The invention relates to a control method of eliminating yield point elongation at the front part and the rear part of a weld joint of cold-rolled
strip steel and belongs to the technical field of cold-rolled
strip steel production control. According to the technical scheme, the control method comprises the following steps: when the
strip steel is continuously produced, an operator determines the minimum
scrap cutting knife number at a strip
tail and the minimum
scrap cutting knife number at a strip head according to the following formula in light of speed of the weld joint passing through a temper mill, and then the operator sets the minimum
scrap cutting knife number at the strip
tail and the minimum scrap cutting knife number at the strip head at an outlet for roll dividing: Y1 is greater than or equal to ROUNDUP{(0.58595+0.01384*X) / 0.45, 0}; Y2 is greater than or equal to ROUNDUP{(5.48925-0.04198*X+0.000346*X<2>) / 0.45, 0}, wherein Y1 is the minimum scrap cutting knife number at the strip
tail, Y2 is the minimum scrap cutting knife number at the strip head and X is the speed of the weld joint passing through the temper mill, the unit of the speed is m / min; 0.45 is the length of scrap
cut at the outlet every time and the unit is m. The control method provided by the invention has the beneficial effects that the control method is simple; the operator sets the speed of the weld joint passing through the temper mill according to
rhythm of production and sets the corresponding minimum scrap cutting knife numbers at the front part and the rear part of the weld joint at the outlet, so that objection about quality caused by defects of fish scales as the head and tail are not thoroughly
cut off is reduced while the product quality is guaranteed, and meanwhile, the production efficiency is increased.