Welding process of heat-resistant steel cylindrical housing

A welding process, heat-resistant steel technology, applied in the direction of welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of welding deformation and welding efficiency, and achieve the effect of solving welding deformation, good quality, and shortening the welding cycle

Inactive Publication Date: 2012-05-23
SHENYANG BLOWER WORKS GROUP CORP +1
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a welding process for chrome-molybdenum (20CrMo) heat-resistant steel cylinder casing, which solves the problems of welding deformation and welding efficiency, by selecting MAG gas with similar chemical composition and strength matching with the welding casing material Welding materials for shielded welding, which can ensure the strength of the weld seam

Method used

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  • Welding process of heat-resistant steel cylindrical housing
  • Welding process of heat-resistant steel cylindrical housing
  • Welding process of heat-resistant steel cylindrical housing

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Embodiment Construction

[0034] The present invention is described in further detail below in conjunction with the example of implementation.

[0035] 1. Structural Design of Cylindrical Case

[0036] The cylindrical casing of the compressor is composed of cylinder body 1, inlet flange 2, outlet flange 3, outrigger 4 and guide key 5, wherein inlet flange 2, outlet flange 3, outrigger 4 and guide key 5 are respectively Welded on cylinder 1, such as Figure 1~5 shown.

[0037] 2. Chemical composition, heat treatment and mechanical properties of steel and welding consumables

[0038] The chemical composition and mechanical properties of 20CrMo steel are shown in Table 1 and Table 2.

[0039]

[0040]

[0041] The chemical composition of the welding wire and the mechanical properties of the cladding metal are shown in Table 3 and Table 4.

[0042]

[0043]

[0044] 3. Welding characteristics of 20CrMo heat-resistant steel

[0045] 20CrMo steel is a low-alloy pearlitic heat-resistant ste...

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Abstract

The invention relates to a welding technology in an equipment manufacturing industry, discloses a welding professional technology for welding a housing of a BCL cylindrical centrifugal compressor and specifically relates to a welding process of the cylindrical housing of the centrifugal compressor made of chrome molybdenum heat-resistant steel 20CrMo material. Gas shielded welding is adopted, and the adopted welding wire trade name is CHW-55B2; the diameter of welding wires is phi 1.2mm; the polarity of a power supply is direct current electrode positive; and the welding process comprises pre-welding treatment, welding process and post-welding treatment, wherein the process parameters of the welding process are as follows: welding current is 150-230A, welding voltage is 25-30V, shielding gas is mixed gas comprising 80% by volume of Ar and 20% by volume of CO2, welding speed is 100-200mm / min, dry extension is 10-15mm and gas flow rate is 15-20L / min. According to the welding process provided by the invention, the welding wires can be fed automatically during the welding process and a welding rod does not need to be changed; and as heat is centralized in the gas shielded welding of an MAG (metal active gas) consumable electrode, the welding process has the advantages of narrow heat affected zone, small deformation, aesthetic shape, good quality, fast welding speed, high welding efficiency and the like.

Description

technical field [0001] The invention relates to the welding process in the equipment manufacturing industry, which is the welding professional technology of the welding casing of the BCL (vertical split) cylindrical centrifugal compressor, specifically, the centrifugal compressor cylindrical machine made of chrome-molybdenum heat-resistant steel 20CrMo Shell welding process. Background technique [0002] The pressure of the cylinder compressor is relatively high, and it is widely used in petrochemical, coal chemical, oil refining and other fields. Compressor units such as circulating hydrogen, synthetic gas, methanol circulating gas, carbon dioxide compressors, and air separation gas are all made of heat-resistant chromium molybdenum steel. In order to meet the needs of the market and ensure the pressure and strength of the compressor, the shell of the barrel compressor is made of 20CrMo heat-resistant steel. In order to ensure the successful welding of the welded shell of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235
Inventor 刘冬菊王学军孟文惠李品威
Owner SHENYANG BLOWER WORKS GROUP CORP
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