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Postweld heat treatment quality examination method

A post-weld heat treatment and quality inspection technology, applied in the direction of testing the hardness of materials, can solve the problems of high production cost, many processes, and high operator experience requirements, and achieve the effect of low manufacturing cost and reasonable process.

Inactive Publication Date: 2016-10-05
重庆沁煌实业有限公司
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Problems solved by technology

[0002] The existing post-weld heat treatment quality inspection methods have unreasonable process arrangements, numerous processes, and high requirements for operator experience, resulting in high production costs

Method used

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Embodiment Construction

[0013] The present invention will be further described below in conjunction with embodiment:

[0014] A post-weld heat treatment quality inspection method, comprising the steps of:

[0015] (1) After the heat treatment of the welded joint, if it is confirmed that there is no abnormality in the automatic recording curve, one point can be taken from the weld and the heat-affected zone to test the hardness value, and the random inspection rate can be carried out according to the design regulations;

[0016] (2) The hardness value of the weld seam after heat treatment generally does not exceed the low hardness HB+100 of the base material cloth, and does not exceed the following regulations:

[0017] Total alloy content<3% HB≤270

[0018] Total alloy content 3%~10% HB≤300

[0019] Total alloy content>10% HB≤350

[0020] (3) When the hardness value of the weld exceeds the specified range, re-inspection should be doubled according to the shift, and the reason should be found out, ...

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Abstract

The invention discloses a postweld heat treatment quality examination method. The method comprises the following steps: 1) after heat treatment of a welded joint, if no abnormity is generated on automatic recorded curves, the test hardness value can be taken at the welded seam and the heat influence zones, the sampling observation rate can be carried out according to the design regulation; 2) hardness number of the heat treatment welded seam generally does not exceed low hardness of HB+100 of a parent metal and should be followed with the following regulations: the total content of the alloy is less than 3%, HB is less than or equal to 270; the total content of the alloy is 3%-10%, HB is less than or equal to 300; and the total content of the alloy is greater than 10%, HB is less than or equal to 350; and 3) when the hardness number of the welded seam exceeds a prescribed range, double re-inspection can be carried out, the reason is found out, and the heat treatment and hardness test of the unqualified welded seam are carried out. The examination method has the advantages of reasonable process and low manufacture cost.

Description

technical field [0001] The invention relates to a method for inspecting the quality of heat treatment after welding. Background technique [0002] The existing post-weld heat treatment quality inspection methods have unreasonable process arrangements, numerous processes, and high requirements for operator experience, resulting in high production costs. Contents of the invention [0003] In view of the above-mentioned defects in the prior art, the technical problem to be solved by the present invention is to provide a quality inspection method for post-weld heat treatment with reasonable process and low manufacturing cost. [0004] To achieve the above object, the present invention provides [0005] A post-weld heat treatment quality inspection method, comprising the steps of: [0006] (1) After the heat treatment of the welded joint, if it is confirmed that there is no abnormality in the automatic recording curve, one point can be taken from the weld and the heat-affecte...

Claims

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Application Information

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IPC IPC(8): G01N3/40
Inventor 赵伟
Owner 重庆沁煌实业有限公司
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