Method for resuming a wire sawing process of a workpiece after an unplanned interruption

A method for resuming an interrupted process for sawing a workpiece into a multiplicity of wafers using a wire saw, the wire saw including a sawing wire which spans a wire web including a plurality of wire sections arranged in parallel, the sawing wire being unwound from a feed spool with a forward movement and guided over at least one rotatable deflection pulley into the wire web, leaving the wire web via at least one further rotatable deflection pulley, and being wound onto a take-up spool, the interrupted process, before the interruption, including alternately moving the sawing wire in defined time intervals forward by a first length L1 and backward by a second length L2, the method for resuming the interrupted process comprising:

• advancing the wire web into existing sawing kerfs of the workpiece with a forward movement of the sawing wire with a first speed v1 and in the presence of a liquid sawing medium until the wire web or workpiece has reached a position corresponding to the interruption of the wire sawing process and the sawing wire comes to a stop;
• alternately moving the sawing wire in defined time intervals by a forward movement having a third length L3 with a speed v and a backward movement having a fourth length L4 with a speed v′, the fourth length L4 being less than the third length L3 and the forward and backward movement corresponding to a cycle, and
• increasing the wire length unwound during the forward movement until the third length L3 corresponds to the first length L1 of the forward movement before the interruption.