Welding method for stainless steel pipeline in benzene hydrogenation engineering

A welding method and stainless steel technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of complicated, unreasonable, and unscientific manufacturing processes, achieve safe and reliable welding quality, reduce engineering construction costs, and simple operation Effect

Inactive Publication Date: 2012-10-31
MCC5 GROUP CORP SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the domestic construction or under construction is still in the irregular stage, there are many unscientific and unreasonable places, the production process is complicated and the production cost is high
[0003] Therefore there is above-mentioned inconvenience and problem in known benzene hydrogenation engineering stainless steel pipeline welding

Method used

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  • Welding method for stainless steel pipeline in benzene hydrogenation engineering
  • Welding method for stainless steel pipeline in benzene hydrogenation engineering
  • Welding method for stainless steel pipeline in benzene hydrogenation engineering

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The benzene hydrogenation engineering stainless steel pipeline welding method of the present invention uses a TIG pulse welder to weld 0Cr18Ni9, 00Cr19Ni11 and 0Cr18Ni10Ti brand stainless steel with manual tungsten argon arc welding, and is characterized in that comprising the following steps:

[0042] figure 1 It is a schematic diagram of the pipe-to-pipe butt joint groove structure according to the embodiment of the present invention, figure 2 It is a schematic diagram of the groove angle of the pipe-to-pipe butt joint of the embodiment of the present invention, and the pipe-to-pipe butt joint welding of the stainless steel pipeline is performed.

[0043] a. Pipe section cutting and bevel processing

[0044] Plasma arc or mechanical cutting is used to cut the pipe section, and mechanical methods are used to remove the oxidized pollution layer at the welding groove and the near seam area; the pipe joint with a pipe wall thickness of more than 3mm adopts machining gro...

Embodiment 2

[0054] image 3 It is a schematic diagram of the groove angle of the pipe and the flange joint of the embodiment of the present invention, and the pipe and the flange joint of the stainless steel pipeline are welded by the saddle joint. Plasma arc or mechanical cutting is used, and the oxidation pollution layer is removed mechanically at the welding groove and the near seam area; the branch pipe joints with a pipe wall thickness of more than 3mm are processed by machining groove α=45+5°, p=0, b= 2.0~2.4mm.

[0055] Figure 5 It is a schematic diagram of the protection device for the welding joint between the pipe and the flange according to the embodiment of the present invention, and a protection device using a blind plate on the flange and partial argon filling in the pipe is provided for the joint with the flange. Other technical features of this embodiment are the same as those of Embodiment 1.

Embodiment 3

[0057] In the welding of the branch pipe insertion type and the saddle type welding joint, except that the main pipe and the branch pipe are partially sealed with argon-filled protection device, other technical features are the same as those in embodiment 1 or 2.

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Abstract

The invention discloses a welding method for a stainless steel pipeline in a benzene hydrogenation engineering, wherein the stainless steel of grades 0Cr18Ni9, 00Cr19Ni11 and 0Cr18Ni10Ti is welded via manual argon tungsten-arc welding by using a TIG (tungsten inert gas) pulse welding machine. The welding method is characterized by comprising the following steps of: a, cutting pipe sections and machining grooves; b, providing an argon protecting device; and c, welding, which includes the following steps of: (1) cleaning before welding, (2) performing solid-state welding on assembly points, (3) arranging spot welding points, and (4) penetrating welding seams and ensuring good formation. The welding method for a stainless steel pipeline in a benzene hydrogenation engineering disclosed by the invention has the advantages of being reasonable in design for construction steps, simple in operation, safe and reliable in welding quality, and decreased in engineering construction cost.

Description

technical field [0001] The invention relates to a welding method for pipelines, in particular to a welding method for stainless steel pipelines in benzene hydrogenation engineering. Background technique [0002] The process of benzene hydrogenation unit is quite special, its system is complicated, there are many equipments, the pressure and temperature of the system itself are high, and the pump equipment is not allowed to run idle. The benzene hydrogenation project is mainly divided into the central control room and substation, refining device, water supply and drainage project, air compressor station, storage and transportation facilities (tank farm and pump room), power supply for the whole plant and lighting for the whole plant, torches and ancillary projects Facilities, in the electrical installation of these facilities, there are special requirements for lightning protection, fire protection, and explosion protection. Among them, the process medium pipelines of the ben...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167
Inventor 廖兴银陈和平寇大伟冯娜
Owner MCC5 GROUP CORP SHANGHAI
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