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Girth welding process for thick-wall header and pipeline on power station boiler

A technology for power station boilers and circumferential seam welding, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as breakdown, and achieve the effect of reducing internal stress, avoiding internal defects, and reducing physical harm.

Active Publication Date: 2021-11-05
哈尔滨红光锅炉总厂有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved in the present invention is: the existing submerged arc welding is easy to cause breakdown when welding headers and pipes of power station boilers with a diameter of 219 mm and a wall thickness of 20 to 55 mm, and the automatic submerged arc welding method cannot be used accurately and efficiently. Quickly complete the girth welding; and then provide a girth welding process for thick-walled headers and pipes on power plant boilers

Method used

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  • Girth welding process for thick-wall header and pipeline on power station boiler
  • Girth welding process for thick-wall header and pipeline on power station boiler
  • Girth welding process for thick-wall header and pipeline on power station boiler

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Embodiment 1

[0054] Embodiment 1: Taking a pipe whose parent material is 12Cr1MoVG, whose specification is 219 mm in diameter, and whose pipe wall thickness is 45 mm as an example, the girth welding process of the invention will be described in detail, and the process flow is as follows:

[0055] S1. Welding groove treatment: UV groove processing is performed on the opposite end faces of the two pipes to be welded. The slope of the processed V-shaped groove is 10°, and the arc-shaped slope of the U-shaped groove is The radius of the face is 5mm, and the height of the vertical face of the blunt edge is 2.5mm;

[0056] S2. Cleaning of the surface of the welding groove: use a grinder and a wire brush to remove residual dirt such as rust on the surface of the welding groove and the area extending 20mm to both sides of the welding groove, and use flame heating to clean the welding groove Dry the oil and moisture on the surface;

[0057] S3. Workpiece groove butt joint: Align the two workpieces...

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Abstract

The invention relates to a girth welding process, in particular to the girth welding process for a thick-wall header and a pipeline on a power station boiler. The girth welding process aims to solve the problems that the existing submerged arc welding is easy to break down when being used for welding the power station boiler header and pipeline with the diameter phi of 219 mm and the wall thickness of 20mm-55 mm, and the girth welding cannot be accurately and quickly finished by an automatic submerged arc welding method. According to the girth welding process, a series of problems existing in the girth welding process of a traditional power station boiler header and pipeline with the specification of phi 219 * 20mm-55 mm are solved through the eight procedures of welding groove machining, welding groove surface cleaning, workpiece groove butt joint, preheating before welding, argon arc welding bottom sealing, manual electric arc welding filling thickening, submerged arc welding and post-heating or hydrogen elimination treatment after welding, and the welding quality and the welding efficiency are improved. The girth welding process is mainly used for welding the thick-wall header and the pipeline on the power station boiler.

Description

technical field [0001] The invention relates to a circular seam welding process, in particular to a circular seam welding process for thick-walled headers and pipes on power plant boilers. Background technique [0002] The headers and pipes (hereinafter collectively referred to as workpieces) on the utility boiler are important components of the utility boiler, and the welding quality of the headers and pipes on the utility boiler directly affects the quality of the boiler and the safe and stable operation of the boiler. Girth welding methods include electrode arc welding (SMAW), submerged arc welding (SAW), gas tungsten shielded welding (GTAW), etc., among which submerged arc welding is a commonly used welding method for girth seams. [0003] Submerged arc welding (SAW) is a welding method in which the arc burns under the flux layer. It has excellent welding consistency, high precision, high production efficiency, stable welding quality and no arc radiation. It is widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/028B23K9/16B23K9/18B23K9/235
CPCB23K9/028B23K9/18B23K9/235B23K9/16
Inventor 刘波崔玉伟苏美荣彭莹莹张佳宦邢磊赵洪玉刘延龙王春龙李红赵红
Owner 哈尔滨红光锅炉总厂有限责任公司
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