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· Hardcover: 780 pages

· Publisher: DGD Press; (2009)

· Language: English

· ISBN-10: 0982087047

· ISBN-13: 978-0982087046

· Product Dimensions: 9.1 x 4.7 x 1.8 inches

 

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Physical Chemistry of Fusion Welding (Hardcover)

German F. Deyev, Dmitriy G. Deyev

Product  Description              

                                                                                             

The fusion welding is the main technological process applied in the production of weldments.

It's known, that depending on the kind of the applied heat source, the following fusion welding processes are distinguished: electric arc, electron beam, laser beam, electroslag, light beam, and gas welding. However, irrespective of the applied welding procedure, the main goal of any process is producing a sound welded joint. This is only possible with a sufficiently comprehensive allowance for the physicochemical processes proceeding.

Presenting the latest research on the topic, Physical Chemistry of Fusion Welding is a cutting edge and comprehensive book. The book contains modern representations by physicochemical processes, that occur on the borders of contacting phases: solid liquid metals, metal slag, metal gas, metal slag gas and the structure and properties of its phases: solid and melt metals, slags, and gases. In the book established the role of physicochemical processes in the formation of the weld and deposited metal; the formation of defects of the welding joints (solidification, liquation, polygonization, and cold cracks, non-metallic inclusions, pores, undercuts, lack of penetration, and etc.).

The possible advancement of welding materials and technologies of welding and surfacing on the bases of prior research are also shown.

Physical Chemistry of Fusion Welding presents this knowledge in a thorough and accessible manner, making it the ideal text for practical and scientific specialists in the fields of welding and metallurgy.

 

Review

 

Fusion welding currently is the main technology applied in fabrication of the most diverse structures. Fusion welding is used to joint practically all metals and alloys of similar and dissimilar materials of any thickness. When fusion welding is applied, the parts are joined either as a result of melting of the edges of parts being welded, or as a result of simultaneous melting of the base and additional (electrode) metal. In either case the metal melt forms a weld pool, the subsequent solidification of which, proceeding without external pressure application, leads to the formation of the weld.

Depending on the kind of the applied heat source, a distinction is made between the following fusion welding processes: electric arc, electron beam, electroslag, laser, light beam, and gas welding. However, irrespective of the actual welding process applied, the main aim of any process is producing a sound welded joint. This is only possible if a sufficiently comprehensive allowance is made for the main physicochemical processes proceeding in the welding zone.

Heating, melting, evaporation, solidification and subsequent cooling of solid metal, the transition of a substance from one phase into another, initiation of new phases, substance distribution inside a phase, interaction of the contacting phases all these and many other processes are characteristic of fusion welding to varying degrees. Since all or part or of the above processes proceed simultaneously in different regions of the weld pool and welded joint, and their occurrence and progress is determined by a large number of factors, studying the process as a whole is a real challenge. There is no doubt, however, that all of these processes are determined by physicochemical processes proceeding on the interfaces of the contacting phases and in their bulk.

For instance, formation of various defects (pores, non-metallic inclusions, lacks-of-penetration, solidification cracks, etc.), composition and structure of the weld and heat-affected zone metal, hydrodynamic processes in the weld pool, formation of deposited metal and weld root, electrode-metal transfer and other processes are related to the physical and chemical processes running during welding. In view of the features characteristic for fusion welding (high temperatures, small volumes of contacting phases, considerable contact surfaces, etc.), these processes differ in many ways from the physicochemical processes running in metal production, and may have a noticeable influence on the service properties of the welded joint and deposited metal. Therefore, in development of the technologies of welding and surfacing it is necessary to know these processes and take them into account, as this is the only way to produce a sound welded joint. --Editorial Review