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Welding process of bellows

A welding process and corrugated pipe technology, applied in the field of corrugated pipe welding process, can solve problems such as hidden dangers in stability and safety, limited application, unsatisfactory high-temperature mechanical properties of welding seams, etc., and achieve excellent synergistic function and good surface shape appearance, excellent abnormal temperature and high temperature mechanical properties

Inactive Publication Date: 2019-03-01
JIANGSU FENGHE MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the application, it is found that ERNiCr-3 is still insufficient as a nickel-based welding material, and the outstanding performance is that the high-temperature mechanical properties of the weld are not ideal.
This defect makes the stability and safety of the product in high-temperature application environment hidden dangers, thus limiting the application of the product in certain high-temperature environments that require mechanical properties

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A welding process for bellows, comprising the following steps:

[0030] Step 1: welding characteristic research;

[0031] Step 2: Formulate welding material and welding process;

[0032] Step three: welding;

[0033] Step 4: quality control, described quality control comprises technical work, process control and quality inspection and acceptance.

[0034] Further, the research on welding characteristics is a research on the chemical composition and mechanical properties of 07MnMoVR high-strength steel.

[0035] Further, the Mn content of the 07MnMoVR high-strength steel is 1.2%-1.6%, and the tensile strength reaches 630-730 MPa.

[0036] Further, the welding process is electrode arc welding and / or argon tungsten arc welding and / or submerged arc welding.

[0037] Further, the longitudinal seam bevel of the welding process is a 1 / 3 asymmetrical X shape without blunt edges, the bevel angle is 60°, processed by 12 planer machines, and the circular seam bevel is a symmet...

Embodiment 2

[0041] For the research on product welding characteristics, according to the analysis of the chemical composition table and mechanical performance table of 07MnMoVR high-strength steel:

[0042] 07MnMoVR high-strength steel chemical composition and mechanical properties table

[0043]

[0044] The Mn content of 07MnMoVR high-strength steel is relatively high, about 1.2% to 1.6%, and the quenched and tempered high-strength plate for pressure vessels with very low C and S content has a tensile strength of 630-730Mpa. Reducing the C content improves the weldability of 07MnMoVR high-strength steel.

[0045] Therefore, there are usually two problems in the weldability of 07MnMoVR high-strength steel:

[0046] (1) Various welding defects caused by welding are mainly various crack problems. The cracks generally produced during welding of 07MnMoVR are welding hot cracks and welding delay cracks.

[0047] (2) Changes in material properties during welding: mainly due to changes in...

Embodiment 3

[0109] A welding material, which is composed of the following chemical components in terms of mass percentage: C ≤ 0.5%, Cr 16.0-18.0%, Fe 6.0-10.0%, Mn ≤ 1.0%, Nb 1.5-3.0%, Si 0.6 ~1.0%, S≤0.015%, P≤0.015%, Ni≥70.0%, k≤0.015%.

[0110] Further, the welding material is composed of the following chemical composition by mass percentage: C 0.3%, Cr16.8%, Fe 7.2%, Mn 0.4%, Nb 2.45%, Si 0.85%, S0.002%, P 0.002 %, K 0.002%, Ni balance.

[0111] Further, the welding process adopted when welding with welding material is selected from MIG arc welding, non-MIG arc welding or automatic welding, preferably non-MIG arc welding process.

[0112] The connection mode between the welding machine and the welding sample is direct current connection. The welding process includes the following steps:

[0113] (1) Clean the groove surface of the sample to be welded, keep it clean and dry, then connect the groove according to the above-mentioned V-shaped butt joint method, fix the position by spo...

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Abstract

The invention provides a welding process of a bellows. The welding process of the bellows is characterized by comprising the following steps that step 1, welding characteristic research is carried out; step 2, a welding material and a welding process are formulated; step 3, welding is carried out; and step 4, quality control is carried out, wherein the quality control includes technology work, process control and quality inspection and acceptance.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a welding process for bellows. Background technique [0002] The cost of expansion joints is not much in the total investment of the project, but the reliability and safety of its quality are directly related to the safe operation of power generation, and its manufacturing quality should be highly valued. The product structure of the compound expansion joint is complex, the body is heavy, the caliber is large, and the displacement in the three directions is relatively large in the same type of project. Therefore, it is necessary to ensure the safety and reliability of the product performance and indicators. The safety factor, as well as the dimensional accuracy of the various parts assembled on site, and the process and welding methods used in the on-site welding should also be considered to ensure that the inspection and hydraulic pressure once the assembly is completed are qua...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/167B23K9/173B23K9/18B23K35/30
CPCB23K9/16B23K9/167B23K9/173B23K9/18B23K35/3033
Inventor 吉远宏刘明安张丽吉远东杨磊
Owner JIANGSU FENGHE MACHINERY MFG
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