Welding method for improving performance of stainless steel single-layer surfacing corrosion-resistant layer

A welding method and technology for a corrosion-resistant layer are applied in the welding field to improve the performance of the corrosion-resistant layer of stainless steel single-layer surfacing, which can solve the problems of reducing the performance of joints, increasing the production cost, affecting the production cycle, etc., and achieving high construction efficiency and construction. The effect of stable quality and convenient operation

Active Publication Date: 2022-03-25
HEFEI GENERAL MACHINERY RES INST +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Multi-layer surfacing welding is prone to more welding defects such as slag inclusions, pores, and poor dimensions, which seriously reduces the performance of the joints
Moreover, welding defects need to be repaired repeatedly to meet the design requirements, which seriously affects the production cycle and increases production costs.

Method used

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  • Welding method for improving performance of stainless steel single-layer surfacing corrosion-resistant layer
  • Welding method for improving performance of stainless steel single-layer surfacing corrosion-resistant layer
  • Welding method for improving performance of stainless steel single-layer surfacing corrosion-resistant layer

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Experimental program
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Effect test

Embodiment 1

[0037] This embodiment provides a welding method for improving the performance of the stainless steel corrosion-resistant layer, comprising the steps of:

[0038] S1. First clean up the oil, rust, scale, etc. on the surface of the substrate steel plate Q370R to be surfacing, and then fix the surfacing workpiece after passing 100% magnetic particle testing, with the surfacing surface facing upwards and keeping it level;

[0039] S2. Use semi-automatic CO 2 Gas shielded welding equipment, in pure CO 2 Use 309LMo welding wire in the gas to perform single-layer surfacing on the surface to be surfacing. The welding machine model is Shandong Aotai NBC-500 inverter CO 2 Gas shielded welding machine, welding process parameters are as follows:

[0040] The welding current is 220A, the arc voltage is 28V, the welding speed is 230mm / min, the dry elongation is 24mm, the preheating temperature is 120°C, the interlayer temperature is 100°C, the type and polarity of the power supply are DC...

Embodiment 2

[0054] This embodiment provides a welding method for improving the performance of the stainless steel corrosion-resistant layer, comprising the steps of:

[0055] S1. First clean up the oil, rust, scale, etc. on the surface of the substrate steel plate Q370R to be surfacing, and then fix the surfacing workpiece after passing 100% magnetic particle testing, with the surfacing surface facing upwards and keeping it level;

[0056] S2. Use semi-automatic CO 2 Gas shielded welding equipment, in pure CO 2 Use 309LMo welding wire in the gas to perform single-layer surfacing on the surface to be surfacing. The welding machine model is Shandong Aotai NBC-500 inverter CO 2 Gas shielded welding machine, welding process parameters are as follows:

[0057] The welding current is 230A, the arc voltage is 30V, the welding speed is 230mm / min, the dry elongation is 24mm, the preheating temperature is 120°C, the interlayer temperature is 150°C, the power supply type and polarity are DC revers...

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Abstract

The invention provides a welding method for improving the performance of a stainless steel single-layer surfacing corrosion-resistant layer. According to the method, CO2 gas shielded welding is adopted, a flux-cored wire is used for corrosion-resistant layer single-layer surfacing welding, the welding bead overlap amount is controlled to be 2-3 mm, transition layer surfacing welding is not needed, and by controlling welding process parameters such as welding current, arc voltage, welding speed, dry extension length, preheating temperature, interlayer temperature, protective gas, gas flow and welding line energy, compared with common single-layer surfacing welding, the welding efficiency is greatly improved. On the premise that the comprehensive performance of the surfacing layer is guaranteed, the construction efficiency is effectively improved, and the method has the advantages of being convenient to operate, high in construction efficiency and stable in construction quality. The corrosion-resistant layer formed by the method is good in comprehensive mechanical property, and particularly excellent in corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of welding. In particular, it relates to a welding method for improving the performance of a stainless steel single-layer surfacing corrosion-resistant layer. Background technique [0002] Most of the large-scale pressure vessel equipment operates in complex and harsh working environments such as high temperature, high pressure, and strong corrosion, and the failure phenomena such as corrosion and fatigue are relatively serious. Austenitic stainless steel, as a high-performance material with high ductility and plasticity and excellent manufacturability, is widely used in the manufacturing process of large pressure vessel equipment. But if you only use austenitic stainless steel to make parts, the cost is very high. Therefore, in order to reduce production costs and ensure that parts meet the design and use requirements, austenitic stainless steel is usually surfacing on low alloy steel. [0003] Large-are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/04
CPCB23K9/16B23K9/04
Inventor 蒋军陈崇刚繆平涂少斌王利房务农
Owner HEFEI GENERAL MACHINERY RES INST
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