A welding or additive manufacturing system, comprising: a contact tip assembly having a first bore terminating a first exit orifice and second bore terminating a second exit orifice, where said first exit orifice delivers a first wire electrode and said second exit orifice delivers a second wire electrode; wherein said first and second exit orifices are separated from each other such that a distance S is provided between said first and second wire electrode; the system being characterised by: at least one power supply and a controller, the controller configured to control operation of said power supply, and said power supply configured to provide a current waveform to the contact tip assembly, wherein the current waveform has a frequency and includes a bridge current portion having a bridge current level and a peak current portion having a peak current level different from the bridge current level, wherein the bridge current level is produced directly after or before the peak current portion, with the bridge current portion being lower than the peak current portion, wherein, in use, the bridge current portion and the peak current portion are maintained each for a predetermined duration, wherein, in use, said contact tip assembly delivers said current waveform to each of said first and second wire electrode; wherein said distance S is so selected that it facilitates in use formation of a bridge droplet between said first and second wire electrode by said current waveform, so that solid portions of the wire electrodes are not drawn to contact each other, during a deposition operation in which the current waveform is conducted to both of the first wire electrode and the second wire electrode simultaneously through the contact tip assembly, wherein, in use, a current due to the current waveform flows from the contact tip assembly to the bridge droplet through both of the first wire electrode and the second wire electrode and the current is divided between the first wire electrode and the second wire electrode, wherein, in use, the current flows from the bridge droplet to a workpiece during the deposition operation, and wherein, in use, the bridge droplet between the first wire electrode and the second wire electrode is formed during the bridge current portion of the current. a contact tip assembly having a first bore terminating a first exit orifice and second bore terminating a second exit orifice, where said first exit orifice delivers a first wire electrode and said second exit orifice delivers a second wire electrode; wherein said first and second exit orifices are separated from each other such that a distance S is provided between said first and second wire electrode; wherein the current waveform has a frequency and includes a bridge current portion having a bridge current level and a peak current portion having a peak current level different from the bridge current level, wherein the bridge current level is produced directly after or before the peak current portion, with the bridge current portion being lower than the peak current portion, wherein, in use, the bridge current portion and the peak current portion are maintained each for a predetermined duration, wherein, in use, said contact tip assembly delivers said current waveform to each of said first and second wire electrode; wherein said distance S is so selected that it facilitates in use formation of a bridge droplet between said first and second wire electrode by said current waveform, so that solid portions of the wire electrodes are not drawn to contact each other, during a deposition operation in which the current waveform is conducted to both of the first wire electrode and the second wire electrode simultaneously through the contact tip assembly, wherein, in use, a current due to the current waveform flows from the contact tip assembly to the bridge droplet through both of the first wire electrode and the second wire electrode and the current is divided between the first wire electrode and the second wire electrode, wherein, in use, the current flows from the bridge droplet to a workpiece during the deposition operation, and wherein, in use, the bridge droplet between the first wire electrode and the second wire electrode is formed during the bridge current portion of the current.