Thermal welding tool
- Situation
- The Pellethane thermal welding process for a new heart pump had a low yield.
- Task
- Design a new tool and welding process to increase yield.
- Action
- Designed a new mandrel in SolidWorks that worked with existing cleanroom equipment.
- Tuned the mechanical fit with 3D-printed prototypes, then sent drawings to be machined in-house.
- Traced inconsistent weld quality to a heat-sink effect in the mandrel, then redesigned it with a band of material removed near the cool end.
- Used a process window to tune the inputs until parts came out consistently acceptable.
- Result
- A new tool and process that increased yield by 20%.






