Dissimilar steel welding process of check door and tubing

A dissimilar steel and piping technology, applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve problems such as difficulty, affecting safe operation of pipelines, and no cracks, etc., so as to improve welding quality and reduce production and operation cost, and the effect of reducing the repair rate

Active Publication Date: 2013-09-11
NANTONG STATE ELECTRIC POWER VALVE
View PDF3 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is very difficult to weld two parts of different materials together, and the weld seam must not have defects such as cracks and leakage
As far as the check valve body of the present invention is made of dissimilar steel valve body (WC9) and piping (F91), in the current existing technology, welding these two different material parts is likely to cause the quality problems listed above, which will affect Normal and safe operation of the pipeline

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
  • Dissimilar steel welding process of check door and tubing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0021] In order to further introduce the present invention, introduce below in conjunction with description:

[0022] The welding process of the dissimilar steel of the check door piping, the welding process follows the following steps:

[0023] Step 1: Confirm that the material of valve body 1 is WC9 alloy steel;

[0024] Step 2: Confirm that the material of the piping 2 matched with the valve body 2 is F91 heat-resistant steel;

[0025] The third step: choose R40 welding wire and R407 welding rod, the diameter of the welding rod is Φ4mm, Φ5mm;

[0026] Step 4: Use a heating belt to preheat the workpiece, and the preheating temperature is 200 ° C ~ 250 ° C;

[0027] Step 5: Baking the electrode, the baking condition is 200℃-250℃×1h;

[0028] Step 5: Set the welding current as Φ4: 100 A~ 140A; Φ5: 140 A~ 180A;

[0029] Step 6: Connect valve body 1 and piping 2 by spot welding;

[0030] Step 7: Weld with R40 welding wire;

[0031] Step 8: Weld the surface with R407 weldi...

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
Login to view more

Abstract

The invention relates to a metal machining process, in particular to a dissimilar steel welding process of a check door and a tubing. The welding process comprises the following steps: confirming that a valve body is made of WC9 alloy steel, confirming that the tubing matched with the valve body is made of F91 heat resistant steel, selecting an R40 welding wire and an R407 welding rod, adopting a heating belt to preheat a workpiece, setting the current of a welding machine, connecting the valve body and the tubing in a spot welding mode, carrying out backing welding through the R40 welding wire, carrying out cap welding through the R407 welding rod, carrying out tempering and heat treatment through the heating belt after welding is carried out, and carrying out radiographic inspection on welded portions. The dissimilar steel welding process of the check door and the tubing has the advantages of improving the welding quality of the check door and the tubing effectively, guaranteeing safe operation of a pipeline, reducing the repair rate caused by quality problems, and accordingly reducing production and management cost.

Description

technical field [0001] The invention relates to a metal processing technology, in particular to a process step of welding dissimilar steel for a check door piping. Background technique [0002] The traditional check door is to control the reverse flow of the medium. In order to reduce energy consumption and improve power generation efficiency, power generation equipment is developing towards large-scale, high-parameter, and high-performance. The design of this project is to add a pipe at the inlet of the valve to save energy. Valves and pipes are generally connected by flange and welding. Here we mainly discuss the welding connection. It is very difficult to weld parts of two different materials together, and the weld seam must not have defects such as cracks and leakage. As far as the check valve body of the present invention is made of dissimilar steel valve body (WC9) and piping (F91), in the current existing technology, welding these two different material parts is ...

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): B23K31/02B23K103/18
Inventor 徐永明胡永祥郭玉林赵怀忠朱祥韩健莉
Owner NANTONG STATE ELECTRIC POWER VALVE
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