Welding process of ultra-supercritical fossil power unit for welding SA335-P91/P92 steel
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A technology of SA335-P91, thermal power unit, applied in welding equipment, arc welding equipment, manufacturing tools, etc., to achieve the effect of improving first-time welding pass rate, improving input technology, and solving welding quality problems
Inactive Publication Date: 2012-08-01
GUANGDONG SHAOGUAN YUEJIANG POWER GENERATION
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[0007] The purpose of the present invention is to solve the problems existing in the welding of SA335-P91 / P92 steel in the prior art, and to provide a welding process for welding SA335-P91 / P92 steel of ultra-supercritical thermal power units that can ensure that the impact energy reaches 410J
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specific Embodiment 1
[0038] Figure 1-Figure 4 Constitute the specific embodiment 1 of the present invention.
[0039] refer to figure 1 , this embodiment includes three aspects of preparation before welding, optimization of welding parameters and optimization of welding process,
[0040] 1) Preparation before welding
[0041] Select the workpiece and use manual arc welding rod as the welding workpiece;
[0042] Set up the weld bead, set the weld bead into a double V-shaped groove shape, and clean the surface of the groove;
[0043] Carry out counterpart assembly, place the pipeline to be welded in the aforementioned weld bead, and place the pipeline firmly after the counterpart connection of each section. The requirements for the counterpart of each pipeline are: misalignment 0.1-1.0mm, gap 3.0-4.0mm, blunt edge 1.5- 2.0mm;
[0044] For large-diameter thick-walled pipes, use positioning blocks to fix them in the groove;
[0045] 2) Optimization of welding parameters
[0046] Select the wel...
specific Embodiment 2
[0076] refer to Figure 5 with Image 6 , The main features of the specific embodiment 2 of the present invention are: the welding bead is set to a double V-shaped groove shape, and the surface of the groove is cleaned, and the electrode material is CHROMET92. All the other are with specific embodiment 1.
[0077] P91 steel is equivalent to the national standard 10Cr9Mo1VNb. This steel not only has high oxidation resistance and high temperature steam corrosion resistance, but also has good impact toughness, high and stable durable plasticity and thermal strength. When the service temperature is lower than 620°C, its allowable stress is higher than that of austenitic stainless steel. Above 550°C, the recommended design allowable stress is about twice that of T9 and 2.25Cr-1Mo steel. It can be used as high-temperature superheater and reheater steel pipes for subcritical and supercritical boilers with a wall temperature of ≤625°C, as well as high-temperature headers and steam ...
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Abstract
The invention relates to a welding process of an ultra-supercritical fossil power unit for welding SA335-P91/P92 steel. The process is characterized by comprising three aspects of preparation before welding, welding parameter optimization and welding process optimization. In workpiece selection, a manual arc welding electrode is used as a welding workpiece; in welding bead arrangement, a welding bead is arranged in a double V-shaped or U-shaped groove shape, and the surface of the groove is cleaned; contra-aperture assembly is carried out, pipelines to be welded are arranged in the welding bead, each section of pipeline is propped firmly after contra-aperture connection, and the requirements on the contra-aperture of each section of pipeline are that: the staggered joint is 0.1-1.0mm, the gap is 3.0-4.0mm, and the truncated edge is 1.5-2.0mm; a large-diameter thick-wall pipe is fixed in the groove by a positioning block; and a welding area is preheated before welding, and then multi-layer welding bead welding is carried out in a GTAW (gas tungsten arc welding) and SMAW (shielded metal arc welding) combined welding method. According to the welding process disclosed by the invention, a multi-layer welding bead welding technology with a small-dimension electrode, a small current parameter and small swing is adopted, the impact toughness of a weld joint is improved, and the first-pass yield of welding can be greatly improved.
Description
technical field [0001] The invention relates to a welding process, in particular to a welding process for welding SA335-P91 / P92 steel of an ultra-supercritical thermal power unit. The utility model belongs to the technical field of thermal power unit welding. Background technique [0002] With the development of the electric power industry and the increasing global concern for environmental issues, saving primary energy, strengthening environmental protection, reducing harmful exhaust emissions, and reducing the global warming effect have attracted great attention at home and abroad. Improving the thermal efficiency of thermal power units and adopting supercritical and ultra-supercritical units is one of the effective ways to prevent environmental pollution. Resource-saving and environment-friendly unit is a new trend of thermal power generation equipment. [0003] In the prior art, the improvement of boiler unit parameters in large thermal power plants mainly relies on ne...
Claims
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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235B23K9/095B23K33/00
Inventor 方江涛
Owner GUANGDONG SHAOGUAN YUEJIANG POWER GENERATION
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