Welding Practice - The Hong Kong Polytechnic University

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The Hong Kong Polytechnic University Industrial Centre IC LEARNING SERIES Welding Practice Suitable for the following learning modules offered by the Industrial Centre: TM0212 Ducting and Welding Practice TM0402 Fabrication Processes Appreciation TM0412 Fabrication and Welding Practice TM1213 Structural Concrete and Steelwork IC2113 IC Training I (TSE) IC235 Integrated Practical Training IC253 Introduction to Product Prototyping and Fabrication Processes IC348 Appreciation of Manufacturing Processes Last updated: June 2012 Copyright reserved by Industrial Centre, The Hong Kong Polytechnic University
Welding Practice Welding Practice Objectives: To understand the basic principles of common welding technologies To be able to select and apply among different kinds of weld. 1. Introduction Welding is a permanent joining of two materials, mainly metals, through localized coalescence, resulting from a suitable combination of temperature, pressure, and metallurgical conditions. In the last fifty years, welding technology has been developed extensively and it is now the case that its use may often result in the saving of time and money when compared with some other methods of manufacturing. Today, welding is used in a wide range of applications, both in jobbing production (one off) as well as in the mass production industries. Typical applications are found in shipbuilding, the aircraft industry, civil engineering and construction, automobile manufacturing, and many consumer product manufacturing industries. With the advancement of automatic welding techniques and equipment, welding is no longer a skill-ofhand-dependent activity nor is it necessarily a costly process. Nowadays, welding equipment is often highly automated, including the increasing use of industrial robots leading to good system flexibility as to use coupled to a high degree of accuracy and quality. Developments of this kind allow welding now to be used for work with high precision requirements previously considered impossible and uneconomical. 1.1 FUNDAMENTAL PRINCIPLES OF WELDING A weld is defined as a localized coalescence of metals wherein coalescence is produced by heating the metal to suitable temperatures, with or without the application of pressure and with or without the use of any filler metal. Page 1 IC Professional Training
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Welding Practice - The Hong Kong Polytechnic University

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