An experimental study on contact resistance of coated galvanized steel sheet
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A contact resistance measurement system was developed based on a four-wire contact resistance measurement method. A series of experiments were conducted on four kinds of coated galvanized steel sheets using the contact resistance measurement system at different pressures and temperatures. The results showed that pressure and temperature had great effect on contact resistance. The contact resistance was not stable during the initial period when the pressure was changeless and subsequently decreased with the increase of pressure. The contact resistance did not always decline with the temperature at low temperatures because of the joint effects of the electrical and mechanical properties of base metal and the films. However, the contact resistance decreased when the temperature rose within a certain temperature range.
KeywordsContact resistance Surface conditions Galvanised steel·surface Resistance welding
This research was financially supported by the Fundamental Research Funds for the Central Universities of P.R. China (NO. 2015B30514 & NO. 2014B11614).
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