Welding process for metal filter elements

Abstract

The invention provides a welding process for metal filter elements. A domestic quantitative purpose can be satisfied, the quality of the welding process is stable, the qualified rate is high (can reach more than 95%), and the production cost is low. The specific solution scheme is that the welding process comprises the following steps: (1) cutting and blanking sintered meshes or sintered felt meridians to roll; (2) welding via vacuum electron beams to form a filter cartridge; (3) rolling and straightening the filter cartridge for many times; (4) welding a filter element joint which is processed well and the filter cartridge via the vacuum electron beams. In the welding process, filter materials and micro joints are effectively protected due to the protection of vacuum state; the welding penetration errors of the electron beams are small, welding seams are narrow, rejection rate is reduced, and domestic quantitative production is realized on the premise of satisfying stable quality, high qualified rate and low production cost.

Description

technical field [0001] The invention relates to welding processes of various small and micro filter cores, in particular to a welding process for metal filter elements with a diameter of less than 10mm. Background technique [0002] At present, all kinds of micro servo valves and filter elements for aerospace micro valves basically rely on imports. The quality of imported products is stable and the appearance is beautiful, but the price is high. Some domestic manufacturers have small-scale production, but the production technology is generally backward, and the production scrap rate Very high, time-consuming, difficult to achieve mass production, and the product quality is unstable, accidents occur from time to time, causing the customer market to prefer imported products to ensure the stable operation of the equipment; there are many kinds of metal filter materials, including stainless steel woven mesh The most representative, it uses its own micropores to intercept impurit...

AI Technical Summary

Problems solved by technology

[0002] At present, all kinds of micro servo valves and filter elements for aerospace micro valves basically rely on imports. The quality of imported products is stable and the appearance is beautiful, but the price is high. Some domestic manufacturers have small-scale production, but the production technology is generally backward, and the production scrap rate Extremely high, time-consuming, difficult to achieve mass production, and the product quality is unstable, accidents occur from time to time, causing the customer market to prefer imported products to ensure the stable operation of the equipment; there are many kinds of metal filter materials, including stainless steel woven mesh The most representative, it uses its own micropores to intercept impurity particles and play a filtering role. The stainless steel mesh is made of drawn stainless steel wire and woven by weaving equipment. Because it is a mesh material, the wire is fine and the thickness is thin. , It is very difficult to weld, and the strength and rigidity of a single layer of stainless steel mesh are relatively poor. If several layers of metal mesh are superimposed and sintered into a porous material like a steel plate, the strength, rigidity and processability will be solved. A multi-layer metal sintered mesh is produced, which are two typical stainless steel filter materials. When used for filtration and separation, they need to be welded into filter elements. The usual method is welding by traditional methods such as argon arc welding, but there are many disadvantages: 1. High-mesh single-layer mesh and tiny filter elements cannot be welded. 2. The sintered mesh has insufficient penetration and strength. 3. The weld seam is wide and the weld seam is not beautiful, resulting in a reduction in the filtration area. 4. Severe oxidation during welding

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