Logbook for recording work and recording the results of visual and measurement control. Technology of visual measurement methods for testing welds A simple optical method for confirming the quality of metal welding
Based on the results of the VIC, a journal of work and registration of the VIC and the VIC Act are drawn up.
“Act of visual and/or measuring control”
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ACT N ___ from _______ visual and measuring control | |||||||||||||
1. In accordance with the work order (application) |
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| type of control | ||||||||||
| control |
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(visual, measuring) |
| name and dimensions of the controlled object, | |||||||||||
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code of documentation, specifications, drawing, batch, number of control object | |||||||||||||
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The control was carried out according to |
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| name and/or code technical documentation | ||||||||||||
2. During inspection, the following defects were revealed |
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| characteristics of defects | ||||||||||||
dimensions, location and/or orientation for specific objects) | |||||||||||||
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3. Conclusion on the results of the VIC |
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Control completed |
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Qualification level, qualification no. certificates | Full name, signature | ||||||||||||
Head of work on VIC |
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| Full name, signature |
- name and type (type) of the controlled object, its number;
- location and, if necessary, dimensions of controlled areas at the control object;
- control conditions;
- production control document, its number;
- method of measurement control and used devices (tools);
- brand of material and batch number of the control object, as well as the designation of the standard or specifications for the material;
- main characteristics of identified defects;
- name or code of the RD for which the quality assessment was performed;
- assessment of control results;
- control date.
Explanations for the registration of the “Act of visual and/or measurement control”
1. Clause 1 indicates the type of control - visual, measuring or VIC, as well as the name of the controlled object, as well as the name and/or codes of the production control document and ND regulating the requirements for assessing the quality of the controlled object during VIC.
2. When filling out clause 2 of the Act, it indicates all deviations from the ND norms identified during the inspection of specific objects (pipes, parts, etc.). In cases where the object of control meets the requirements of the RD, a note is made in the report - “There are no defects.” In this case, the numbers of specific objects are indicated in accordance with the documents given above. It is allowed to issue one Certificate for a batch of pipes and parts of the same type.
Requirements for the content of the “Journal of work and registration of visual and measurement control results.”
The results of inspection of objects are recorded in the “Journal of work and registration of visual and measurement inspection results”, in which they indicate:
It is allowed to use instead of the above other forms of documents developed by the organization in accordance with the requirements of the scientific and technical documentation, which ensure the identification and traceability of products, recording of controlled parameters, volumes and methods of control, preparation of reporting and accounting documentation according to VIC.
It is allowed to document control results in other documents, the forms of which are given in the current ND, agreed upon or approved by Rostechnadzor of Russia.
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MAGAZINE
MAGAZINE
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3. A corded book in an institution for recording any actions, decisions, resolutions (cancellation). Ship's log. Meeting log. Logbook. Journal of military operations.
Ushakov's Explanatory Dictionary. D.N. Ushakov. 1935-1940.
Synonyms:
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magazine- a, m. journal, goal. journalal. 1. Book of daily entries. Sl. 18. || A book of records of military operations, sea voyages, travel, scientific observations. Sl. 18. Detailed keeping of ship logs in Russia was established in 1702 by A. E... Historical Dictionary of Gallicisms of the Russian Language
magazine- magazine: A periodical journal publication that has a constant heading and contains articles or abstracts on various issues and literary works. Note The journal may have an attachment. Source … Dictionary-reference book of terms of normative and technical documentation
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MAGAZINE, ah, husband. 1. A periodical publication in the form of a book containing articles, works of different authors, as well as a separate book of such a publication. Monthly Literary Fashionable (fashion magazine). Published in magazines. 2. Book or notebook… … Ozhegov's Explanatory Dictionary
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In order to carry out a high-quality and complete assessment of the performance of various systems and structures on industrial enterprises control must be carried out welds, using several methods, e.g. All methods are divided according to the principle of influence on the object under study into two broad groups: non-destructive testing methods and destructive testing methods. The methods of the first group are preferable and more practical to use, but many of them are quite expensive and have their own characteristics. Therefore, it is more economical to start any weld inspection with the simplest method - visual quality control.
