Changes in Emissivity of the Electrodes for Resistence Spot Welding Due to Their Wear

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21220%2F19%3A00336455" target="_blank" >RIV/68407700:21220/19:00336455 - isvavai.cz</a>
Alternative codes found
RIV/68407700:21340/19:00336455
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Changes in Emissivity of the Electrodes for Resistence Spot Welding Due to Their Wear
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. The condition of electrodes may have significant impact on the resulting weld quality, therefore it is necessary to check the electrodes´ wear that otherwise may cause creation of specific defects in the weld joints. One of the possibilities is utilization of infrared thermography. In order to perform the testing correctly it is essential to know the expected emissivity of the electrodes. This article deals with the changes in emissivity due to wear. It demonstrates that the emissivity of new electrodes is significantly different in comparison with worn electrodes. The biggest change is observed between the first and 25th weld. With increasing number of performed welds the emissivity drops slightly with increasing number of welds. The increased temperature caused significant drops when temperature is elevated up to 40 °C, but it is virtually constant for temperatures above 40 °C. It concludes that a mean „operational“ emissivity of the electrodes operated at higher temperatures (i.e. 40 °C +) is a suitably accurate factor to be used during the weld inspection on defects.
Czech name
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Czech description
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Project
<a href="/en/project/FV10757" target="_blank" >FV10757: Termovision system for non-destructive testing of weld joints</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2019
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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