Assessment Of Apparent Temperature Of The Electrode Tips and Welded Joints For Classification of the Resistance Spot Welds by Infrared Thermography

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

Assessment Of Apparent Temperature Of The Electrode Tips and Welded Joints For Classification of the Resistance Spot Welds by Infrared Thermography

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 and provide complex assessment of their condition. Conventional NDT methods are basically limited only to the ultrasonic testing and visual testing with only partially reliable outcomes. One of potentially promising methods is infrared thermography. This article is dealing with online thermography testing that is capable to assess the acceptance of the weld joint immediately after 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. The experiment shown distinct temperatures for suboptimal welding parameters and optimized welding parameters that may be used for characterization of the weld joint condition. This information may be important for measurement of real thermal field of the welded sheet during testing of the welding process as well as the deterioration of the welding electrode tips.

Název v anglickém jazyce

Assessment Of Apparent Temperature Of The Electrode Tips and Welded Joints For Classification of the Resistance Spot Welds by Infrared Thermography

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 and provide complex assessment of their condition. Conventional NDT methods are basically limited only to the ultrasonic testing and visual testing with only partially reliable outcomes. One of potentially promising methods is infrared thermography. This article is dealing with online thermography testing that is capable to assess the acceptance of the weld joint immediately after 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. The experiment shown distinct temperatures for suboptimal welding parameters and optimized welding parameters that may be used for characterization of the weld joint condition. This information may be important for measurement of real thermal field of the welded sheet during testing of the welding process as well as the deterioration of the welding electrode tips.

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

2020

Kód důvěrnosti údajů

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