This control method is considered the most accessible and efficient and therefore is a mandatory preliminary examination method before carrying out any other method of testing the seam.
A simple optical method for confirming the quality of metal welding
Control of any welding joint begins to be carried out even when the weld is directly created. Visual control is part of the welder’s work, and he periodically conducts an external inspection (for lack of penetration, undercutting and leg fidelity) several times until the entire scope of work is completed. This is also the oldest method of monitoring the final work and its essence has not changed significantly, but the implementation method last years improved. Weld check
Theoretical definition and tools for implementation
Visual-measurement control (VIM) of welds is an external inspection of fairly large welded structures, both with the naked eye and with the help of various technical devices to identify smaller defects that are not amenable to initial visualization, as well as using converters of visual information into telemetric information. VIC refers to organoleptic (carried out by the senses) control methods and is carried out in the visible spectrum of radiation. A visual inspection in search of theoretical defects is carried out from the outside of the weld, where, if they are detected, minimal measurements can be taken using optical instruments and tools, and a visual inspection report can be concluded.
Inspectors use several types of tools when performing visual inspection of welded joints.
- Survey, telescopic, floor magnifiers;
- lenses;
- microscopes;
- endoscopes, etc.
To carry out monitoring under various operating conditions:
- Instruments for workshop purposes. Operating temperature range from +5 °C to +20 °C, conditions of complete rest, normal atmospheric pressure, moderate humidity.
- Field use devices. Operating temperature range from -55 °C to +60 °C, conditions of moderate shaking, vibration, precipitation.
The use of these devices allows for a more accurate search for defects and visual-optical quality control of welds on any objects.
Visual-optical control is the second stage of visual control with a wider, increased range of examination due to the use of optical instruments. Depending on the application, the method is intended for three main groups:
- To search and analyze hidden objects. The following devices are used: endoscopes, borescopes, video systems, periscope flaw detectors.
- To carry out inspection of objects remote from the flaw detector’s workplace. Range of application – a distance of no more than 250 mm from the controller’s eye. Equipment used: telescopic magnifying glasses, binoculars, spotting scopes.
- For examining small nearby objects. The range of application from the specialist's eye is at a distance equal to or less than 250 mm. Equipment used: magnifying glasses, microscopes.
Visual inspection of welds is also required in conditions where the human senses are unsuitable for work. In areas such as: elevated temperatures, dangerous background radiation, external chemically active environment and others. And also in conditions where the configuration of the object under study and its design do not allow a full analysis of the quality and measurement of defects in welds (for example, due to the large height of the object or its underground location). Then, in addition to optical instruments, the following are used to search and analyze hidden objects:
- platforms remote control;
- thermal imaging installations;
- lighting devices;
- automatic systems transportation;
- controlled robots.
Thus, visual information converters allow you to control welding seams baths of hot metal during the melting process.
Measurement control is an important component of VIC, which is carried out in accordance with strict control rules and regulatory documents governing quality. It consists of assigning a category or type to a defect according to one of the characteristics in the form of a specific physical quantity obtained through practical measurement. Measuring instruments and their metrological indicators are indicated in regulatory documents. Measuring tool
During measurement control, the following tools are used, which may be included in the mandatory set of a technical supervision inspector or supplement it:
- measuring magnifiers;
- checking squares 90 0 pattern;
- protractors with vernier;
- calipers, calipers and calipers;
- probes;
- micrometers;
- pipe wall meters and indicator thickness gauges;
- micrometers;
- calibers;
- metal length meter (tape tapes, steel measuring rulers);
- micrometric and indicator bore gauges;
- templates: special, radius, threaded, etc.;
- UShS-2, UShS-3 (templates for geometric parameters of seams);
- surface plates;
- a set of special accessories.
This control method, VIC, refers to methods that are feasible with a minimum set of tools. It consists of collecting information and is based on the qualifications of a specialist, the human factor, but allows you to draw up a visual inspection report of welds, which is considered an objective document.
