Welding method for P355NH and 18MnD5 dissimilar steel

A welding method and dissimilar steel technology, applied in welding equipment, arc welding equipment, manufacturing tools, etc., can solve problems such as brittle fracture and welding cracks, and achieve the effects of reducing crack tendency, slowing down tissue stress, and accurate temperature changes

Inactive Publication Date: 2017-12-22
CHINA NUCLEAR IND 23 CONSTR
View PDF12 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that welding cracks and brittle fractures are prone to occur in the welded joint area of ​​the two when welding P355NH and 18MnD5, the invention proposes a welding method for P355NH and 18MnD5 dissimilar steels

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
  • Welding method for P355NH and 18MnD5 dissimilar steel
  • Welding method for P355NH and 18MnD5 dissimilar steel
  • Welding method for P355NH and 18MnD5 dissimilar steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1, a section of P355NH steel and a section of 18MnD5 steel base material are taken. First, the welding parts of the two sections of P355NH and 18MnD5 dissimilar steel base materials to be welded are processed into a 20° U-shaped groove, and the surface of the groove and its surrounding area are cleaned to avoid the existence of impurities and pollutants. The P355NH and 18MnD5 dissimilar steel base materials that have completed the groove processing are combined, and the gap between the groups is controlled between 1 and 4mm. Then, the P355NH and 18MnD5 dissimilar steel base materials that have completed the groove processing were preheated before welding by means of electric heating, and the preheating temperature was controlled at 140 ° C by means of a far-infrared thermometer. Then, according to the welding parameters in Table 1, the base metals of P355NH and 18MnD5 dissimilar steels were welded in sequence for the base layer, the filler layer, and the cover l...

Embodiment 2

[0040] Embodiment 2, adopt the welding method identical with embodiment 1 to carry out welding operation to P355NH and 18MnD5 dissimilar steel base material, its difference is: embodiment 2 adopts the welding parameter in table 2 to carry out welding operation to P355NH and 18MnD5 dissimilar steel base material At the same time, in the post-weld heat treatment, in the first stage, the temperature of the welded joint is freely raised to 350°C; in the second stage, the welded joint is heated to 620°C at a heating rate of 200°C / h, and kept at 620°C for 2 hours ; In the third stage, the welded joint was cooled to 350°C at a cooling rate of 200°C / h; in the fourth stage, the welded joint was freely cooled to room temperature to obtain the welded product X2.

[0041] Table 2

[0042]

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

PropertyMeasurementUnit
diameteraaaaaaaaaa
diameteraaaaaaaaaa
Login to view more

Abstract

The invention belongs to the technical field of welding of dissimilar steel, particularly relates to a welding method for P355NH and 18MnD5 dissimilar steel, and discloses a welding method for P355NH and 18MnD5 dissimilar steel in order to solve the problem that welding cracks and brittle fracture are likely to be produced in a welding joint area of P355NH and 18MnD5 when the P355NH and the 18MnD5 are welded. The method comprises the steps that 1, edge preparation and welding assembling are carried out on P355NH and 18MnD5 dissimilar steel base metal to be welded; 2, preweld preheat treatment is carried out on the P355NH and 18MnD5 dissimilar steel base metal to be welded; 3, multi-layer welding operation is carried out on the P355NH and 18MnD5 dissimilar steel base metal, wherein the multi-layer welding operation sequentially comprises base coat welding, filling layer welding and cover face layer welding; and 4, a P355NH and 18MnD5 dissimilar steel welding joint obtained after welding is subjected to postweld heat treatment. In the welding method, the parameters in the welding operation process are selected and controlled, so that welding for P355NH and 18MnD5 dissimilar steel is completed, and the welding joint with the excellent welding performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of dissimilar steel welding, in particular to a welding method for P355NH and 18MnD5 dissimilar steel. Background technique [0002] P355NH belongs to the fine-grained steel with a minimum yield strength of 355Mp. The steel has a low carbon content, a small tendency to harden, and a small tendency to thermal cracking during welding. It has high thermal cracking resistance and good welding performance. In the EPR reactor type nuclear power project, it is mainly used to make various piping equipment in the main steam system and the main water supply system. 18MnD5 belongs to tempered steel, which has low carbon content and high manganese content, and the control of P and S content is also strict, so its hot crack tendency is also small. In EPR reactor type nuclear power projects, it is mainly used to make equipment such as nozzles, voltage stabilizers, pressure vessel cylinders, heads and supporting componen...

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
Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/167B23K9/23B23K9/235
CPCB23K9/0026B23K9/167B23K9/232B23K9/235
Inventor 刘晓多李凯
Owner CHINA NUCLEAR IND 23 CONSTR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap