A method of inspecting steel welding quality

A technology of welding quality and inspection method, which is applied in the direction of using radiation for material analysis, using sound waves/ultrasonic waves/infrasonic waves to analyze solids, etc. It can solve problems such as high product costs, uncoordinated process steps, and high requirements for employees' operating skills. arrange reasonable effects

Inactive Publication Date: 2016-06-08
重庆江东摩托车配件有限公司
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Problems solved by technology

[0002] The existing steel welding quality inspection methods have uncoordinated and unreasonable process steps, sometimes resulting in repeated or over-processing, which seriously affects product quality, and the scrap rate is high, requiring hi

Method used

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Embodiment Construction

[0015] The present invention will be further described below in conjunction with embodiment:

[0016] A method for checking the welding quality of steel, comprising the steps of:

[0017] 1) The type and size of welded joints shall comply with the relevant drawings and standards;

[0018] 2) All welds should be inspected externally to determine whether there are any following defects that are not allowed: burn-through, cracks, uneven height of scales, intermittent welds, exposed arc craters and depths exceeding 0.5mm, lengths exceeding welds 15% undercut of length;

[0019] 3) Important butt welds (such as the cover plate and web plate in the tension area of ​​the main girder of the crane) should be subjected to non-destructive testing. The radiographic testing should not be lower than the Ⅱ level specified in GB3323, and the ultrasonic testing should not be lower than JB1152. Class I specified;

[0020] 4) The location for X-ray film inspection shall be designated by the t...

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Abstract

A method of inspecting steel welding quality is disclosed. The method mainly comprises 1) a step of determining whether the type and the size of a welded joint meet regulations of related patterns and standards, 2) subjecting all weld seams to outer checking to determine whether unallowed defects comprising burning through, cracks, non-uniform scale heights, disconnected weld seams, exposure of craters, and undercuts the depth of which is more than 0.5 mm and the length of which is more than 15% of the length of weld seams exist or not, 3) subjecting important butt weld seams (such as cover plates and webs of a tension zone of a girder of a crane) to nondestructive inspection, with quality of the butt weld seams being not lower than quality specified in the II grade in the GB3323 during radiographic inspection, and quality of the butt weld seams being not lower than quality specified in the I grade in the JB1152 during ultrasonic inspection, and 4) designating a part to be subjected to X-ray shooting inspection through a technical department, if an unallowed defect is found through shooting, performing supplementary shooting at the extending direction or a questionable direction of the defect, and if doubt exits after the supplementary shooting, shooting the full part of each weld seam. The method can effectively reduce the reject rate and products are high in quality.

Description

technical field [0001] The invention relates to a method for checking the welding quality of steel materials. Background technique [0002] The existing steel welding quality inspection methods have uncoordinated and unreasonable process steps, sometimes resulting in repeated or over-processing, which seriously affects product quality, and the scrap rate is high, requiring high operating skills for employees, resulting in product failure. The cost is high. [0003] In addition, the existing steel welding quality inspection method has long process steps, and there are many unreasonable places in the allocation of each process. Contents of the invention [0004] In order to achieve the object of the present invention, the present invention provides a method for inspecting the welding quality of steel with reasonable and coordinated process arrangements. [0005] In order to solve the problems of the technologies described above, the present invention adopts the following t...

Claims

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Application Information

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IPC IPC(8): G01N23/04G01N29/04
Inventor 吴兆平
Owner 重庆江东摩托车配件有限公司
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