The essence of external control
The quality of the formation of welds on the surface can be easily assessed during professional inspection. The characteristic of a “high-quality” or “poor-quality” seam is quite arbitrary, since this is a comparative value.
Quality control of welds and inspection of structures, pipelines, and buildings are carried out in three interrelated stages.
Step-by-step procedure for conducting the VIC
- Visual (measuring) control. Preliminary inspection of the seam for corrosion and possible defects with primitive measurements: width, thickness, leg.
- Quality control of welded joints. Quality control is carried out to clarify the parameters of visible defects (after concluding a preliminary inspection report), the size of defects and distortions of welds (percentage deviation from the permissible standard).
- Detailed (instrumental) research and recording of results. More precise methods are used:
- eddy current method for determining the degree of weld wear and metal bending fatigue;
- ultrasonic testing of welded joints to detect serious deep defects;
- penetrant flaw detection for surface and through defects and so on.
Timely and high-quality inspections make it possible to identify the destruction of a seam or weldability defect in the early stages and then clarify the causes of the defect using any non-destructive flaw detection method.
Advantages and disadvantages of this technique
Advantages of the VIC method:
- A simple and accessible method.
- When collecting information about the quality of a design, it allows you to obtain up to 50% of the total volume.
- It is not labor-intensive and does not require expensive equipment.
- Easily tested and re-tested.
Disadvantages of VIC:
- The human factor, which influences 100% of the results.
- Low reliability of the results obtained, subjectivity.
- Used only to search for large defects (at least 0.1 - 0.2 mm) and suspected possible ones.
- Limitation of the study to only the visible part of the structure.
- The technical competence of employees is important; they must correctly select the measurement method, comparative template or standards and give an accurate assessment of the measurement results.
In terms of the method and quality of diagnosis, even imperfect visual inspection of seams is necessary method, both at the stage of complex diagnostics and throughout technological process. Universal welder template
Capabilities of the method for identifying defects
The following welds are subjected to visual inspection:
- when performing surfacing work at the “acceptance-handover” stage, a visual inspection certificate must be drawn up;
- when inspecting a multilayer welded joint (layer-by-layer inspection);
- during the final inspection of the places where the welding arc touches the surface of the base material.
- when assembling parts from assembly units under ;
- in the automatic production of welded parts and technical assessment quality of the material according to the technical process;
- upon expiration deadline operation of welds.
Visual inspection of welds requires mandatory measurement and exclusion of the following defects:
- surface cracks;
- visible gross defects;
- poor quality of metal stripping in welding zones (especially technological fastenings),
as well as control and confirmation of availability:
- branding (marking) of the seam and the accuracy of its production;
- width and height of the seam, convexity and concavity of the seam;
- correct sizes of fillet weld legs.
Defects that can be identified
When examining welds with the naked eye, you can assess:
- uneven height and width of seams;
- excessive scaliness;
- influx;
- undercuts;
- excessive strengthening or weakening of seams;
- unfilled craters;
- burns;
- parameters of fillet weld legs.
Magnifiers and microscopes allow you to detect: – a mandatory stage of working with metal.
Turning of metal sheets and parts is used using special equipment. Read more about this.
Do you need to cut metal efficiently and quickly? Effective method described in the link.
Areas of implementation of this technique
External inspection of the weld is carried out before the stripping, thermal or treatment procedure, as well as after its implementation.
When assessing the quality of a weld, VIC is used:
- As an informative method of describing the general external state.
- As a theoretical method for assessing the internal condition of a seam and as a reason for recommending a more accurate inspection.
- As an evaluation method of the operating conditions of a given seam, structure, system and the entire product.
- As a controlling method of detection gross violations technological process.
- As a method for preliminary conclusion during decommissioning or recording an emergency situation.
- As a predictive method of possible locations of structural failure for a specific set of visible defects found.
- As a final method for assessing and concluding on the correctness, safety and stability of the technological process of manufacturing or repairing a structure.
Visual and measuring control is very effective method checking and rechecking the quality of industrial materials and welded joints when performing construction work and upon receipt of the act of completion of construction, the act of commissioning, as well as various other technical acts.