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Large-wall-thickness P92 steel welding method

A welding method and technology with large and thick walls, applied in welding equipment, welding accessories, arc welding equipment, etc., can solve the problems of cold welding cracks, type IV creep cracks, and low toughness of weld metal.

Inactive Publication Date: 2020-10-23
陕西榆林能源集团横山煤电有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] P92 steel contains about 0.08wt.% C, 9wt.% Cr, 1.75wt.% W and 0.5wt.% Mo and other alloying elements, which are prone to welding cold cracks and low weld metal toughness during welding and use. Type creep cracks and other issues

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  • Large-wall-thickness P92 steel welding method
  • Large-wall-thickness P92 steel welding method
  • Large-wall-thickness P92 steel welding method

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Embodiment Construction

[0026] The present invention will be further described below in conjunction with the examples, and the mode of the present invention includes but not limited to the following examples.

[0027] A welding method for large thick-walled P92 steel, through reasonable control of each parameter in the welding process, reduces the tensile residual stress generated in the welding process, avoids cold cracks, reduces the influence of creep resistance, and avoids the creep stress Generated, the specific implementation process is as follows:

[0028] First, grind the welding seam of P92 steel to make the welding groove. If the equipment has already polished the welding groove, you only need to clean the welding groove. The welding groove can be set to "Y shape" or "V shape". and other shapes, in this embodiment, the welding groove is set as "comprehensive shape" or "double V shape". After the welding groove is polished, the oil, Clean up the paint, scale, rust, etc. until it emits a met...

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Abstract

The invention discloses a large-wall-thickness P92 steel welding method. The method comprises the following steps of forming and cleaning a welding groove; preheating the welding groove before welding, and then performing backing by adopting a GTAW welding method; welding a welded joint with a welding rod of phi3.2 with an SMAW welding method, wherein a weaving method for a swinging fast thin layer is adopted during welding; performing polishing inspection on a welding layer, and determining the crack cleaning method; repeating the steps above till welding of the whole welding groove is finished; facing the welding groove by adopting the SMAW welding method; and performing thermal treatment on the welded joint. Through reasonable optimization of parameters in the welding process, a properpreheating temperature, inter-layer temperature and thermal treatment temperature are kept. The performance of the welded joint is matched optimally through adoption of a reasonable welding process, so that the P92 steel welding quality is improved, and beneficial guarantee is provided for the normal running of equipment pipelines.

Description

technical field [0001] The invention relates to the technical field of pipeline welding, in particular to a welding method for a large thick-walled steel pipe made of P92 steel. Background technique [0002] SA335-P92 steel is a kind of fine-grained toughened heat-strength steel improved on the basis of P91 steel through ultra-purity smelting, controlled rolling technology and micro-alloying technology. Due to its high strength, high temperature oxidation resistance and corrosion resistance, and good plasticity and toughness, P92 steel is mainly used in ultra-supercritical unit boilers and four major pipelines. Its manufacturing difficulty and technical content are much higher than P91 steel pipes. With the improvement of smelting and manufacturing technology in the domestic iron and steel industry in recent years, especially through the introduction of advanced technology and equipment by some large enterprises and continuous exploration of experience, my country's ability ...

Claims

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Application Information

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IPC IPC(8): B23K9/235B23K9/32
CPCB23K9/235B23K9/32
Inventor 王强安洪亮冯瑞靳彤郝龙宇张宏旭郝学峰马一鸣王博马仲远韩蕾李苏珊李善跃宋北李伟艾亮艾磊
Owner 陕西榆林能源集团横山煤电有限公司
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