420_Topic5_prm_joints - MECH 420 Permanent Fasteners Slide...

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Unformatted text preview: MECH 420 Permanent Fasteners Slide 1 Welding, bonding, and the design of permanent joints Introduction file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 2 Introduction file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 2 History file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 3 Iron pillar of Delhi Aside: electric arc MECH 420 Permanent Fasteners Slide 4 Electric arc : an electric arc is an electrical breakdown of a gas which produces an ongoing plasma discharge, resulting from a current flowing through normally nonconductive media such as air. A synonym is arc discharge. Arc Welding file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 5 Gas metal arc welding file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 6 Gas tungsten arc welding file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 7 Gas welding file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 8 Resistance welding file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 9 Unusual conditions file://localhost/Users/D/Desktop/Welding.html MECH 420 Permanent Fasteners Slide 10 Common joining techniques MECH 420 Permanent Fasteners Slide 11 Square butt joint Single V joint Lap joint T joint Arc and gas-weld symbols MECH 420 Permanent Fasteners Slide 12 Welding symbols • Welds are precisely specified on working drawings, using welding symbols as standardized by the American Welding Society (AWS). MECH 420 Permanent Fasteners Slide 13 Welding symbols • The welding symbol consists of some (or all) of these: – Reference line – Arrow that points to weld – Basic weld symbol – Dimensions – Other symbols – Finish symbols – Tail – Specification or process MECH 420 Permanent Fasteners Slide 14 MECH 420 Permanent Fasteners Slide 15 Welding symbols Fillet welds MECH 420 Permanent Fasteners Slide 16 • Fillet weld : A type of weld that is triangular in shape and joins two surfaces at right angles to each other in a lap joint, T-joint, or corner joint. Fillet welds are the most common types of welds. Common types of welds MECH 420 Permanent Fasteners Slide 17 Plug & slot welds MECH 420 Permanent Fasteners Slide 18 • Plug weld : A type of weld made by joining one metal part with a circular hole to another metal part positioned directly beneath it. Some definitions http://www.toolingu.com/definition-650130-11860-plug-weld.html • Groove weld : A type of weld that consists of an opening between two part surfaces, which provides space to contain weld metal. Groove welds are used on all joints except lap joints....
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This note was uploaded on 02/07/2011 for the course MECH 420 taught by Professor M.s during the Fall '09 term at American University of Beirut.

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420_Topic5_prm_joints - MECH 420 Permanent Fasteners Slide...

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