×

METHOD AND DEVICE FOR SELF-REGULATED WELDING IN THE MANUFACTURE OF LONGITUDINALLY WELDED METAL TUBES

  • US 3,573,416 A
  • Filed: 09/24/1969
  • Issued: 04/06/1971
  • Est. Priority Date: 09/28/1968
  • Status: Expired due to Term
First Claim
Patent Images

1. A method of regulating welding in the manufacture of longitudinally welded metal tubes from a metal band comprising the steps of continuously measurIng the basic quantities of feeding speed of the band, active electric welding power, upsetting pressure and temperature of the welding seam;

  • electing one of said basic quantities as reference quantity;

    converting the measured values into electric signals;

    making ratios of the signals corresponding to each three basic quantities to the signal corresponding to said reference quantity for obtaining three quotient signals;

    prefixing three limit signals for said ratios such as these give optimal welding results;

    comparing each said quotient signals with the respective prefixed limit signal for obtaining three difference signals;

    making the algebraic sum of said difference signals for obtaining a sum signal;

    causing said sum signal to act on at least one of said three basic quantities until the suppression of said difference signals.

View all claims
  • 0 Assignments
Timeline View
Assignment View
    ×
    ×