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T91 water wall tube row welding process

A technology of welding technology and water-cooled wall tubes, applied in welding equipment, manufacturing tools, arc welding equipment, etc., can solve the problems of increased cost, cracks, time wasting, etc., and achieve the effects of stable arc combustion, convenient operation, and simple process

Active Publication Date: 2017-03-08
JIANGSU GREENLEAVES BOILER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The water-cooled wall is the main heating part of the boiler. It is composed of several rows of steel pipes and distributed around the boiler furnace. Its interior is flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. Generally, the water-cooled wall is composed of multiple tubes. It is made of sub-welding, the original welding process will always have cracks at the weld seam, and the cracks will become larger and larger during operation or use, and repair welding is required, which not only wastes time, but also increase cost

Method used

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Examples

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Embodiment 1

[0032] Prepare materials T91 pipe, Φ51*6, L=1000mm / section, 2 sections; 12CrlMoV flat steel, 6*40, L=1000mm / section, 1 section.

[0033] 1. T91 water-cooled wall pipe row welding process, characterized in that: the welding process includes the following steps:

[0034] (1) Cleaning before welding: before welding, polish the rust and oil stains on T91 pipes and flat steel until the metallic luster is exposed;

[0035] (2) Welding material preparation: Prepare welding wire and flux. In the step (2), the welding wire is H08CrMoVA with a diameter of 1.2-2.0 mm, the flux is SJ501, and the flux is baked before use. The baking temperature is 300-350 ° C, and the baking time is 1-2h;

[0036] (3) Spot welding before welding: R317 electrode is used for electric welding of flat steel and T91 pipe. The diameter of electrode R317 is 2.5-5.0mm. The electrode needs to be baked. Place the welding rod in the welding rod insulation tube for use;

[0037] (4) Preheating before welding: prehe...

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Abstract

The invention relates to a T91 water wall tube row welding technology. The welding technology comprises the steps of (1) cleaning before welding; (2) welding material preparation: preparing welding wires and flux, and performing baking before flux use, wherein the baking temperature is in a range of 250 DEG C to 400 DEG C, and the baking time ranges from 0.5h to 3h; (3) spot welding before welding: using R317 welding wires to flat steel and T91tube electric welding, wherein the welding strips are needed to be baked; (4) preheating before welding: performing preheating before welding to enable all portions of materials to be welded to be uniform in heating; (5) tube row welding: performing welding in the condition of the 300A-320A welding current, 26V-27V welding voltage and 80mm / min-90mm / min and performing coverage with asbestos immediately after front welding seams are welded; (6) hydrogen removal after welding; (7) detection; (8) thermal treatment. The welding technology is simple and convenient to operate, covering through insulation cotton is performed after welding, and accordingly, cracks due to rapid cooling can be prevented.

Description

technical field [0001] The invention belongs to the technical field of boiler manufacture, and in particular relates to a welding process of water-cooled wall tube rows. Background technique [0002] The water-cooled wall is the main heating part of the boiler. It is composed of several rows of steel pipes and distributed around the boiler furnace. Its interior is flowing water or steam, and the outside receives the heat of the flame of the boiler furnace. Generally, the water-cooled wall is composed of multiple tubes. It is made of sub-welding, the original welding process will always have cracks at the weld seam, and the cracks will become larger and larger during operation or use, and repair welding is required, which not only wastes time, but also increase cost. Contents of the invention [0003] In order to solve the above problems, the present invention provides a welding process for T91 water-cooled wall pipe rows with good welding and no cracks. [0004] In order...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/18B23K9/02B23K9/235
Inventor 孔建忠
Owner JIANGSU GREENLEAVES BOILER
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