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

Welded titanium pipe and welded titanium pipe manufacturing method

A manufacturing method and technology for titanium welded pipes, applied in the direction of manufacturing tools, pipes/pipe joints/fittings, welding/welding/cutting items, etc., which can solve problems such as obstruction and undetectable

Inactive Publication Date: 2016-10-26
KOBE STEEL LTD
View PDF8 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] However, as described above, protrusions or grooves are processed on the outer surface or inner surface of the heat transfer tube, and these protrusions or grooves may hinder the detection of defects (damages) remaining on the surface of the heat transfer tube.
For example, when using an eddy current flaw detector to detect defects remaining on the surface, the deep groove structure (concavity and convexity) formed on the surface of the heat transfer tube is detected as noise, and the defects remaining on the surface of the tube are hidden in the This noise may not be detectable

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
  • Welded titanium pipe and welded titanium pipe manufacturing method
  • Welded titanium pipe and welded titanium pipe manufacturing method
  • Welded titanium pipe and welded titanium pipe manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

experiment example

[0052] Next, the advantage of the dimensions of the protrusions 2 of the titanium welded pipe 1 and the concavo-convex structure including the protrusions 2 described above will be described in detail based on experiments and results thereof.

[0053] For such as Figure 4 The illustrated titanium welded pipe 1 having a surface having a surface defect (damage) 4 was subjected to an eddy current flaw detection test for detecting the defect 4 thereof. The results are shown in Table 1. Table 1 shows the average maximum height Ha of the convex portion and the ratio Pmax / Pa of Examples 1 to 4 and Comparative Examples 1 to 5, and the results of whether or not damage can be detected by the eddy current testing. In addition, Table 2 shows the results of experiments on the evaporation heat transfer performance of the titanium welded pipes 1 of Examples 1 to 4 and Comparative Example 4. and, Figure 5 Represents the inspection data obtained by carrying out the eddy current flaw detec...

Embodiment 2

[0067] In the titanium welded pipe 1 of Example 2, the average maximum height of the protrusions Ha was 16.1 μm, and Pmax / Pa was 1.17. For the titanium welded pipe 1 of Example 2, damage imparted to the surface could be detected by an eddy current flaw detection test. That is, the protrusion 2 of the titanium welded pipe 1 of Example 2 was not detected as noise in the eddy current flaw detection test.

Embodiment 3

[0068] In the titanium welded pipe 1 of Example 3, the average maximum height of the protrusions Ha was 18.0 μm, and Pmax / Pa was 1.24. For the titanium welded pipe 1 of Example 3, damage imparted to the surface could be detected by an eddy current flaw detection test. That is, the protrusion 2 of the titanium welded pipe 1 of Example 3 was not detected as noise in the eddy current flaw detection test.

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
areaaaaaaaaaaa
heightaaaaaaaaaa
heightaaaaaaaaaa
Login to View More

Abstract

A welded titanium pipe (1) which enables improving heat conductivity and detecting surface defects, and a manufacturing method thereof are provided. This welded titanium pipe (1) is made by forming a titanium plate into a tubular shape and welding the edges thereof together. On the outer and / or inner peripheral surface of the welded titanium pipe (1), an uneven pattern is formed having a base surface (3) and multiple protrusions (2). The protrusions have an average maximum height of 12-45[mu]m. The ratio of the maximum value to the average value of the pitch of the protrusions (2) is less than 2, the ratio of the average of the maximum dimension of the protrusions (2) to the average value of the pitch is 0.90 or less, and the ratio of the average maximum height to the thickness is 0.11 or less.

Description

technical field [0001] The present invention relates to a titanium welded pipe used for a heat transfer pipe of a heat exchanger and a method for manufacturing the titanium welded pipe. Background technique [0002] Generally, in a seawater desalination plant or an LNG (Liquefied Natural Gas) vaporizer, a heat exchanger including heat transfer tubes is used. The heat transfer tube is constituted by, for example, a welded tube in which protrusions, grooves, and other irregularities are provided on the outer surface or the inner surface. The welded pipe is obtained by processing a metal flat plate with protrusions such as protrusions formed on the surface into a tubular shape and welding the ends thereof, allowing fluid to circulate inside the welded pipe, and promoting the flow of the fluid and the substance outside the welded pipe. heat exchange between them. [0003] On the other hand, in order to achieve high performance and downsizing of seawater desalination equipment ...

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): F16L9/02B21D51/18B21D53/06B23K9/23F28F1/12F28F21/08
CPCB21D53/06B23K9/23F16L9/165B23K9/167B21C37/08B21C37/158F28F21/086F28D2021/0064B23K2101/06B23K2103/14F28F1/124F16L9/02F28F2210/10F28F2275/06
Inventor 田村圭太郎藤井康之逸见义男大山英人
Owner KOBE STEEL LTD