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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F20%3A00344559" target="_blank" >RIV/68407700:21220/20:00344559 - isvavai.cz</a>

Result on the web

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DOI - Digital Object Identifier

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Result language

angličtina

Original language name

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

Original language description

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.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

20301 - Mechanical engineering

Project

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Continuities

S - Specificky vyzkum na vysokych skolach

Publication year

2020

Confidentiality

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