SU610590A1 - Method of manufacturing laminated welded vessels - Google Patents

Description

one

The invention relates to the field of machine building and can be used for the designation of multilayer high pressure vessels (Yu and more) .5

A known method of manufacturing high-pressure welded vessels, including sequential welding of all layers of the vessel, filling the vessel with high-pressure working gas, exceeding the working one, and testing the tightness of the vessel l "

The disadvantages of this method are the increased danger of checking the quality of a high-pressure vessel, the laboriousness of filling a vessel with a high-pressure gas; 18 increased consumption of materials to ensure the strength of the vessel, since it must hold a test pressure greater than the working pressure.

Closest to the proposed one is a method of making multi-layer welded high-pressure vessels, including the successive welding of layers in filling a vessel with an overpressure test gas. It is used to check the tightness of the vessel 2. J 25

However, this method does not fully guarantee the reliability of monitoring the tightness of vessels, since it is not uncommon for welding subsequent layers after the first layer that the tightness of the inner layer of the inner layer is impaired due to its burning through. In this case, the entire vessel remains tight if tight: one of the subsequent layers; and when checking a vessel, the working gas through the hole formed from the burn-through penetrates between the layers of the vessel, i.e. The first layer, in which the burn-through occurred, does not perceive the pressure of the working gas and thereby decreases the strength of the vessel.

The purpose of the invention is to increase the reliability of monitoring vessel tightness.

For this, the proposed method fills the vessel; the test gas is carried out after welding the first layer, and the gas overpressure in the vessel is maintained until the welding of all subsequent layers

The advantage of the proposed noca tea operation is that the test gas is used at an overpressure of 1-5 atm. find out

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Claims (2)

including the tightness of the first inner layer in the event of a burn-through, directly at the time of the formation of a burn-through during welding of any subsequent layer, since leakage occurs through the burn-through hole, as a result, the quality of multi-layer high-pressure welded vessels improves as possible burn-throughs are detected first-, the inner layer. The method is carried out as follows. Each layer of the vessel is made of steel with a thickness of 3-5 mm, all layers are welded under vacuum in an electron-beam / installation. Firstly, the first internal cnoi is welded, then the vessel is filled with test gas, for example helium, under excess pressure of 1 MPa and immediately after this, the second and third layers are welded successively, while the gels in the vessel are overpressure. In the case of the first burnout, welding of the second and third layers breaks its tightness and the skull of the hole that is formed, the gels leak, which can be determined by various methods: by the pressure drop of the gels inside the vessel, by the formation of a crater of liquid metal at the burn-through point, vacuum in an electron beam installation, helium leak detector, or other method. In the manufacture of a three-layer welded vessel working under pressure of gases up to IPOO ATI, the inner corrosion-resistant layer is made of stainless steel 12X18H1OT with a thickness of 1.5 mm, and subsequent layers of high-strength steel X15N5D2PG with a thickness of 2-4 mm. The components of the internal block are installed in the required position and the joints are welded with an electron beam in a vacuum in the electron beam: installation. The welded inner layer of the vessel is filled with helium under an excess pressure of 0.1-5 bar, the welded layer is checked for airtightness. For example, using a standard helium leak detector. Components of the next layer are installed, joints between components of this layer are welded, cox-f is wound overpressure in the inner layer, for example, using a spool valve installed in the gas supply of the vessel. Assembly and welding of joints of components of the subsequent layer is repeated, keeping pressure in the inner layer. This method ensures reliable detection of the burn-through of the first inner layer of the vessel when welding any of the subsequent layers. The invention The method of manufacturing multi-welded. high pressure vessels, inclusive welding of layers and filling of the vessel with test gas under overpressure to check the tightness of the vessel, characterized in that, c) increasing the reliability of monitoring the tightness of the vessel, filling the latter. with a dry gas after the welding of the first layer, and the excess replenishment of the reptile in the vessel is maintained until all the welding is completed. subsequent layers. Sources of information taken into consideration at examination: 1. Author's certificate CCCf № 188О94, cl. G-O1 M 3/30, 1965. 2.Taran V.D. Technology of welding and installation of pipelines and tanks. ML, Gostoptekhizdat, 1953, p. 304-305,