Unlock instant, AI-driven research and patent intelligence for your innovation.

Corrosion agent for displaying low-alloy and high-strength-steel welding heat affected zone partitions and method

A technology of welding heat effect and corrosive agent, which is applied in the preparation of test samples, etc., can solve problems such as failure, fracture and corrosion of nuclear facilities components, and achieve the effect of easy measurement and accurate geometric size arrangement.

Active Publication Date: 2016-11-09
中船双瑞(洛阳)特种装备股份有限公司
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method can only corrode the penetration depth of the weld and the outer edge of the welding heat-affected zone when corroding the welding heat-affected zone of low-alloy steel, and cannot obviously corrode the coarse-grained zone, fine-grained zone and The edge of the critical coarse-grained zone; even on the corrosion of the penetration depth and the edge of the welding heat-affected zone, the above-mentioned corrosive agents will only have ideal effects on specific high-strength steel grades
[0004] In recent years, with the strong development of domestic nuclear power, nuclear power generation is gradually becoming the main way of domestic power supply, but the components of nuclear facilities have been subjected to problems such as high temperature, high pressure and neutron irradiation for a long time during their service, which leads to failure of nuclear facility components fracture

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Corrosion agent for displaying low-alloy and high-strength-steel welding heat affected zone partitions and method
  • Corrosion agent for displaying low-alloy and high-strength-steel welding heat affected zone partitions and method
  • Corrosion agent for displaying low-alloy and high-strength-steel welding heat affected zone partitions and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The argon arc welding joint of SA508-3 steel is immersed in FeCl with a mass percentage of 5% at a temperature of 50°C 3 In the process, the surface to be corroded should be immersed evenly, and at the same time avoid contact with the container, and take it out when the surface is gray and dark; rinse the sample with absolute ethanol, and dry it evenly with a hair dryer; immerse the sample after drying The volume fraction is 2% nitric acid, 1% hydrofluoric acid, and the rest is HNO of absolute ethanol 3 -HF-C 2 h 5 After corroding in OH solution for 30s, rinse with absolute ethanol and then dry with a hair dryer.

Embodiment 2

[0031] The argon arc welding joint of WELDOX960E steel was immersed in FeCl with a mass percentage of 6% at a temperature of 50 °C 3 In the medium, the surface to be corroded should be immersed evenly, and at the same time avoid contact with the container, and take it out when the surface is gray and dark; rinse the sample with absolute ethanol, and dry it evenly with a hair dryer; immerse the sample after drying HNO with a fraction of 2.5% nitric acid, 1% hydrofluoric acid and the rest absolute ethanol 3 -HF-C 2 h 5 After corroding in OH solution for 30s, rinse with absolute ethanol and then dry with a hair dryer.

Embodiment 3

[0033] The argon arc welding joint of SA508-3 steel is immersed in FeCl with a mass percentage of 8% at a temperature of 45°C 3 In the process, the surface to be corroded should be immersed evenly, and at the same time avoid contact with the container, and take it out when the surface is gray and dark; rinse the sample with absolute ethanol, and dry it evenly with a hair dryer; immerse the sample after drying The volume fraction is 2% nitric acid, 0.5% hydrofluoric acid, and the rest is HNO of absolute ethanol 3 -HF-C 2 h 5 After corroding in OH solution for 35s, rinse with absolute ethanol and then dry with a hair dryer.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a corrosion agent for displaying low-alloy and high-strength-steel welding heat affected zone partitions and a method. The corrosion agent comprises a component A for corrosion in a step 1, and a component B for corrosion in a step 2; the component A is FeCl3 solution with a mass fraction of 5-8%; the component B consists of the following components in percentage by volume: 2-2.5% of nitric acid, 0.5-1.5% of hydrofluoric acid, and the balance of anhydrous ethanol; after the component A of the corrosion agent is firstly used for corrosion and cleaning, the component B of the corrosion agent is used for corrosion, that is, the two-step combined corrosion is performed; and the macroscopic metallography of each partition of a corrosion welding heat affected zone can be displayed. The corrosion agent and the corrosion method can obviously display the partition boundaries of the welding heat affected zone, are convenient for size measurement of the welding heat affected zone, accurately perform geometric size arrangement of welding ways, and realize a tempering welding way technology.

Description

technical field [0001] The invention relates to the technical field of welding repair, in particular to a corrosive agent and a method for displaying the welding heat-affected zone of low-alloy high-strength steel. Background technique [0002] During the welding process, due to the distribution state of the welding heat source, different regions of the base metal experience different welding heat cycles, resulting in different organizational states. For low-alloy steel, according to the differences in the structure and properties of the welding heat-affected zone, the welding heat-affected zone is mainly divided into a coarse-grained zone, a fine-grained zone, and a critical zone. When repairing low-alloy steel pressure vessels and equipment with tempering bead welding, the corrosion and size measurement of each zone in the welding heat-affected zone is the premise and key to the implementation of tempering bead technology. [0003] Usually, the corrosion of the heat-affec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C23F1/28C23F1/14G01N1/32
CPCC23F1/14C23F1/28G01N1/32
Inventor 秦建
Owner 中船双瑞(洛阳)特种装备股份有限公司