Operating method for welding fillet weld of tube seat on header

An operation method and fillet weld technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as poor welding performance, reduce line energy, prevent welding cracks, and improve performance.

Inactive Publication Date: 2011-08-17
格菱动力设备(中国)有限公司
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for welding HRSG P91 header pipe seat fillet welds, which can overcome the problem of poor welding performance due to the use of SA-335 P91 material on the current boiler header

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  • Operating method for welding fillet weld of tube seat on header
  • Operating method for welding fillet weld of tube seat on header
  • Operating method for welding fillet weld of tube seat on header

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specific Embodiment approach

[0024] Specific embodiments: The present invention will be further described below in conjunction with the drawings;

[0025] The operation method of the fillet welding of header pipe seat is characterized in that the welding steps are as follows

[0026] 1. Bottom welding of fillet weld of header pipe seat

[0027] 1.1 The base fillet weld of the pipe seat is welded by manual argon arc welding. Due to the poor weldability of the material, both sides of the welding groove must be cleaned, and there should be no impurities such as rust, oil, and water; the blunt edge of the pipe seat is 1.0 mm, and there is a certain straight section, there is no gap between the pipe seat and the header body;

[0028] 1.2 SA-335 P91 material is prone to welding cracks, so during the bottom welding, the thickness of the deposited metal should not be too thin to prevent welding cracks due to the small boundary area of ​​the deposited metal and cannot bear the stress. Generally, the thickness of the weld ...

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Abstract

The invention provides an operating method for welding a fillet weld of a tube seat on an HRSG P91 header, which solves the problems in the traditional welding method of SA-335P91 material adopted on a boiler header. The operating method featured by bottom layer welding for the fillet weld of the tube seat on the header, intermediate layer welding for the fillet weld of the tube seat, facing layer welding for the fillet weld of the tube seat and multilayer and multichannel welding with no oscillation as much as possible is adopted, and an annealing weld bead is formed during facing. Heat input can be reduced appropriately so that the primary qualified rate of supersonic flaw detecting reaches over 99%, inward recessing, crack and other defects of a bottom layer are effectively prevented, and the flat and eye-pleasing metal surface of a weld seam is maintained.

Description

technical background: [0001] The invention relates to an operation method for the fillet weld welding of the HRSG P91 header pipe seat. Background technique: [0002] With the development of the power industry, my country's power station boilers are gradually developing in the direction of high temperature, high pressure and large capacity, and the operating parameters of the boilers are constantly improving. In order to meet the needs of the development of boilers, higher requirements have been put forward for the selection of materials for boiler parts, and the materials for high temperature and high pressure parts have gradually developed in the direction of high alloying. The application of these high-alloy materials in boiler components has added a certain degree of difficulty to the manufacture of the boiler, especially in recent years, SA-335 P91 material has been used on the boiler header. SA-335 P91 is a 9Cr1MoVNb martensitic heat-resistant steel. This material has rela...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16
Inventor 谢志庆
Owner 格菱动力设备(中国)有限公司
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