Method for improving corrosion resistance of stainless steel through welding process
A welding process, stainless steel technology, applied in welding equipment, plasma welding equipment, welding/welding/cutting items, etc., can solve the problems of difficult nitrogen content in stainless steel, difficult diffusion of nitrogen atoms, etc., achieve low cost and ensure arc stiffness , Improve the effect of corrosion resistance
Pending Publication Date: 2020-11-24
JIANGSU UNIV
View PDF7 Cites 0 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Nitrogen-containing stainless steel can significantly improve the corrosion resistance of stainless steel, but it is very difficult to increase the nitrogen content in stainless steel by means of steelmaking, and it is difficult for nitrogen atoms to diffuse into the steel
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 moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0021] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.
[0022] The invention discloses a method for improving the corrosion resistance of stainless steel through a welding process. The outer layer-middle layer-inner layer plasma arc welding torch feeds a gas with a specific distribution and a specific flow rate. The gas distribution form is: the outer layer is argon, the middle layer It is nitrogen, and the inner layer is argon. The flow rate of the gas is: the flow rate of argon gas in the outer layer is 20-25L / min, the flow rate of nitrogen gas in the middle layer is 0.2-5L / min, and the flow rate of argon gas in the inner layer is 0.5-6L / min; The flow rate should generally be less than the inner layer argon flow rate to ensure the arc stiffness of the inner layer argon gas.
[0023] During the welding process, the inner laye...
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
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
| yield strength | aaaaa | aaaaa |
Login to View More
Abstract
The invention provides a method for improving the corrosion resistance of stainless steel through a welding process. Gas is introduced into an outer layer-middle layer-inner layer plasma arc welding gun, the outer layer of the gas is argon, the middle layer of the gas is nitrogen, and the inner layer of the gas is argon. When the plasma arc welding gun welds a stainless steel weldment, the nitrogen on the middle layer is ionized through energy of a welding arc, nitrogen ions are generated, an nitrogen ion atmosphere and nitrogen ion partial pressure are formed, nitrogen elements are transitedinto a stainless steel molten pool in a nitrogen ion form under the high-temperature condition, and a nitrogen-containing stainless steel layer is formed. The nitrogen-containing stainless steel layercan be directly formed on the surface layer of the stainless steel, and the corrosion resistance of the stainless steel is improved.
Description
technical field [0001] The invention relates to a method for improving the corrosion resistance of stainless steel through a welding process. Background technique [0002] Industrial production and practice have proved that component failures caused by corrosion and wear account for about 70% of various electromechanical products worldwide. According to relevant statistics, the economic losses caused by corrosion in western developed countries alone account for 2% to 4% of the total economic value. Solving the corrosion failure of various components has always been one of the major problems in the engineering field. Although stainless steel has good corrosion resistance, corrosion is still the main problem leading to its failure when stainless steel components serve in acidic or seawater environments. For stainless steel designed to be welded, the corrosion resistance of the weld will generally decrease after welding. Nitrogen-containing stainless steel can significantly ...
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
Login to View More Patent Type & Authority Applications(China)
IPC IPC(8): B23K10/02B23K103/04
CPCB23K10/02B23K2103/05
Inventor 李天庆张宇王凯陈璐雷玉成
Owner JIANGSU UNIV