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A Method of Using Thermal Simulation Technology to Determine the Welding Parameters of X100 Pipeline Steel Stress Corrosion Cracking Resistance

A welding parameter, corrosion cracking technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as improper selection of welding parameters, affecting pipeline safety, cracking of welded joints, etc., to reduce time cost and economy Cost, simplification of welding operation steps, effect of process specification

Active Publication Date: 2021-11-05
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sulfide stress corrosion cracking is due to the hydrogen embrittlement caused by the diffusion of hydrogen into the defect site in the material, leading to the failure of the pipeline
Therefore, the quality of welded joints will directly affect the safety of the entire pipeline. Improper selection of welding parameters will easily lead to cracks in the heat-affected zone of welded joints after a period of service.

Method used

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  • A Method of Using Thermal Simulation Technology to Determine the Welding Parameters of X100 Pipeline Steel Stress Corrosion Cracking Resistance
  • A Method of Using Thermal Simulation Technology to Determine the Welding Parameters of X100 Pipeline Steel Stress Corrosion Cracking Resistance
  • A Method of Using Thermal Simulation Technology to Determine the Welding Parameters of X100 Pipeline Steel Stress Corrosion Cracking Resistance

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Step 1, base material selection: select the domestic X100 base material, the material properties and chemical composition are as follows:

[0025]

[0026]

[0027]

[0028] Step 2, sample processing: process a round bar-shaped sample of φ10*100mm along the X100 base metal rolling direction for thermal simulation.

[0029] Step 3, thermal simulation experiment: Take a round rod of φ10*100mm, and weld a thermocouple wire on the center to detect the relationship between temperature and time. Heat at 130°C / S to 1350°C, keep it warm for 1S (that is, simulate the coarse-grained heat-affected zone), then cool at 80°C / S to 900°C, and separate different samples at t 8 / 5 Cool to room temperature for 5S, 10S, 15S, 20S, 25S, 30S, 40S, 50S, 60S, 80S, 100S

[0030] Step 4, slow tensile test: process the thermally simulated sample into a slow tensile sample, and the tensile rate for the experiment is 1*10 -6 mm / s, the solution is the standard NACE A solution, namely: the m...

Embodiment 2

[0041] The following experiments are based on thermal simulation technology, using Gleeble3500 testing machine, X100 pipeline steel manual arc welding welding process, and determine according to the following steps:

[0042] Gleeble3500 testing machine, with extremely fast cooling and heating, can record temperature, force, stress, strain and other parameter change curves at the same time, and can accurately simulate the relationship between the process of welding metal materials and the change of material properties in each stage, and can accurately simulate different Welding microstructures with different heat inputs in different regions. Using this equipment, the machined base metal with a diameter of φ10mm is tested with different parameters to simulate the welding process and obtain the coarse-grained structure of the welding heat-affected zone under different cooling rates. Since the strength of the X100 base material is much higher than 480MPa, it does not meet the requ...

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Abstract

The invention discloses a method for determining the stress corrosion cracking resistance welding parameters of X100 pipeline steel by using thermal simulation technology. According to the welding method of the invention, the appropriate welding line heat can be quickly selected, and the parameters of each stage are strictly and reasonably controlled, and the process is standardized. , reducing time cost and economic cost, thereby comprehensively improving the development of welding process for X100 pipeline steel under wet hydrogen sulfide service conditions; The advanced post-weld heat treatment simplifies the welding operation steps and improves the welding work efficiency under the condition of ensuring the welding quality.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to the development of a welding process for stress corrosion cracking resistance in the heat-affected zone of an X100 pipeline steel welded joint, especially under the condition that the strength of the X100 base metal is greater than 480 MPa and does not meet the general standard NACESP0472-2010. The development of the welding process can be completed at low cost. Background technique [0002] Oil and natural gas are important energy sources for the survival of human society and an important material basis for social and economic development. Pipeline transportation of oil and gas is the most economical, efficient, safe and environmentally friendly transportation method. my country's pipeline construction began in 1949. From the 1960s to the 1980s, the development of oil and gas fields represented by Daqing Oilfield and Sichuan Gas Field led to the rapid development of my countr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/12B23K103/04
CPCB23K31/12
Inventor 韩永典王睿哲徐连勇赵雷荆洪阳
Owner TIANJIN UNIV