Choose the suitable electrode and filler material
With this method there may still be bubbles but it may improve the failures
Ensure proper cleaning of the base metal and prevent pollutants from entering the welding area.
Cleanliness can always help and not destroy, preventing external infections may improve the process
Optimize the welding process and speed to ensure gas escape.
maybe Optimize the welding process by Use of laser welding due to its accuracy and external thermal effect on the processed part. This welding requires local suction control and protections from laser radiation. with that method it can also control on speeds
Controlling the intensity and speed of welding