Pulse laser synchronous riveting and welding method and device for ultra-thin plates

Abstract

The invention relates to a pulse laser synchronous riveting and welding method and a device of ultrathin plates. An upper layer of plate and a lower layer of plate are stacked and positioned on a concave mold having mold holes; a bottom mold is arranged on the concave mold; a pulse laser beam is used for acting on the upper layer of plate or an energy absorbing layer coated on the surface of the upper layer of plate to form an explosive plasma; the lower layer of plate is collided by the upper layer of plate; the upper layer of plate and the lower layer of plate generate high-strain-rate plastic flow coupling; and under the restraint of the bottom mold, the upper layer of plate and the lower layer of plate are plasticized to form rivet button shapes so as to generate mechanical interlocking for riveting. In the plastic deformation process, the pressure stress exists on the contact interfaces of the upper layer of plate and the lower layer of plate, and the high-speed sliding and the shearing deformation are generated, so that the interfaces generate the melting and the atomic diffusion, and the upper layer of plate and the lower layer of plate are welded when colliding the bottom mold. The method and the device synchronously realize the riveting and the welding of the upper layer of plate and the lower layer of plate; and joints formed by the method and the device have higher connecting strength and fatigue resistance through the compounding effect characteristic of the mechanical bonding and the metallurgic bonding.

Description

technical field [0001] The invention relates to a laser synchronous riveting and welding method and device, in particular to a method for synchronous riveting and welding of ultra-thin plates with pulsed laser and a special device for realizing the method, belonging to the field of manufacturing technology. Background technique [0002] Riveting and welding are the most common methods of joining sheets. Riveting connects materials together through plastic deformation, which belongs to mechanical connection; welding often uses heating and pressure to make atomic bonding between materials and connects together, which belongs to metallurgical connection. The traditional riveting method is a mechanical connection with rivets. This method is firmly connected, but requires pre-punching holes on the sheet, so it is difficult to ensure airtightness. Self-piercing riveting (SPR, Self-piercing riveting) is a new technology to achieve riveting by piercing the upper plate with a specia...

AI Technical Summary

Problems solved by technology

However, the sealing problem is not completely solved, and the gas can still enter the gap between the upper plate and the lower plate through the preset holes of the lower plate

In addition, the edges of the pre-drilled holes are prone to residual tensile stress and thus lead to stress corrosion

This method is a purely mechanical connection method, and the connection strength needs to be further improved.

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