method and device for controlling the zusatzwerkstoffzufuhr to schweissstelle.

摘要

An improved filler wire feed controller for a welding system is described in which the filler wire (5) can be supplied to the vicinity of an arc between an electrode (10) and a workpiece (13) in a four-portion cycle. The cycle can include a feed portion, during which the wire is supplied to the weld pool at a rate at which it is consumed and deposited on the workpiece; a retract portion, during which the wire is rapidly withdrawn from the workpiece; a pause portion, during which the wire is stationary with respect to the arc; and an advance portion, during which the wire is advanced rapidly into the arc. This four-portion cycle provides increased flexibility of control of supply of wire to the weld pool (12), which can be employed to avoid balling of the end of the wire (5). The wire feed supply may be synchronized to variations in the current of the arc and also to movement of the wire guide/electrode assembly with respect to the workpiece.