Flange resurfacing welding method

A flange and surfacing technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve the problems of high price of corrosion-resistant alloys, waste of materials, increase production costs, etc., and achieve difficult quality control, low efficiency, The effect of improving efficiency

Inactive Publication Date: 2010-02-10
上海锐迈重工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the past, the usual practice was to use high-corrosion-resistant alloys (CRA) to manufacture flanges. Although this has a certain anti-corrosion effect, the corrosion-resistant alloys are expensive, which not only greatly increases production costs, but also largely causes material damage. a lot of waste

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  • Flange resurfacing welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Such as figure 1 As shown, it is a schematic diagram of the flange after surfacing. The material of the flange body 1 is A350 LF2, and the corrosion-resistant alloy layer 2 is surfacing on the inner hole wall and sealing surface, and the material is nickel alloy ERNiCrMo-3 (Inconel 625).

[0014] The flange surfacing method is as follows:

[0015] Step 1: Roughly process the surface of the flange, and reserve a machining allowance of 3mm to ensure that the weld layer can meet the specified size requirements after processing; The above-mentioned defects need to be repaired and removed by welding, and then surfacing can be done after rough turning; dry the electrode, and use acetone to remove the rust, oil and oxides on the surface of the electrode;

[0016] Step 2: Preheat the surface of the flange to 75°C with an oxyacetylene flame, the preheating time is 0.5h, and the interlayer temperature is 150°C;

[0017] The third step: use tungsten argon arc welding to weld the...

Embodiment 2

[0020] Such as figure 1 As shown, it is a schematic diagram of the flange after surfacing. The material of the flange body 1 is A350 LF2, and the corrosion-resistant alloy layer 2 is surfacing on the inner hole wall and sealing surface, and the material is nickel alloy ERNiCrMo-3 (Inconel 625).

[0021] The flange surfacing method is as follows:

[0022] Step 1: Roughly process the surface of the flange, and reserve a machining allowance of 5mm to ensure that the weld layer can meet the specified size requirements after processing; The above-mentioned defects need to be repaired and removed by welding, and then surfacing can be done after rough turning; the electrodes are dried, and then the butanone (model: Q / GHSA-233-1999) produced by Shanghai Reagent No. 1 Factory is used to remove the rust, oil stains and oxide;

[0023] Step 2: Preheat the surface of the flange to 150°C with an oxyacetylene flame, the preheating time is 1h, and the interlayer temperature is 250°C;

[0...

Embodiment 3

[0027] Such as figure 1 As shown, it is a schematic diagram of the flange after surfacing. The material of the flange body 1 is AISI 4130, and the corrosion-resistant alloy layer 2 is surfacing on the inner hole wall and sealing surface, and the material is nickel alloy ERNiCrMo-3 (Inconel 625).

[0028] The flange surfacing method is as follows:

[0029] Step 1: Roughly process the surface of the flange, and reserve a machining allowance of 3mm to ensure that the weld layer can meet the specified size requirements after processing; The above-mentioned defects need to be repaired and removed by welding, and then surfacing can be done after rough turning; the electrodes are dried, and then the butanone (model: Q / GHSA-233-1999) produced by Shanghai Reagent No. 1 Factory is used to remove the rust, oil stains and oxide;

[0030] Step 2: Preheat the surface of the flange to 150°C with an oxyacetylene flame, the preheating time is 0.5h, and the interlayer temperature is 200°C;

...

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Abstract

The invention provides a flange resurfacing welding method which is characterized in that the method comprises the following specific steps: step 1. performing rough machining to the surface of flanges while reserving working allowance, drying welding rods, removing iron rust, greasy dirt and oxide on the surface of welding rods; step 2. using an electrothermal equipment to preheat the surface offlanges, step 3. adopting argon tungsten-arc welding method for the overlaying of flanges under conditions that the protective gas is argon gas with the purity of 99.99%, the flow of the protective gas is 15-20L/Min, the current adopts direct current electrode negative polarity, the current value is 150-200A, the voltage value is 12-15V, the welding speed is 140-220mm/Min, the wire feed rate is 1600-2000mm/Min, and step 4. annealing the flanges after overlaying at 610-720 DEG for 2.5-4h. The invention has the advantage that compared with ordinary flange overlaying, the process of the inventionhas high overlaying efficiency, stable quality control and low dilution rate, thus the corrosion resistance is greatly improved.

Description

technical field [0001] The invention relates to an inner hole and sealing surface surfacing welding method of carbon steel, alloy steel and stainless steel flanges, which is mainly used for anti-corrosion control of flanges in transmission pipelines containing corrosive media in chemical industries such as petroleum and natural gas, and belongs to the technical field of anti-corrosion technology . Background technique [0002] As a special equipment for material transportation, pipelines are widely used in machinery, petroleum, chemical industry, metallurgy and other industries, and play an important role in modern industrial production and people's lives. Flanges are the most widely used sealing components in pipeline systems. , is critical to the safe operation of the entire pipeline system. The flange is a detachable connection, its function is to compress the sealing gasket with the help of connecting bolts, so that the gasket undergoes elastic or plastic deformation un...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/04B23K9/16B23K9/235B23K9/095
Inventor 饶建红张政
Owner 上海锐迈重工有限公司
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