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Method for evaluating reheat crack sensitivity of coarse grained region of welding heat affected zone

A welding heat-affected zone and reheat crack technology, which is applied to welding equipment, metal processing equipment, manufacturing tools, etc., to achieve the effect of compensating for reheat crack sensitivity and simple test operation

Inactive Publication Date: 2019-05-14
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is a lack of a method that can be applied to engineering practice to effectively evaluate the susceptibility to reheat cracks in the coarse grained zone of the welded heat affected zone

Method used

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  • Method for evaluating reheat crack sensitivity of coarse grained region of welding heat affected zone
  • Method for evaluating reheat crack sensitivity of coarse grained region of welding heat affected zone
  • Method for evaluating reheat crack sensitivity of coarse grained region of welding heat affected zone

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Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0033] The welding current is 500A, and the welding heat input is 25.9kJ / cm.

[0034] The loading stresses are 590MPa, 565MPa and 540MPa respectively.

[0035] After simulated heat treatment, the cracking situation and critical stress are shown in Table 2

Embodiment 4-6

[0037] The welding current is 580A, and the welding heat input is 30.0kJ / cm.

[0038] The loading stresses are 540MPa, 515MPa and 490MPa respectively.

[0039] After simulated heat treatment, the cracking conditions and critical stress are shown in Table 2.

Embodiment 7-9

[0041] The welding current is 660A, and the welding heat input is 34.2kJ / cm.

[0042] The loading stresses are 490MPa, 465MPa and 440MPa respectively.

[0043] After simulated heat treatment, the cracking conditions and critical stress are shown in Table 2.

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Abstract

The invention relates to a method for evaluating reheat crack sensitivity of a coarse grained region of a welding heat affected zone. The method comprises the steps that firstly, different kinds of welding heat input are adopted for manufacturing a welding test plate; secondly, during C ring sampling, the arcing position and the tail end of the test plate need to be cut by at least 50 mm, and thesampling method has two schemes; thirdly, a bolt is used for applying stress to a C ring; fourthly, the test sample is put into a heating furnace to be subjected to simulated heat treatment; fifthly,whether reheat cracks are generated on the root of the gap of the C ring or not is observed; sixthly, critical stress under the different kinds of welding heat input is determined; and seventhly, in combination with the Gleeble hot simulation test, the index is evaluated, and the evaluation criteria of the gap C ring is set. The test operation is simple, the method can be applied and popularized in the actual engineering, and the condition that an existing evaluating method cannot evaluate the reheat crack sensitivity of the coarse grained region of the welding heat affected zone can be overcome.

Description

technical field [0001] The invention relates to the technical field of welding production, in particular to a method for evaluating the reheating crack sensitivity of the coarse-grained zone of the welding heat-affected zone. Background technique [0002] The hydrogenation reactor is in a high temperature, high pressure and hydrogen environment, and the production conditions of the equipment are extremely harsh. At present, the widely used hydrogenation reactor materials are mainly Cr-Mo steel and new Cr-Mo steel. The new Cr-Mo steel has good resistance to hydrogen corrosion and hydrogen embrittlement, good high-temperature service performance, and is widely used in the manufacture of hydrogenation reactors. However, due to the addition of strong carbide-forming elements such as V and Ti, the material is Welding performance is reduced, and the sensitivity of welded joints, especially the coarse-grained zone in the heat-affected zone, to reheat cracks is enhanced. After the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K31/12
Inventor 张莉王凯黄宇陈进
Owner EAST CHINA UNIV OF SCI & TECH
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