A system for controlling a manufacturing process for packaging units is disclosed, the packaging units are manufactured from a packaging material comprising machine readable identifiers. A control unit associates the identifiers with corresponding data images of the packaging units, wherein for a first process application to manipulate packaging material based on a first set of process parameters, the control unit is configured to store at least part of the first set of process parameters to the associated data image, wherein for a subsequent second process application to manipulate said packaging material, read at least part of the first set of process parameters stored in said associated data image to control the second process application based on at least part of the first set of process parameters.

A welding method is executed by a welding system in which identification signs are arranged on a plurality of original workpieces to be used in a welding process, respectively. On the identification signs, identifiers of the respective original workpieces are readable. The welding method includes executing the welding process such that a part or an entire of the identification signs is hidden in a joint surface on which the plurality of original workpieces are joined in the welding process.

An identifier output method is executed by a welding system. The identifier output method includes: acquiring information on identifiers of a plurality of original workpieces to which identification signs are assigned, respectively, the identification signs being assigned such that information on the identifiers are readable; selecting, from the identifiers of the plurality of original workpieces according to a predetermined rule, an identifier to be set for a welded workpiece to be produced by a welding process using the plurality of original workpieces; and after the selecting, in a case in which any identification sign among the identification signs assigned to the plurality of original workpieces is read by the reading device, outputting, as an identifier of the welded workpiece, the information on the identifier that has been selected to the reading device.

A system (200) for controlling a manufacturing process for packaging units (301′, 302′) is disclosed, the packaging units are manufactured from a packaging material (301, 302) comprising machine readable identifiers (c1, c2). A control unit (210) associates the identifiers with corresponding data images (201, 202) of the packaging units, wherein for a first process application (a1) to manipulate packaging material (301) based on a first set of process parameters (p1), the control unit is configured to store at least part of the first set of process parameters (p1) to the associated data image, wherein for a subsequent second process application (a2) to manipulate said packaging material (301), read at least part of the first set of process parameters (p1) stored in said associated data image (201) to control the second process application (a2) based on at least part of the first set of process parameters (p1).