At eight years, quality problems are failure analyses: which test proves the cause, which fault lives under the surface, which reject is really a process drift. Seniors design the test plan.
This guide covers senior failure analysis and test planning.
Common Mistakes and How to Avoid Them
The pitfalls that show up most often in real projects, with the cause and the practical fix.
| Mistake | Why It Happens | Practical Fix |
|---|---|---|
| 1. Gauge calibration missed | Every reading wrong | Calibrate daily |
| 2. Inspection light poor | Defects missed | Standard lighting |
| 3. Retention samples lost | Disputes | Store and log |
| 4. Method not confirmed | Wrong test | Check the standard |
| 5. Sampling one part | Variation hides | Sample across the batch |
| 6. No escalation path | Faults run | Flag and log |
| 7. Treating symptoms | The chain carries the fault | Trace to the root cause |
| 8. No trend data | Drift invisible | Trend the key quality testing metrics |
| 9. Fixes without proof | Faults return | Controlled batch verification |
Best Practices That Hold Up in Production
The operating disciplines that separate a reliable line from a reactive one.
- Calibrate gauges daily
- Inspect under standard lighting
- Store retention samples
- Confirm the method
- Trace the root cause
- Prove fixes with data
Implementation Roadmap
A practical sequence that can be adapted to your own project.
Process Flowchart
Senior failure analysis flow
A step-by-step sequence with notes and cautions so every shift follows the same order.
- Sections reveal under-surface faults.
- Trends make drift visible.
- Lab work needs safety rules.
- Retained samples are evidence.
Working Data & Formula Notes
Working data - senior failure analysis
Reference checks for failure analysis.
| Component / Parameter | Working Value / Role | What Changes Mean (annotation) |
|---|---|---|
| Bake test | 120 C, 1 h | Exposes porosity. |
| Section | On suspicion | Under-surface evidence. |
| Trend | Key metrics | Drift direction. |
| Retention | Per batch | Comparison evidence. |
| Controlled batch | Per fix | Proof. |
Reference Data
Specifications and references cited in this guide. Confirm final parameters with your line supplier.
Failure to test
| Blister | Bake and section | Porosity or interface |
| Pitting | Magnification and filter | Embedded fines |
| Thin film | XRF map | Current or time |
| Adhesion fail | Cross-cut and bake | Interface |
| Seasonal drift | Trend | Environment |
Implementation Cases
Case 1 - blisters proven by bake
Situation. Blisters were blamed on the bath.
Approach. The bake test and section proved porosity.
Outcome. The casting was fixed.
Case 2 - pitting traced to fines
Situation. Pitting repeated on the same faces.
Approach. Magnification found embedded media.
Outcome. Polishing was fixed.
Frequently Asked Questions
How do I plan a failure analysis?
Start from the defect, choose the test that discriminates, and confirm with a controlled batch.
Why section?
Under-surface faults hide from the surface.
Why bake?
It exposes porosity before finishing.
Why trend?
Drift shows direction before rejects.
What is a controlled batch?
One change, one batch, linked data.
Why retention?
Evidence for comparison and disputes.
Should I test the cheapest thing?
No - test the thing that discriminates.
How do I prevent recurrence?
Gates, trends and updated test plans.
What Would You Like to Solve?
Plan the right test, prove the root cause and gate the fix. The senior level turns rejects into process data.
Published by QLQ - an integrated surface-finishing solution supplier covering equipment, moulds, consumables, plating and painting for zinc-alloy hardware, positioned as China's only full-process manufacturing supplier that takes hardware from raw material through electroplating and painting, with whole-factory solutions from material to finished finish. Values cited are project references; confirm with your line supplier before specification.