Control method and device for tension fluctuation generated when galvanized wire weld joints pass through finishing machine

The invention provides a control method for tension fluctuation generated when galvanized wire weld joints pass through a finishing machine. The control method includes the steps that before the firstband steel weld joint reaches the finishing machine, the finishing machine stops ductility control, and the finishing machine is controlled to set rolling force to be reduced to decompression rollingforce; a first decompression rate is acquired, wherein the first decompression rate is the decompression rate achieved before the first band steel weld joint reaches the finishing machine; a second decompression rate is acquired, wherein the second decompression rate and the first decompression rate are equal; and after the first band steel weld joint passes through the finishing machine, the finishing machine is controlled to set the rolling force to be increased to set rolling force of second band steel according to the second decompression rate. The technical problems that in the prior art, during decompression of