Metallurgy

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

By J. Hicks (Auth.)

A pragmatic 'how to do it' booklet 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 data the dressmaker may still provide to the welding engineer or fabrication superintendent in order that the designer's goals could be completed, by way of engineering functionality, defense, reliability, price and visual appeal

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Of these, many have picked up knowledge secondhand or by hearsay. Some of it is out of date whilst some can be quite incorrect. The following table compares some of the myths of welding with the correct information. 60 Hearsay Correct information Welds should not be used in tension Welds can be made as strong as required which is usually as strong as the metal being joined Mild steel cannot be Most combinations of metals can be welded together provided that their melting points are welded to high not too different tensile steel C 0 2 welding always The quality of a weld depends on the establishgives lack of sidewall ment of a sound welding procedure and fusion adherence to it in production, with properly maintained equipment Welders are awkward people Manual welding is an unusual skill often performed in unusually uncomfortable conditions.

40). 39 Tensile test specimen. If the steel itself has to have these properties, then it is essential that the welded joints also behave in the same way, otherwise the joints will represent weak points in the design. Weld metals designed to have properties equal to the parent metal are said to 'match' the parent metal. 45 40 Rolling steel plate to form a cylinder. Notch toughness Another welded joint property which is sometimes required to match that of the parent metal is notch toughness. This is a measure of the steel's resistance to brittle fracture.

Notch toughness Another welded joint property which is sometimes required to match that of the parent metal is notch toughness. This is a measure of the steel's resistance to brittle fracture. There are a number of different types of tests which are used to measure this property although this subject will not be dealt with in this book. The reader is referred to a book by K G Richards ('Brittle fracture of welded structures', The Welding Institute, 1971 ). In high temperature applications, the creep strength of the weld metal is important but again that is a specialised matter which can be studied in other books.

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