Process for welding corrugated inner container of boiler

A welding process and boiler technology, applied in welding medium, welding equipment, welding equipment and other directions, can solve the problems of cracks and safety hazards in welding interfaces, and achieve the effects of not easy cracks, high welding stability, and not easy cracks.

Active Publication Date: 2018-01-12
北京奥林匹亚锅炉有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The welding process of the boiler adopts the welding process method of submerged arc welding. In the actual use process, there may still be cracks in the welding interface after long-term use, which poses a great safety hazard.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A boiler corrugated liner welding process, comprising the following steps:

[0037] Step 1: Rolling: The steel plate is bent into a round tube with a rolling mill, and the seams are aligned;

[0038] Step 2: Pre-welding treatment: Grinding and derusting the welding joint of the boiler before welding, and polishing until it shows metallic luster;

[0039] Step 3: Solder Handling Operation

[0040] (1) Weld from the inner side of the pipe wall, the flux is SJ501, the welding wire specification is H08MnA, and the welding thickness is 2 / 3 of the pipe wall thickness;

[0041] (2) Use carbon arc gouging to process from the outside of the pipe wall to remove welding defects;

[0042] (3) Weld from the outside of the pipe wall, the flux is SJ101, the welding wire specification is H08MnA, and the welding thickness is 3 / 5 of the pipe wall thickness;

[0043] Step 4: Grinding treatment after welding: Use a grinding tool to smooth the welding surface.

Embodiment 2

[0045] A boiler corrugated liner welding process, comprising the following steps:

[0046] Step 1: Rolling: The steel plate is bent into a round tube with a rolling mill, and the seams are aligned;

[0047] Step 2: Pre-welding treatment: before welding, the welded joints of the boiler are ground and rust-removed until a metallic luster appears, and after the welded joints are polished, clean the welded joints with a cleaning agent;

[0048] Wherein the cleaning agent comprises the following components in parts by weight, 10 parts of hydrochloric acid, 10 parts of sodium citrate, 4 parts of fatty alcohol polyoxyethylene ether, 5 parts of ethanol, 4 parts of stearate, 4 parts of octylphenol polyoxyethylene ether 10 parts, 10 parts of disodium edetate, 10 parts of sodium benzoate, 10 parts of sodium dodecylbenzenesulfonate, 50 parts of water; the mass fraction of hydrochloric acid is 5%;

[0049] Step 3: Solder Handling Operation

[0050] (1) Preheat the welding joint before we...

Embodiment 3

[0056] A boiler corrugated liner welding process, comprising the following steps:

[0057] Step 1: Rolling: The steel plate is bent into a round tube with a rolling mill, and the seams are aligned;

[0058] Step 2: Pre-welding treatment: before welding, the welded joints of the boiler are ground and rust-removed until a metallic luster appears, and after the welded joints are polished, clean the welded joints with a cleaning agent;

[0059] Wherein the cleaning agent comprises the following components in parts by weight, 11 parts of hydrochloric acid, 11 parts of sodium citrate, 4 parts of fatty alcohol polyoxyethylene ether, 6 parts of ethanol, 4 parts of stearate, 4 parts of octylphenol polyoxyethylene ether 11 parts, 11 parts of disodium edetate, 11 parts of sodium benzoate, 11 parts of sodium dodecylbenzenesulfonate, 55 parts of water; the mass fraction of hydrochloric acid is 5%;

[0060] Step 3: Solder Handling Operation

[0061] (1) Preheat the welding joint before we...

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PUM

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Abstract

The invention discloses a process for welding a corrugated inner container of a boiler. The process comprises the procedures of rolling, pre-welding treatment, welding treatment operation, and post-welding grinding treatment. The welding treatment operation procedure comprises the following steps: welding from the inner side of a pipe wall; overcoming welding defects from the outer side of the pipe wall by utilization of carbon arc gouging; and welding from the outer side of the pipe wall. Through the two-layer welding operation, not only the high welding stability but also the fusion connection between different welding fluxes and the inner container are achieved, and the different welding fluxes are matched with welding wire so as to achieve the different degrees of stability; especially, an SJ501 welding flux is selected for an inner layer, an SJ101 welding flux is selected for an outer layer, and the two welding fluxes have the different properties of corrosion resistance and structure strength; and accordingly, when the two welding fluxes are utilized in the inner container welding process in a matched manner, the welding stability of a joint of the inner container is high, the cracking possibility is low, and the safety performance high.

Description

technical field [0001] The invention relates to the technical field of boiler welding, in particular to a boiler corrugated liner welding process. Background technique [0002] The boiler is often heated at high temperature. It is composed of several rows of steel pipes. The steel pipes are distributed around the boiler furnace. Cracks will always appear in the traditional welding process. The existence of cracks is largely due to the fact that in the current welding process, electrode arc welding, submerged arc welding, melting electrode gas shielded welding, plasma welding, electroslag welding, etc. are widely used. For boilers, pressure vessels and other full-penetration welded structures, the welded joints are designed according to equal strength. The weakening of the strength or insufficient toughness of the welded joints will lead to premature failure of the entire welded joints, and even cause serious catastrophic consequences. [0003] The Chinese patent with the pu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235B23K35/36B23K101/12
Inventor 申秀峰金敬烈许春立肖龙金永泽
Owner 北京奥林匹亚锅炉有限公司
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