Project background
A buyer needed a welded aluminum chassis for a rack-mounted enclosure, with several load-bearing seams and two mounting faces that had to stay flat after welding. The quote risk was not only material and thickness; fixture planning and weld sequence decided whether the chassis held its critical dimensions.
What the buyer sent
3D model and 2D drawing with critical mounting faces markedMaterial target was 5052 aluminum at 2.0 mm thicknessTwo load-bearing welded seams and one cosmetic seamFlatness tolerance was called out on both mounting facesPilot quantity was 20 units before production release
Manufacturing decisions
| Decision point | Resolution |
|---|---|
| Fixture planning | Reviewed which faces had to stay flat and locked the weld order before fixturing. |
| Weld sequence | Sequenced welds to balance heat input and reduce pull on the mounting faces. |
| Distortion check | Measured flatness against the marked critical faces after welding. |
| Grinding limits | Confirmed which welds could be ground flush and which needed to stay as-welded. |
| First article | Checked flatness and hole alignment before releasing the pilot batch. |
Result buyers can compare
The case is useful because it shows how file status, material, thickness, forming risk, hardware and inspection evidence change the quote path. A similar buyer should send drawings, marked critical dimensions, finish expectations and quantity tiers before comparing suppliers.