Special active agent for laser welding of hollow shock absorber piston rod and its preparation method and application

Abstract

The invention relates to an active agent special for laser welding of a hollow shock absorber piston rod and a manufacturing method and application of the active agent. According to the technical scheme, the active agent is composed of, by weight, 20 percent to 30 percent of La2O3, five percent to ten percent of Ce2O3, 10 percent to 20 percent of KF and the balance SiO2. A laser welding method comprises the steps that a welding seam of the shock absorber piston rod is coated with the special active agent in advance, a laser welding head reaches a work station, the welding seam of the hollow shock absorber piston rod and a solid plug is welded, and work power of a laser device is stopped in a gradual change mode when welding is finished. Through the method, under the laser low-power condition, no groove is formed, wire filling is avoided, a carbon steel pipe with the thickness of 1 mm to 10 mm is welded at high speed, a welding piece rotates, and the annular welding seam which is even in penetration and good in surface forming is formed.

Description

technical field [0001] The invention relates to a special activator for laser welding, in particular to a special activator for laser welding of a piston rod of a hollow shock absorber for a vehicle, which can realize high-speed welding without beveling and wire filling under low laser power conditions. Welding 1 ~ 10mm thick carbon steel pipe, the weldment is rotated to form a circular weld with uniform penetration and good surface shape. Background technique [0002] Automobile shock absorber is a key and indispensable component, and its product quality has a very important impact on the overall safety of the automobile. It is becoming a global trend for auto parts manufacturers to break away from complete vehicle companies and form specialized parts groups. As the international auto industry begins to implement the "global procurement" strategy of parts and components and the international multinational auto companies implement localization strategies, there will be a hu...

AI Technical Summary

Problems solved by technology

However, laser welding, especially the use of fiber lasers, has problems such as high cost and high tooling requirements, which limit wider applications.

At the same time, the boundary between the laser welding seam and the heat-affected zone is obvious, and the performance changes abruptly, which is likely to cause stress concentration and lead to premature fatigue failure of the shock absorber piston rod, which poses a serious threat to the driving safety of the vehicle

In addition, in view of the particularity of pipe welding, when laser welding is used, the heat accumulation at the tail end will easily cause problems such as weld sag and tail pits at the end of welding, which will affect the performance and appearance quality of pipe fittings

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