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Domestic 08Ni3DR steel thin multi-pass welding process

A welding process, 08ni3dr technology, is applied in the field of domestic 08Ni3DR steel thin-layer multi-pass welding welding process, which can solve the problems of equipment production and manufacturing constraints, high manufacturing costs, long manufacturing cycles, etc., to ensure safety, reliability, technical and economic benefits. Significant social benefits

Active Publication Date: 2012-12-05
WUHAN EAST PETROCHEM HEAVY EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the past 20 years, the materials used in the manufacture of low-temperature pressure vessels in the above two fields in my country have mainly relied on imports from developed countries, and the production and manufacturing of equipment has been greatly restricted. The manufacturing cost is high and the manufacturing cycle is long, which cannot meet the needs of the development of my country's coal chemical industry. The Urgent Need for the Application of Cryogenic Equipment Technology

Method used

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  • Domestic 08Ni3DR steel thin multi-pass welding process
  • Domestic 08Ni3DR steel thin multi-pass welding process
  • Domestic 08Ni3DR steel thin multi-pass welding process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Example 1: The base material is low-temperature steel of type 08Ni3DR, the thickness of the plate is 16mm, the type of welding wire is OE-S2Ni3, the flux is 0P121TTW, the positioning electrode is OE-CRYO87, and the thickness coverage of the base material is assessed to be 12-32mm.

[0023] refer to figure 1 , the numbers in the figure indicate the distribution of the welding layers and the order of the welding layers.

[0024] (1) Process the workpiece to be welded into a single V-shaped groove with a groove angle of 60°±5°, and remove harmful impurities such as oil, water, rust, slag and burrs within 20mm on both sides of the groove, Reveals a metallic luster.

[0025] Conduct (WT) magnetic particle testing on the groove to ensure that there is no surface crack at the groove.

[0026] Check the surface of the welding wire for oil stains, and dry the flux at 300°C for 2 hours.

[0027] (2) Assembling to ensure that the misalignment of the workpiece to be welded is 2 ...

Embodiment 2

[0034] Example 2: The base material is low-temperature steel of model 08Ni3DR, the plate thickness is 40mm, the welding wire model is OE-S2Ni3, the flux is 0P121TTW, the positioning electrode is OE-CRYO87, and the plate thickness coverage of the base material is assessed to be 30-200mm.

[0035] refer to figure 2 , the numbers in the figure indicate the distribution of the welding layer and the order of the welding layers. The welding layer has 20 layers in total. The workpiece to be welded is processed into a symmetrical double V-shaped groove, and the groove angle is 55°±5°. The welding process steps Same as Example 1, technical parameters such as welding current, voltage, welding speed, and interlayer temperature are shown in Table 2 of process parameters.

[0036] Table 2: Process parameter table

[0037]

[0038]

[0039] Low-temperature methanol washing key equipment H manufactured by 08Ni3DR steel thin-layer multi-pass welding process 2 S, CO 2 Absorption towe...

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Abstract

The invention discloses a domestic 08Ni3DR steel thin multi-pass welding process, which is characterized by comprising the following steps of: machining a welding part into a single V-shaped or symmetrical double V-shaped groove, employing thin layer multi-pass welding, wherein on each layer, the weld pass thickness is less than 3mm, the diameter of a welding wire is 3.2mm, the welding current is 350 to 380A, the welding voltage is 34 to 38V and the welding speed is 36 to 45cm per minute, and controlling the interlayer and inter-pass temperature to be less than or equal to 150 DEG C; and performing dehydrogenation treatment and overall stress relief heat treatment after welding, and manufacturing a pressure container with the temperature level of 100 DEG C below zero such as main low temperature methanol wash equipment H2S and a CO2 absorption tower by employing the process, wherein the impact work kv2 of the welding joint of the equipment at the temperature of 101 DEG C below zero is more than or equal to 47J, and the mean value of the technical index and physical level is higher than American society of mechanical engineers (ASME) standard technical index.

Description

technical field [0001] The invention relates to the technical field of metal welding, in particular to a domestic 08Ni3DR steel thin-layer multi-pass welding welding process. Background technique [0002] With the further increase of international crude oil prices, the investment in my country's coal chemical industry will increase significantly. As the source project of the coal chemical industry chain, the coal-to-methanol project has a good market prospect and a large market scale. As the main process equipment for low-temperature methanol washing, the absorption tower will further increase the market demand. [0003] The low-temperature methanol washing device has been widely used in my country's residue oil and coal-based fertilizers, coal chemical industry, and coal-to-oil industries. Among them: -100℃~-60℃ low-temperature pressure vessels (H 2 S, CO 2 Absorption tower) is the key core equipment in the low-temperature methanol washing process; in the petrochemical fi...

Claims

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Application Information

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IPC IPC(8): B23K9/00B23K9/235B23K33/00C21D9/50
Inventor 李俊松
Owner WUHAN EAST PETROCHEM HEAVY EQUIP
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