A welding apparatus comprising: a wire source having welding wire; a wire feed drive for driving the welding wire from the wire source; a wire conduit; a wire nozzle; and characterised by: a wire pulser having a housing 8200), a tube, a split block with a mating slot, a hub having a pin formed thereon, and a slider crank disposed in the housing, the wire pulser having a first end associated with the wire feed drive and a second end associated with the wire conduit; wherein the wire is fed through the wire conduit to the wire nozzle, wherein the slider crank of the wire pulser increases and decreases the effective length of the wire as the wire moves through the wire conduit from the wire feed drive to the wire nozzle, wherein the slider crank includes a t-nut having a t-nut bore disposed in the mating slot of the split block, wherein the split block is disposed about the tube adapted to receive the welding wire, wherein the pin formed from the hub is received by the t-nut bore, and a motor is further disposed within the wire pulser housing and adapted to rotate the pin formed from the hub, wherein rotation of the pin formed from the hub actuates the tube in at least a linear direction. a wire source having welding wire; a wire feed drive for driving the welding wire from the wire source; a wire conduit; a wire nozzle; and characterised by: a wire pulser having a housing 8200), a tube, a split block with a mating slot, a hub having a pin formed thereon, and a slider crank disposed in the housing, the wire pulser having a first end associated with the wire feed drive and a second end associated with the wire conduit; wherein the wire is fed through the wire conduit to the wire nozzle, wherein the slider crank of the wire pulser increases and decreases the effective length of the wire as the wire moves through the wire conduit from the wire feed drive to the wire nozzle, wherein the slider crank includes a t-nut having a t-nut bore disposed in the mating slot of the split block, wherein the split block is disposed about the tube adapted to receive the welding wire, wherein the pin formed from the hub is received by the t-nut bore, and a motor is further disposed within the wire pulser housing and adapted to rotate the pin formed from the hub, wherein rotation of the pin formed from the hub actuates the tube in at least a linear direction. a wire pulser having a housing 8200), a tube, a split block with a mating slot, a hub having a pin formed thereon, and a slider crank disposed in the housing, the wire pulser having a first end associated with the wire feed drive and a second end associated with the wire conduit; wherein the wire is fed through the wire conduit to the wire nozzle, wherein the slider crank of the wire pulser increases and decreases the effective length of the wire as the wire moves through the wire conduit from the wire feed drive to the wire nozzle, wherein the slider crank includes a t-nut having a t-nut bore disposed in the mating slot of the split block, wherein the split block is disposed about the tube adapted to receive the welding wire, wherein the pin formed from the hub is received by the t-nut bore, and a motor is further disposed within the wire pulser housing and adapted to rotate the pin formed from the hub, wherein rotation of the pin formed from the hub actuates the tube in at least a linear direction.