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Welding-Guide - 40083 CigWeld_PocketGuide 1:30 AM Page 213...

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TECHNICAL AND TRADE INFORMATION TECHNICAL AND TRADE INFORMATION 213 Email: [email protected] GP 6 Notice about the Technical Information and Copyright in this section. CIGWELD Pty. Ltd. A.B.N. 56 007 226 815 authorise the use of the following CIGWELD printed material to be used as an aid in educational training and teaching. This authority recognises that this printed material may be reproduced by printing or other means, electronic or otherwise in whole or in part for educational purposes only. When reproduced material is printed or copied in whole or in part CIGWELD require that the original document from which this material was reproduced to be named in credits or references. Where material is reproduced in part every effort shall be made to ensure that the extract is not misleading and that all associated safety information is included. CIGWELD does not authorise the reproduction of this material, electronic or otherwise, for sale or commercial use by competitors or other like companies. The use of CIGWELD printed material, reproduced in print or other forms for commercial use, may be subject to the payment of a royalty. Technical and Trade Information... 213 12.1 Terms & Definitions... 215 12.2 Basic types of welded joints... 219 12.3 Welding Positions & Symbols... 223 12.4 Defects in welding... 229 12.5 Distortion, causes & control... 235 12.6 Safety in Welding... 240 12.7 Consumables Classification Tables... 244 12.8 Shielding Gas Information... 259 12.9 Welding Guide... 266 12.9.1 Welding of Steel... 266 12.9.2 Welding of Stainless Steel... 290 12.9.3 Welding of Aluminium... 300 12.9.4 Welding of Cast Iron... 328 12.9.5 Welding of Copper & Copper Alloys... 337 12.9.6 Welding of Dissimilar Metals... 348 12.10 Hardfacing Information... 350 12.11 Deposition Data... 372 12.12 Technical Facts & Figures... 379
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TECHNICAL AND TRADE INFORMATION EXPLANATION OF TERMS RELATING TO . . . 214 Email: [email protected] MECHANICAL PROPERTIES OF WELD METAL The mechanical properties of a metal describe its suitability for any given application and provide a performance forecast. Mechanical properties are of the utmost concern in welding consumable qualification since weld deposits must often provide service characteristics equal to or better than those of the base metal. The properties considered most often (and those that are frequently cited in Welding Consumable Specification requirements) are Strength, Hardness, Ductility and Impact Resistance. 1. Strength: A metal’s “strength” is its capacity to withstand external forces without breaking. In a tension test, under stretch loading, a specimen reveals several features - including elastic limit, elongation, yield point, yield strength, tensile strength and reduction in area. During the test, load is increased gradually and the specimen stretches in direct proportion to the load until it reaches its Yield Poin t. At any point up to the yield point, if the load is relaxed, the specimen will return to its original dimensions.
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