What are the advantages and disadvantages of riveting, bolting and welding?

From the point of view of bearing capacity, riveting has better shear capacity and worse tensile capacity. It can be connected by stretching or shearing. Welding can be done under tension and shear, but it is afraid of tearing. From a detachable point of view, riveting is a detachable link, but riveting and welding are not. From the point of view of quality assurance, it is the most difficult to check the quality of riveting welding, so welding is rarely used in civil aviation aircraft. In changing the material properties of parts, welding has the greatest influence, and the residual stress and deformation are serious, which is acceptable for bridges and automobiles, but not ideal for the aerodynamic shape of aircraft surfaces. From the cost point of view, threaded connection is higher than riveting and welding. From the point of view of increasing excess weight, threaded connection is higher than riveting and welding. For the connection of dissimilar materials (such as aluminum and titanium, composite materials and titanium, different series of aluminum alloys), welding is not feasible (different materials are often connected on airplanes, which seriously affects the application scope of welding). From the above comparison, we can know why cars and bridges are more connected by welding and screwing, while passenger planes are more connected by riveting and screwing.