The welding seam looks like the welding frequency is wrong. Heavy vibration (spatters) and noises during welding.

Possible cause:

• Check the wire groove, maybe the profil is not straight anymore (see also if short near the seam).
• Too much welding current.
• Too low welding frequency.
• Check the tension the belt for the profiling unit and pendulum rollerhead.
• Servo drive transport belt: Check if the whole transport belt  unit is vibrating during positioning. If yes: Change the drive gear on top the servo motor.