METHOD AND APPARATUS FOR LONGITUDINAL-SEAM WELDING OF PROFILED TUBES IN A TUBE-WELDING SYSTEM

摘要

A method for longitudinal seam welding of profiletubes is disclosed. A tube-welding system is connected to asystem computer for process control. A slotted tube formeddirectly in line from a metal strip in a row forming mill, or aslotted tube reshaped from at least one sheet metal panel issupplied. The tube-welding system is equipped with means formeasuring the temperature of a welding point. The methodincludes continuously determining temperature fluctuations anda shifting of the welding point using a thermal-imaging cameraand producing an output of continuously measured image data.Furthermore, the method includes processing the continuouslymeasured data from the camera for regulating the weldingprocess such that the welding point at its hottest is always inthe same position. A corresponding apparatus is alsodisclosed.