Using of the Infrared Thermography as a Testing Method for Resistence Spot Welds for Automotive

Kód výsledku v IS VaVaI

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Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Using of the Infrared Thermography as a Testing Method for Resistence Spot Welds for Automotive

Popis výsledku v původním jazyce

Resistance spot welding is one of the most used welding technologies for joining of thin, deep drawn steel sheets in automotive industry. Currently, there is no universal NDT method capable to inspect the resistance spot welds thoroughly that would provide complex assessment of their condition. Conventional NDT methods are limited only to the ultrasonic testing and visual testing, with only partially serious results. This article is dealing with one of the emerging methods using for quality control, the online thermography testing, which is capable to assess the acceptance of the weld joints immediately after the welding process. For correct assessment, it is necessary to know the emissivity of tested sheet and the electrode tips. Evaluation is based on comparative analysis of a database of hundreds of thermographs of acceptable and non-acceptable resistance spot welds. Maximal and minimal temperature and all detected deviations from the acceptable conditions are uploaded to a software and processed via a specially designed algorithm that divides the welds into acceptable and non-acceptable. Experiments demonstrated that the thermographic testing is suitable for detection of non-acceptable resistance spot welds, usually caused by deviations in one of the primary welding parameters of the resistance spot welding, i.e. electric current, force and the welding time.

Název v anglickém jazyce

Using of the Infrared Thermography as a Testing Method for Resistence Spot Welds for Automotive

Popis výsledku anglicky

Resistance spot welding is one of the most used welding technologies for joining of thin, deep drawn steel sheets in automotive industry. Currently, there is no universal NDT method capable to inspect the resistance spot welds thoroughly that would provide complex assessment of their condition. Conventional NDT methods are limited only to the ultrasonic testing and visual testing, with only partially serious results. This article is dealing with one of the emerging methods using for quality control, the online thermography testing, which is capable to assess the acceptance of the weld joints immediately after the welding process. For correct assessment, it is necessary to know the emissivity of tested sheet and the electrode tips. Evaluation is based on comparative analysis of a database of hundreds of thermographs of acceptable and non-acceptable resistance spot welds. Maximal and minimal temperature and all detected deviations from the acceptable conditions are uploaded to a software and processed via a specially designed algorithm that divides the welds into acceptable and non-acceptable. Experiments demonstrated that the thermographic testing is suitable for detection of non-acceptable resistance spot welds, usually caused by deviations in one of the primary welding parameters of the resistance spot welding, i.e. electric current, force and the welding time.

Druh

O - Ostatní výsledky

CEP obor

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OECD FORD obor

20301 - Mechanical engineering

Projekt

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Návaznosti

S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2021

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů