Laser impact welding device and laser impact welding method

Abstract

The invention discloses a laser impact welding device and a laser impact welding method, relating to the field of high speed impact welding. The laser impact welding device comprises a laser generating device, a welding device, a three-coordinate moving platform device and a control device, wherein an inverted trapezoidal step is machined at an upper-layer plate in the welding device, thus being convenient for forming an impact angle and an impact speed required by impact welding. According to the laser impact welding device and the laser impact welding method, the limitation of a conventional laser impact welding method that a certain flying distance is required to be given between an upper-layer plate and a lower-layer plate can be overcome, and the problem that the dimension of the upper-layer plate is limited by the dimension of a laser spot can be solved. In addition, the welding device is simple, the welding efficiency is high, the surface quality of a joint is high, and the welding device and the welding method are applicable to efficient and reliable connection of micro devices.

Description

technical field [0001] The invention relates to the field of high-speed impact welding, in particular to a laser impact welding device and a method thereof. Background technique [0002] Laser shock welding is a relatively new high-speed impact welding technology. The basic principle of welding is the same as that of explosive welding and magnetic pulse welding. It uses two metal plates to collide at high speed at an appropriate impact angle. When the upper plate and the lower plate When the collision angle and impact velocity exceed critical values, solid-state metallurgical bonding occurs under the action of strong plastic shear deformation at the collision interface and high temperature and pressure. The difference is that explosive welding is generally applied to large-sized flat plate welding, and there are significant defects such as large sound pollution and difficulty in realizing automation, which restrict the wide application of explosive welding technology. Elect...

AI Technical Summary

Problems solved by technology

The difference is that explosive welding is generally applied to large-sized flat plate welding, and there are significant defects such as large sound pollution and difficulty in automation, which restrict the wide application of explosive welding technology

Electromagnetic pulse welding can achieve linear and circumferential welding, and the typical welding width is at the millimeter to centimeter level. The disadvantage is that the welding material must have good electrical conductivity, which is the most important reason for limiting the development of this welding technology.

In this process, the workpiece needs to be closely bonded to the flyer with the same area through the bonding medium. If the flyer and the workpiece are not tightly bonded, the flyer and the workpiece are prone to welding, which reduces the reliability of welding.

In addition, a certain distance must be kept between the workpiece and the substrate, which will bring limitations to laser shock welding in the welding of micro devices

The patent Low-temperature laser spot impact welding without contact with the publication number US8084710 (B2) proposes a high-speed impact welding method. However, due to the spot size, the width of the upper plate material is usually less than or equal to the spot diameter, which limits the The scope of application of laser shock welding

The patent with the publication number of CN 103722291A introduces a laser shock welding device with continuously adjustable impact angle in a vacuum environment. Although the impact angle is continuously adjustable, the impact angle is constructed by the clamp to make the clamping of the upper and lower plates easier. It is cumbersome and greatly affects the efficiency of welding

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