Special connector crack repair process method

A process method and cracking technology, applied in welding media, manufacturing tools, welding equipment, etc., can solve the problems of increased labor intensity, increased brittleness of welds, increased cutting volume, etc., achieving a wide range of applications, low welding costs, and labor. low intensity effect

Active Publication Date: 2014-12-17
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] 3. Repeated cutting along the cracks, so that the original cracks or crack sources continue to spread, the cutting volume is also increasing, and the labor intensity is increased
[0008] 5. When repairing, only matching welding consumables are selected, without considering the adjustment of alloy elements in the weld, so that harmful impurities such as C, N, H, P, S, etc. that penetrate into the base metal during operation will melt into the weld, making the weld Fracture brittleness increases, plasticity and toughness decrease
The cost of repairing this welding joint is as high as more than 20,000 yuan, and the final effect does not meet the requirements of use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: as figure 1 , figure 2 , image 3 As shown, a special joint crack repair process method includes the following steps,

[0021] Step 1. Carry out ray and coloring inspection on the cracked weld B, and accurately confirm the state of cracks existing inside and outside the weld;

[0022] Step 2. Perform performance restoration on C within 200mm on both sides of the cracked weld (heat treatment area), heat to 670-780°C within 200mm on both sides of the cracked weld, keep it warm for 2 hours and then cool slowly to room temperature for performance restoration. Gradually restore the structure and properties of the base metal after long-term continuous operation at high temperature in a special environment, reduce brittleness, and improve plasticity and toughness;

[0023] Step 3. Drill a Φ6-8mm crack stop hole E at a distance of 20mm from the end point of the crack D. The stress generated during crack cutting can be gradually released through the crack stop ...

Embodiment 2

[0030] Embodiment 2: as figure 1 , figure 2 , image 3 As shown, a special joint crack repair process is suitable for special materials, dissimilar materials, special equipment, and special pipelines that have been continuously operated at high temperature in a special environment for a long time or have multiple temperature fluctuations and changes in tissue composition, resulting in poor weldability and usability. Repair cracks in welded joints. Mainly through ray and coloring inspection; perform performance restoration within 200mm on both sides of the cracked weld; drill a crack stop hole at the end of the crack; completely remove the crack once and for all; ℃; adjust the alloy elements in the weld; change the stress distribution state when the crack is repaired by surfacing; perform post-heat treatment according to the material after welding; carry out multiple operation steps such as ray detection after 48 hours, and perform welding repair to prevent cracks Extension...

Embodiment 3

[0047] Taking the reformer tube of a methanol plant as an example, the material is nickel-based alloy Inconroy 800H, The main component of the conveyed medium is 80% hydrogen, and the normal operating temperature is 830°C. After about 30,000 hours of continuous operation, a crack with a length of 100 mm along the center of the welding seam at the interface between the cold wall pipe and the furnace pipe has occurred. In order to ensure the production, referring to relevant materials and combining practical experience, two methods are used to carry out on-site maintenance.

[0048] Problems existing in the existing special joint crack repair process:

[0049] The cracks are located and cut immediately, after cutting through, the grooves are ground, and the coloring test is carried out. It is found that the cracks still exist, and are more complex than the original cracks, and the length has also increased. Cut again, detect that the crack still exists again, and analyze it: ...

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Abstract

The invention provides a special connector crack repair process method, and belongs to the technical field of welding. Ray and coloring detection is conducted on a cracking welding joint. Performance restoring is conducted on the thermal processing area of the cracking welding joint. A cracking stopping hole is drilled close to an endpoint of the crack. The cutting range is widened, cracks are removed thoroughly at a time, and the crack cutting base material heat-affected zone is kept at a certain temperature. Grooves are machined, and coloring detection is conducted on the groove faces. Selected welding material can regulate alloy elements in the welding joint. Argon tungsten-arc welding is adopted, small-diameter welding wires are adopted, and the welding base material heat-affected zone is kept at a certain temperature. Multi-layer and multi-path build up welding is conducted on the groove faces. An arc pit is filled with normative collection arcs so that the arc pit can be prevented from cracks and other defects can be prevented, polishing and repairing are conducted on each connector so that the connectors can be well fused without causing defects, and connectors on all layers are staggered. A welding gun evenly swings so that it can be ensured that the groove openings in the two sides are well fused. The temperatures between the layers are controlled, and post thermal treatment is conducted on the repaired part according to the material after welding is conducted.

Description

technical field [0001] The invention relates to a special joint crack repair process and belongs to the field of welding technology. Background technique [0002] Oil refining and chemical equipment have high temperature, high pressure, flammable, explosive, toxic and harmful production characteristics. Special materials, heterogeneous materials, special equipment and special pipelines can be seen everywhere. After long-term continuous operation at high temperature in a special environment, C, N, H Harmful impurities such as , P, and S continuously infiltrate into the metal, the composition of the structure changes greatly, the manufacturability and usability deteriorate, and after repeated temperature fluctuations, cracks often occur in welded joints with concentrated stress during operation. Using the original repair process to repair sometimes cracks spread, sometimes the repaired parts crack repeatedly, and some new cracks are generated after short-term operation, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/00B23K9/235
CPCB23K9/04B23K9/167B23K9/235B23K35/0261B23K35/304
Inventor 杨永磊刘海滨淡明昌曾传刚洪晓煜夏永胜段强李海强李艳
Owner PETROCHINA CO LTD
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