Joint riveted

Cold or Hot Heading. Rivets or studs can be used in forming permanent mechanical joints. The heading is made with special tools and preferably with the rivet at elevated temperatures. Eormed heads tend to recover part of their original shape if exposed to elevated temperatures, resulting in loose joints. Forming at elevated temperature reduces recovery. 

Transition Joints. Use of explosion-clad transition joints avoids the limitations involved in joining two incompatible materials by bolting or riveting. Many transition joints can be cut from a single large-area flat-plate clad and deflvered to limit the temperature at the bond interface so as to avoid undesirable diffusion. Conventional welding practices may be used for both similar metal welds. 

Explosion-welded constmction has equivalent or better properties than the more compHcated riveted systems. Peripheral benefits include weight savings and perfect electrical grounding. In addition to lower initial installation costs, the welded system requires tittle or no maintenance and, therefore minimizes life-cycle costs. Applications of stmctural transition joints include aluminum superstmctures that are welded to decks of naval vessels and commercial ships as illustrated in Figure 11. 

As discussed in Section 29.2.5, jointing of two different metals (copper being one) causes electrolysis at the joints, leading to corrosion and failure of the joint. To avoid this, it is recommended that the same procedure be adopted as discussed in Section 29.2, and where the electrode and the connecting ground strip are of the same metal, that the joints are riveted or welded with the same metal after making the surface. Soldering is not recommended. 

For tanks and vessels, welded units are preferred over riveted or bolted designs. Fastener joints provide sites for crevice corrosion. Undrainable horizontal flat tops of tanks should be avoided unless proper drainage schemes are included in the design. Tank bottoms should be sloped toward... 

Furnace-type air heaters are manufactured from cast iron or steel, and cased in brickwork or steel. The cast-iron heaters are sectional, cemented and bolted together. The steel type are welded or riveted. It is essential that the joints are airtight, so that the cold air can pass over the heated surfaces of the furnace and flues without contamination by the flue gases. 

L J. Hart-Smith, Design and Empirical Analysis of Bolted or Riveted Joints, In Joining Fibre-Reinforced Plastics, F, L. Mathews (Editor), Elsevier Applied Science, London and New York, 1987, pp. 227-269. 

Nietung, f. riveting riveted joint. Nietverbindung,/. riveted joint. 

Welded butt joints should be used instead of bolted or riveted ones. 

The geometry of the structure, e.g. riveted plates, welded fabrications, threaded joints. 

Joining Tantalum can be joined by riveting, brazing and welding however, due to the good properties of welded joints the former techniques are seldom used. 

While ideally structures should be designed and fabricated so that environment-sensitive cracking is avoided, in practice it is sometimes necessary to live with the problem. This implies an ability to detect and measure the size of cracks before they reach the critical size that may result in catastrophic failure. Such inspection has important implications for plant design, which should be such as to allow inspection at relevant locations. The latter are regions of high residual stress (welded, bolted or riveted joints) and regions of geometrical discontinuity (notches, crevices, etc.) where stress or environment concentration may occur. 

Finally, mechanical joints, e.g. nuts, bolts, rivets etc., are still important joining methods for which attention must be given to compatibility to avoid dissimilar metal corrosion problems and crevice corrosion " . ... 

Countersunk rivets or screws give a surface profile which is compatible with painting protuding bolts and rivets are very much more difficult to coat adequately. Welded joints can aid optimum shaping for painting. Butt joints are preferable to lap joints. 

River water quality studies, 26 32 River water, silicones in, 22 602 Riveting, of magnesium joints, 15 367-368 RN 222Rn, 25 392 RNA, 2 554... 

USP 2410047 (1946) (Various expl rivets and other explosively blasting joints) 8)F.F.Huston et al, USP 2412886 and 2412887 (1945) (Application of the principle of expl rivets in the construction of locomotive boilers. It is claimed that completely fluid-tight joints may be produced by expanding the ends of stay bolts thru the use of expl chges) 9)L.A.Burrows W.E. 

Bonding enables stresses to be distributed over large areas in the joint, thus avoiding the local stress concentrations present in riveted or spot-welded joints which can reduce fatigue resistance. 

Bonding can eliminate crevices that often lead to crevice corrosion in riveted joints. 

A table of polycrystalline diamond may be manufactured and later attached to a prosthetic joint in a location such that it will form a bearing surface. The attachment could be performed by welding, brazing, or by the use of fasteners such as screws, bolts, or rivets (17). 

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