rolled ( HR ) material even if the material is Cold-Drawn ( CD ). Also, residual stresses might be introduced during welding because of clamping or sometimes because of the order of welding. Butt and Fillet Welds For a Butt weld subjected to tensile force or shear force; s The normal stress is found as: ߪ ൌ ܨ ݄݈ Where ݄ : Throat of the weld ( Does not include the reinforcement ) ݈ : Length of the weld s The average shear stress is found as: ߬ ൌ ܨ ݄݈ h The reinforcement produces a stress concentration , and therefore it should be removed by grinding or machining if the joint is subjected to fatigue
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This note was uploaded on 10/25/2010 for the course MECHINCAL 2010 taught by Professor علاءحجازي during the Spring '10 term at Hashemite University.

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CH 9 - CH 9: Design of Permanent Joints This chapter...

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