In additive manufacturing (AM), achieving the right Ra surface roughness is one of the most important finishing challenges. It's not just a number on a surface measurement chart. Ra directly influences how a part performs, how long it lasts and whether it meets certification standards.
Why Ra surface roughness control matters:
• Mechanical performance: Higher Ra values can act as stress concentrators, reducing fatigue life and increasing the risk of crack initiation. Lower, controlled Ra values improve strength and reliability.
• Functionality: Ra affects friction, sealing capability, fluid dynamics and, in medical implants, even how tissue interacts with the material.
• Dimensional accuracy and appearance: Consistent Ra values are critical for parts that need both precision and an attractive finish.
• Reproducibility: Meeting aerospace, medical and automotive requirements demands surfaces that achieve the same Ra values from part to part, batch to batch.
How wet blasting ensures consistent Ra values:
Wet blasting suspends fine abrasives in water to deliver a highly controlled, even treatment. This method allows manufacturers to:
• Reduce Ra values uniformly, even on complex geometries.
• Fine-tune parameters to achieve specific target Ra values.
• Avoid micro-cracking, residual stress and embedded media associated with dry blasting.
• Combine cleaning and finishing, removing loose powder and oxides while adjusting Ra.
• Automate the process for repeatable Ra outcomes across multiple builds.
Ra surface roughness is more than a measurement; it is a critical performance factor for additive manufactured parts. Wet blasting offers a controlled, repeatable and production-ready way to achieve and maintain target Ra values, ensuring AM parts meet the highest standards of quality and reliability.
