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电阻点焊

电阻焊 is a thermo-electric process where heat is generated at the interface of the parts to be joined by passing an electrical current through them or a precisely controlled time and under a controlled pressure (also called force). The name “resistance” spot welding derives from the fact that the resistance of the workpieces and electrodes are used in combination or contrast to generate the heat at their interface.

电阻点焊过程的主要优点包括:

 

  • 处理时间非常短
  • 不需要任何耗材,如钎焊材料、焊料或焊条等
  • 由于电压低,因此操作安全
  • 清洁环保
  • 可形成可靠的电机连接


Resistance spot welding is a fairly simple heat generation process: the passage of current through a resistance generates heat. This is the same principle used in the operation of heating coils. In addition to the bulk resistances, the contact resistances also play a major role. The contact resistances are influenced by the surface condition (surface roughness, cleanliness, oxidation, and platings).

电阻焊的常规发热公式为:

热量 = I2 x R x t x K


Where “I” is the weld current through the workpieces, “R” is the electrical resistance (in ohms) of the workpieces, “t” is the weld time (in hertz, milliseconds or microseconds), and “K” is a thermal constant. The weld current (I) and duration of current (t) are controlled by the resistance welding power supply. The resistance of the workpieces (R) is a function of the weld force and the materials used. The thermal constant “K” can be affected by part geometry, fixturing and weld force.

The bulk and contact resistance values of the workpieces, electrodes, and their interfaces both cause and affect the amount of heat generated.  The diagram (above right) illustrates three contact and four bulk resistance values, which, combined, help determine the heat generated.

参见 点焊 了解更多信息

如欲了解有关电阻焊工艺的更多信息,请阅读 《电阻焊基本原理》, 精点电阻焊应用 大型点焊应用。


 

 

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