Clean quality focus
Medical Device Weld Planning
A conservative workflow for stainless and titanium weld quality, cleaning, and inspection planning.
Main challengeClean repeatability
Surface handling, discoloration, and tiny visible defects matter earlier than raw throughput.
Hold firstPreparation
Clean handling, surface prep, and shielding discipline come before parameter judgment.
Proof packageTraceable samples
Tie each passing sample to the exact material lot, fixture, cleaning method, and inspection result.
Clean weld workflow
| Step | What to control | Evidence to keep |
|---|---|---|
| Material handling | Separate stainless/titanium tools, clean surfaces, and limit handling after cleaning. | Record cleaning method and time between cleaning and welding. |
| Shielding | Set primary, trailing, or backside shielding based on material and joint access. | Discoloration and oxide evidence are early shielding signals. |
| Thermal input | Start with the smallest stable weld that meets penetration and strength targets. | Compare distortion, HAZ width, and surface finish across samples. |
| Inspection record | Save visual photos, microscope images when used, and cross-section measurements. | Tie each image to material batch, fixture, and parameter set. |
When cosmetic and metallurgical targets compete
| Observed conflict | Move first | Do not skip |
|---|---|---|
| Surface finish improves but penetration falls | Recover depth with a controlled energy increase rather than broad speed reduction. | Recheck discoloration, HAZ width, and root condition after the change. |
| Penetration is good but discoloration increases | Review shield coverage, purity, and part handling before reducing power. | Discoloration on stainless or titanium can be a shielding/process-discipline problem, not only a heat problem. |
| Tiny pores appear only under sectioning | Tighten cleaning, shielding, and handling controls before broad parameter changes. | Keep microscope or section evidence attached to the exact sample ID and lot. |
| Part distortion affects downstream assembly | Reduce total heat input and review fixture support or weld sequence. | A visually clean weld can still fail assembly fit if distortion is not controlled. |
Traceability record
| Record item | Minimum content | Why it matters |
|---|---|---|
| Cleaning method | Chemical or mechanical method, operator, and time from cleaning to welding. | Explains variation in oxidation, porosity, and cosmetic outcome. |
| Shielding setup | Gas type, purity, flow, nozzle path, trailing/backside gas when used. | Discoloration and oxide pickup are often shielding-driven. |
| Visual archive | Top surface, root/access side, microscope images where used, and rejected conditions. | Supports cosmetic acceptance and defect trend review. |
| Section record | Penetration, width, HAZ, pore/crack evidence, and sample position. | Confirms the hidden structure behind the visual result. |
Use these next for clean-quality weld planning
Surface Quality PredictorEstimate roughness, visible imperfections, and quality-level planning against ISO 13919 references.Joint Strength CalculatorEstimate load capacity and safety-factor assumptions for welded joints.Crack Risk CalculatorScreen material, carbon equivalent, restraint, and cooling assumptions for crack risk.Weld Quality Inspection GuideConnect ISO 13919 quality levels with shop-floor inspection steps for visible weld outcomes.Material Preparation GuideSurface cleaning, oxide control, fixture checks, and shielding preparation for common materials.Weld Quality Standards MatrixQuality-level references for steel, nickel, titanium, and aluminum laser beam welded joints.
Applicable standards
Confirm final requirements against the current standard text, workplace procedure, and project specification before releasing production settings.