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Method for welding martensite heat-resistant steel

A welding method and seam closing technology, which are applied to welding equipment, arc welding equipment, and the edge of workpieces, etc., can solve the problems of increasing labor and material costs in manufacturing plants, and achieve improved defect detection rates, reduced inventory, and simple production Effect

Active Publication Date: 2019-05-24
HUADIAN ELECTRIC POWER SCI INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For martensitic heat-resistant steel (such as SA336F91), problems such as weld cracks and abnormal hardness are prone to occur during the manufacturing process. For example, in the Chinese patent application number 201410273641.4, some delayed crack defects can even be detected after delivery. This undoubtedly brought unprecedented risks to the manufacturing plant, and at the same time increased the labor and material costs of the manufacturing plant. At the same time, the repeated repairs of the welds also brought safety risks to the subsequent operation of the equipment.

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Embodiment Construction

[0059] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0060] Example.

[0061] A martensitic heat-resistant steel container closing seam welding method is characterized in that it comprises the following steps:

[0062] Step 1. Processing welding groove:

[0063] 100% UT inspection is carried out on the edge of the weld to be welded along the axial direction of 2 times the wall thickness and 30mm in length to prevent interlayer or loose defects. The welding groove is processed by planing machine, and the welding groove is a symmetrical U-shaped welding slope The groove angle is α=22~24°, the blunt edge thickness of the welding groove p=3~4mm, the root radius of the welding groove R1=8~10mm, and the root gap b≤0.5mm;

[0064] Step 2, preparation before welding, the me...

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Abstract

The invention relates to a method for welding martensite heat-resistant steel, and belongs to the field of high-parameter container manufacturing. For solving the problems that the closed seam weldingconstruction of the high-parameter container martensite heat-resistant steel used in a secondary reheating unit is prone to occur the conditions of crack defect, post-welding low hardness and the like, the method comprises the following steps that 1, a welding groove is machined; 2, pre-welding predation is performed; 3, pre-welding is preheated; 4, argon is filled; and 5, welding is performed; if a barrel body is too large, a weld joint is too long, an interlayer temperature is difficult to control, and then a flame heating temperature compensator is adopted to heated in a following mode soas to compensate for temperature loss, if the volume of the barrel body is too large, root oxidation cannot be prevented by establishing a large-scale closed gas protection chamber, and then a specialargon gas protection device is adopted for protection; and in the welding process of the high-alloy steel thick-wall container barrel body, the welding joint is heated in a flame preheating mode, thechange condition of the temperature is difficult to continuously measure, and a temperature monitoring device is arranged at the front end of the to-be-welded weld joint of the container barrel body.According to the method, the number of rework times and the probability can be reduced.

Description

technical field [0001] The invention relates to a welding method of a martensitic heat-resistant steel for closing welds of a steam cooler of a secondary reheating unit, and belongs to the field of high-parameter container manufacturing. Background technique [0002] With the increase of unit parameters, the double reheat ultra-supercritical 1000MW unit technology has been popularized and applied in China, and the design and manufacture of the steam cooler in the double reheat unit is based on the advantage of superheat technology to improve the thermal efficiency of steam , so that the operating parameters of this type of design have been greatly improved, and the material requirements for the metal materials of such containers have been improved, especially for the shell manufacturing of evaporator coolers. 9-12%Cr martensitic heat-resistant steel (such as SA336F91) is used. This type of steel has been widely used in the main steam pipeline. The welding technology of 9-12%...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/235B23K9/00B23K33/00B23K9/095
Inventor 王林刘金秋夏晓涛尚伟冯翌轩李根张雷刘昕颖苏晓阳
Owner HUADIAN ELECTRIC POWER SCI INST CO LTD
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