Aluminum alloy non-penetration laser welding strengthening platform and method

Abstract

The invention discloses an aluminum alloy non-penetration laser welding strengthening platform and method. A first mechanical arm and a second mechanical arm are respectively provided with a first laser head and a second laser head; a processing chamber is respectively connected with a water inlet pipe and a water outlet pipe; welding plates in butt joint are clamped and positioned by fixtures inthe processing chamber; the water inlet pipe is connected with a water pump; an amplitude change rod is fixed on the inner wall of the processing chamber; a working head of the amplitude change rod ispositioned under a preset water level upper limit; a blind way is formed in the center of the butt joint end surfaces of the welding plates before welding, so that the flowing-down speed of molten metal on the front wall of a key hole during welding is effectively lowered, and the burnthrough of the back parts of the welding lines or the formation of full-penetration welding is prevented; and thelaser impact processing is performed after welding to effectively refine grains on the surface layer of an aluminum alloy layer welding joint, so that the mechanical performance of the joint is improved. In addition, the laser welding and the laser impact technology are fused on one platform, and the laser impact processing is performed after the welding operation, so that the secondary positioning and clamping of workpieces are prevented, and the production efficiency and the automation level are improved.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a platform and method for aluminum alloy non-penetration laser welding strengthening. Background technique [0002] Laser welding technology is widely used in rail vehicle manufacturing, aerospace parts manufacturing and other industries due to its advantages of high power density, small heat-affected zone, and large weld depth-to-width ratio. my country's railway vehicles are at the forefront of the world and have become a major export product of my country. At present, my country's railway transportation is still unremittingly combining the requirements of users and strictly controlling raw materials and manufacturing processes. In order to continuously increase the speed of high-speed trains, an effective way is to reduce weight. Aluminum alloy profiles are widely used in railway vehicle manufacturing and many other fields because of their low density, good corrosion resista...

AI Technical Summary

Problems solved by technology

Compared with full-penetration laser welding, non-penetration laser welding of aluminum alloys is more sensitive to changes in welding parameters, and slight changes in process parameters can easily lead to defects such as unbonded joints and back burn-through

[0004] The search found that placing the welding plate on a workbench with cooling water as described in the patent "A Device for Incomplete Laser Welding" (Application No.: 201520134200.6) can effectively improve the safety of the middle and lower layers of non-penetration welding. The problem of thermal deformation, but it has no effect on the oxidation and discoloration of the back of the lower plate

The patent "A Method for Welding with Non-Penetration Laser Welding Equipment" (Application No.: 201410242022.9) states that by setting an infrared temperature sensing system on the back of the weld to capture the back temperature in real time, it can be adjusted in real time. It is more difficult to set up the follow-up device for the sensor on the back of the welding plate, and the process and device are more complicated

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