Welding method for thick-wall alloy pipeline of needle coke device

A welding method and needle coke technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve problems such as high-altitude quenching tendency, difficulty in ensuring welding quality, and welding cold cracks

Pending Publication Date: 2021-04-27
CHINA NAT CHEM ENG NO 14 CONSTR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The alloy steel pipe made of 1Cr5Mo has good high temperature resistance and high temperature oxidation corrosion resistance, but has a high tendency of air quenching; the welding quality is difficult to be guaranteed by conventional welding methods, and welding cold cracks are easy to occur after welding. and easy to expand

Method used

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  • Welding method for thick-wall alloy pipeline of needle coke device
  • Welding method for thick-wall alloy pipeline of needle coke device
  • Welding method for thick-wall alloy pipeline of needle coke device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: A welding method for a thick-walled alloy pipe of a needle coke device, wherein the material of the alloy pipe is 1Cr5Mo, comprising the following steps:

[0028] Step 1: Material selection: select the welding wire and electrode with the same alloy composition as the pipe material to be welded;

[0029] Step 2: Groove preparation and joint alignment: process the groove on the end of the pipe to be welded, and group the grooves between two adjacent pipes, and control the gap between the groups at 2.5 mm;

[0030] Step 3: Preheating before welding, the preheating temperature is controlled between 250°C, and the heating range is at least 100mm on both sides of the weld;

[0031] Step 4: Multi-layer and multi-pass welding: multi-layer and multi-pass welding is adopted during the welding process, the thickness of each layer of weld bead is ≤3mm, and the width of each weld seam is ≤8mm; the interlayer temperature during the welding process is not lower than the ...

Embodiment 2

[0040] Embodiment 2: A welding method of a thick-walled alloy pipe of a needle coke device, the material of the alloy pipe is 1Cr5Mo, comprising the following steps:

[0041] Step 1: Material selection: select the welding wire and electrode with the same alloy composition as the pipe material to be welded;

[0042] Step 2: Groove preparation and joint alignment: process the groove on the end of the pipe to be welded, and group the grooves between two adjacent pipes, and control the gap between the groups to 3.0mm;

[0043] Step 3: Preheating before welding, the preheating temperature is controlled between 280°C, and the heating range is at least 100mm on both sides of the weld;

[0044] Step 4: Multi-layer and multi-pass welding: multi-layer and multi-pass welding is adopted during the welding process, the thickness of each layer of weld bead is ≤3mm, and the width of each weld seam is ≤8mm; the interlayer temperature during the welding process is not lower than the preheating...

Embodiment 3

[0053] Embodiment 3: A welding method for a thick-walled alloy pipe of a needle coke device, wherein the material of the alloy pipe is 1Cr5Mo, comprising the following steps:

[0054] Step 1: Material selection: select the welding wire and electrode with the same alloy composition as the pipe material to be welded;

[0055] Step 2: Groove preparation and joint alignment: process the groove on the end of the pipe to be welded, and group the grooves between two adjacent pipes, and control the gap between the groups to 3.5 mm;

[0056] Step 3: Preheating before welding, the preheating temperature is controlled between 300°C, and the heating range is at least 100mm on both sides of the weld;

[0057] Step 4: Multi-layer and multi-pass welding: multi-layer and multi-pass welding is adopted during the welding process, the thickness of each layer of weld bead is ≤3mm, and the width of each weld seam is ≤8mm; the interlayer temperature during the welding process is not lower than the ...

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Abstract

The invention discloses a welding method for a thick-wall alloy pipeline of a needle coke device. The alloy pipeline is made of a 1Cr5Mo material. The welding method comprises the following steps of material selection, groove preparation and joint pairing, preheating before welding, multi-layer and multi-pass welding and heat treatment. According to the welding method, through proper material selection, preparation of a welding groove and multi-layer and multi-pass welding, welding heat input can be reduced, and welding line energy is controlled; in addition, through heat treatment of a rear-layer welding pass on a front layer, grains can be refined, and the comprehensive performance of a welding joint is improved; and during heat treatment after welding, preheating treatment is conducted firstly, austenite is completely converted into martensite, then tempering heat treatment is conducted, the hardness of all areas of the joint can be reduced, the toughness, the deformation capacity and the high-temperature endurance strength of the joint are improved, the internal stress of the joint is eliminated, and welding cracks are greatly reduced.

Description

technical field [0001] The invention relates to the technical field of alloy pipeline welding, in particular to a welding method for a thick-walled alloy pipeline of a needle coke device. Background technique [0002] Needle coke is a high-quality material for manufacturing high-power and ultra-high-power electrodes, and the domestic needle coke market has just started. Due to the characteristics of high temperature and high pressure in the production process of the needle coke unit, medium alloy heat-resistant steel is mainly used in the selection of pipeline materials. As an important part of the needle coke unit, the alloy steel pipeline plays a vital role. [0003] The alloy steel pipe made of 1Cr5Mo has good high temperature resistance and high temperature oxidation corrosion resistance, but has a high tendency of air quenching; the welding quality is difficult to be guaranteed by conventional welding methods, and welding cold cracks are easy to occur after welding. An...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/16B23K9/235
CPCB23K9/23B23K9/235B23K9/16
Inventor 李建岭郑志刚刘伟
Owner CHINA NAT CHEM ENG NO 14 CONSTR
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