In my company our process validations include machining validations, welding validations, validation of assembly fixtures, and finishing validations, such as electropolish validations. One of the validations that we always struggle with is welding validation, and this is mainly due to the fact that our weld validation procedures are confusing, poorly defined, and overly stringent. Does anyone have experience with process validations that were very difficult to pass due to a very strict internal company procedure?