Welding process of megaton ethane compressor casing

Abstract

The invention relates to a welding technology in the equipment manufacture industry and relates a special welding technology of an MCL (Mean Control Limit) type horizontally-split centrifugal compressor welder casing, in particular to a welding technology of a megaton ethane centrifugal compressor welder casing with forgeable pieces of 16 Mn and Q345R and ZQ230-450 materials. Gas shielded welding is adopted to weld the welder casing with the forgeable pieces of 16 and the Q345R low alloyed steel, and an electrode in a brand of H08Mn2SiS with a diameter shown in the specification, power supply polarity of DCRP (Direct Current Reverse Polarity) is adopted and comprises fore-welding treatment, welding process and post-welding treatment, wherein the welding process comprises the following process parameters: a welding current is 250-280 A, a welding voltage is 28-32 V, a protective mixed gas comprises 80 percent by volume of Ar and 20 percent by volume of CO2, a welding speed is 280-320 mm/min, the dry extension is 20-25 mm, and the gas flow is 15-20 L/min. The invention can solve the problems of welding deformation, layered tearing, low welding efficiency, and the like and ensure the welding seam strength by selecting an MAG (Metal Active Gas) shielded welding material with similar chemical contents and matched strength with a welder casing material.

Description

Technical field: [0001] The invention relates to the welding technology in the equipment manufacturing industry. It is the welding professional technology of the welding casing of the MCL type horizontal split centrifugal compressor, specifically, it is a million-ton ethylene centrifugal compressor made of 16Mn forgings, Q345R, and ZG230-450 materials. Welding process for welding casing. Background technique: [0002] The casings of the cracked gas and propylene compressor units of the supporting equipment of the million-ton ethylene plant are all welded. The welded casing is composed of multiple parts, among which the upper and lower flanges in the welded casing are the key components of the welded casing. The upper flange of the split surface is 380mm thick, and the lower flange is 300mm thick, which are welded with the upper and lower sealing bodies respectively. Due to the welding of ultra-thick plates, the flange groove is large and the weld seam is deep, which increa...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a welding process for the welding casing of a million-ton ethylene centrifugal compressor combining 16Mn forgings, Q345R low-alloy steel plates, and ZG230-450 castings, so as to solve welding deformation, lamellar tearing and welding efficiency, etc. The problem is that by choosing the welding material for MAG gas shielded welding that is similar in chemical composition and strength to the material of the welding shell, the strength of the weld can be guaranteed

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