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Read e-book online A Guide to Designing Welds PDF

By J. Hicks (Auth.)

ISBN-10: 1855730030

ISBN-13: 9781855730038

A realistic 'how to do it' ebook written with the layout and welding interface in brain. It informs designers not just of what they need to find out about welding but additionally, and most significantly, units out the knowledge the clothier should still supply to the welding engineer or fabrication superintendent in order that the designer's goals will be accomplished, by way of engineering functionality, security, reliability, fee and visual appeal

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For flow of solids or liquids, or be architecturally unsatisfactory. 44 CHAPTER 8 Engineering properties of welds Strength The most common property required of any load bearing item is strength. In steels this may be the yield strength or the ultimate strength and these quantities are measured as stresses in tensile tests. 39). Of particular importance is the amount by which the steel stretches plastically between the yield strength and the tensile strength. This plastic behaviour is a particular feature of mild and high yield steels and accounts for their ability to be used in structures based on the plastic theory of design.

Nonetheless, designers should appreciate that the more accessible a welded joint, the more likely it is to be of good quality, and, of equal importance, accessible for inspection and, if necessary, repair. The last point is of some importance for if a defective weld is found on inspection it will have to be taken out and remade, a procedure which may not lend itself to robotics. Naturally, there are methods of reaching points of limited access which are used when the situation demands it but the cost can be astronomical especially if the product is already in service.

The techniques commonly used for surface breaking and buried defects are listed below. Surface breaking defects Visual examination — this is not usually included in definitions of NDT but is vital in assessing not only the appearance of welds but that all the welds on a drawing have been completed. Magnetic particle — to conduct this test, the weld area is magnetised and iron powder, dry or in liquid suspension, is sprayed on. 46). g. stainless steels or aluminium. Strong dye is sprayed on the joint and soaks into cracks, etc.

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A Guide to Designing Welds by J. Hicks (Auth.)

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