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Numerical simulation method for P92 steel tube welding heat affected zone

A welding heat-affected zone and numerical simulation technology, applied in electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as affecting high temperature performance, reducing material toughness, and performance component differences

Active Publication Date: 2013-08-14
TIANJIN UNIV
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Problems solved by technology

However, due to the obvious difference in performance and composition of the traditional boiler steel austenitic steel, the welding of dissimilar steels between it and the new austenitic heat-resistant steel is a major difficulty in current boiler manufacturing.
When P92 and S30432 are welded, the heat-affected zone formed by the base metal near the weld reduces the toughness of the material, thereby affecting its high-temperature performance
At the same time, some studies have shown that when the P92 welded structure is in service at high temperature, creep cracking is prone to occur in the heat-affected fine-grained area, which seriously affects the service life of the component.

Method used

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  • Numerical simulation method for P92 steel tube welding heat affected zone
  • Numerical simulation method for P92 steel tube welding heat affected zone
  • Numerical simulation method for P92 steel tube welding heat affected zone

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Embodiment Construction

[0025] The technical scheme of the present invention will be further described below in conjunction with specific examples. In order to achieve the above-mentioned purpose of the invention, the simulation of the welding temperature field between P92 and S30432 should be carried out at first, and then the analysis should be carried out according to the simulation results to find out the width of the heat-affected zone at the end of P92. The relationship between the distribution and welding current.

[0026] The analysis process mainly includes the following steps:

[0027] (1) Establish a welding model and assign material thermophysical coefficients: the length of the model is 200mm, the wall thickness is 10mm, the outer diameter is 45mm, the weld seam is V-shaped groove, and the groove angle is 70°. After completing the establishment of the overall model, define the thermophysical coefficients of different materials in the Property module, including the thermal conductivity, l...

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Abstract

The invention discloses a numerical simulation method for a P92 steel tube welding heat affected zone. A double-ellipsoid heat source model close to the actual welding state is selected as a heat source model, through programming, heat sources move along pipelines circumferentially under different welding currents, and the actual welding state is really simulated. The temperature variation of an external wall node of the last welding joint close to a P92 end is selected, and the change rule of the width of the heat affected zone along with welding currents is found. By means of the numerical simulation method, the actual welding process can be guided effectively, so that appropriate welding currents can be obtained, and the failure probability of the P92 in the heat affected zone can be reduced.

Description

technical field [0001] The invention relates to the field of computer numerical simulation, and more specifically relates to a method for numerically simulating the width of the heat-affected zone of P92 and S30432 dissimilar steel pipe welding based on abaqus. Background technique [0002] The new P92 martensitic heat-resistant steel has become one of the commonly used steel types for superheaters, reheaters and main steam pipes of ultra-supercritical units due to its excellent creep resistance, good corrosion resistance and high temperature oxidation resistance. However, due to the obvious differences in performance and composition of the traditional boiler steel austenitic steel, the welding of dissimilar steels between it and the new austenitic heat-resistant steel is a major difficulty in the current boiler manufacturing. When P92 and S30432 are welded, the heat-affected zone formed by the base metal adjacent to the weld reduces the toughness of the material, thereby af...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 徐连勇乔汉文荆洪阳韩永典
Owner TIANJIN UNIV
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