Linear welding is a joining method in which a connection of metal objects is created by many spot welds formed in the liquid state, arranged side by side along a specific line thanks to the use of disc electrodes that supply current and exert welding pressure.

Depending on the kinetics of electrode movement, the course of current pulses and their duration, linear resistance welding can be divided into:

  • continuous - disc electrodes are driven at a constant speed, and the welding current flows through the electrodes and connector continuously at a constant welding pressure. In this way, the weld is created as one continuous seam
  • intermittent - the disk electrodes rotate at a constant speed and the welding current flows at regular intervals
  • step - consists in the step rotation of the rotary electrodes, which are stopped for the duration of the current flow and rotate by a specific step during the interruption of its flow


  • current in kA (alternating and direct current)
  • clamping force in kN - welding speed in mm / min
  • welding current flow time in s
  • pause time in current flow in seconds
  • working dimensions and type of material at the electrodes


Linear welding is mainly used where tight connections should be made to fuel tanks, household appliances, cars and wagons. The process is not suitable for joining thick plates.