Influence of Temperature in the Contact Area on the Static Welding Characteristics of Electrical Contacts

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  • 電気接点の静的溶着特性におよぼす接触点温度の影響について
  • デンキ セッテン ノ セイテキ ヨウチャク トクセイ ニ オヨボス セッショクテン オンド ノ エイキョウ ニ ツイテ

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The mutual relationship between the static welding behavior and physical characteristics of contact materials has been obtained with an X-Y recorder and an oscilloscope for various metals and alloys.<BR>Light welding or sticking occurs at the softening temperature of the material in the contact area, and heavy welding occurs at its melting temperature. The temperature of the contact area which has influence on the welding behavior is correlated to the current density in the contact area. The I⁄d is given by<BR>(This article is not displayable. Please see full text pdf.) <BR>where I is the contact current, d is the diameter of the circular contact area, T is the maximum temperature in the contact area, Tr is room temperature, ρr is the electrical resistivity at room temperature, α is the temperature coefficient of electrical resistivity, and L is the Wiedemann-Franz constant and is equal to 2.45×10−8 (V/deg)2.<BR>The higher the melting temperature or the larger the temperature coefficient of electrical resistivity of the contact material, the more hardly the contact area can attain its melting state.<BR>It is considered that the stationary melting state cannot exist in the static contact area.

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