Quality & Traceability — July 2026
Traceability Starts Before the Part Starts — It Ends With What's Marked On It
A lot code stamped into the wrong area can ruin a part before it ever leaves the shop. Here's how marking is actually done right.
When a carbide wear component or knife blade fails in the field, the first question from a quality team is rarely "what happened?" It's "which lot, which heat, which work order?" If the part can't answer that question on its own, the investigation stalls, the whole affected lot gets treated as suspect, and a single-part failure turns into a full-PO containment exercise. That's the practical cost of a traceability gap, and it's decided at the marking step — long before anyone is asking questions about a failure at all.
Most procurement specs treat marking as a checkbox: "part shall be identified per print." What that line item doesn't say is how you're supposed to put a permanent, legible identifier on a material that's harder than the tool you'd normally use to stamp it — without cracking it.
Why Mechanical Marking Doesn't Work on Carbide
Steel components get stamped, engraved, or vibro-etched without much thought, because steel deforms locally around the marking tool. Carbide doesn't deform — it's a sintered, brittle material, and any mechanical marking method that relies on impact or point pressure risks introducing a micro-crack at exactly the spot where the identifying mark lives. On a wear component or a knife edge, that's not a cosmetic risk. It's a stress riser sitting on a part that's about to go into a high-cycle, high-load application.
That's why every carbide part we mark for lot or serial identification goes through non-contact laser marking, not a stamp, punch, or vibro-etch tool. A fiber laser removes a controlled, microscopic layer of material to leave a permanent mark with zero mechanical force on the part — no risk of the crack initiation that a physical marking tool can leave behind on a brittle substrate.
Three Facts About Laser Marking Carbide
Zero contact force: the beam never touches the part, so there's no mechanical stress and no crack-initiation risk on a brittle substrate.
Deep enough to survive, shallow enough to be safe: the mark can hold through grinding, coating, and years of service — without cutting deep enough to weaken the surrounding material.
What Actually Gets Marked
"Identify per print" usually resolves into a specific combination of the following, and the right combination depends on the customer's quality system, not on what's convenient for us to apply:
Lot & Heat Code
Ties the finished part back to raw material certification
Connects a specific part to the material batch or carbide powder lot and press/sinter batch it came from — the record a materials review board asks for first when a failure investigation opens.
Part Number & Drawing Revision
Confirms the part in hand matches the print on file
On a made-to-print component with no catalog equivalent, the revision letter is what confirms a part built eighteen months ago still matches the current engineering baseline.
Date Code & Work Order
Narrows a containment action to the parts that actually need it
If one work order shows a deviation, a legible date/work-order mark is what keeps containment scoped to that lot instead of every part shipped that quarter.
2D Data Matrix, Where Specified
Machine-readable traceability for high-volume automotive programs
Tier 1 and Tier 2 automotive programs increasingly want a scannable code rather than a human-readable string alone — we mark to whichever format the customer's own system requires.
Where This Stops Being Optional
For aerospace work under AS9100-flowed requirements, and for automotive components flowing down under IATF 16949, full lot traceability isn't a nice-to-have — it's a contractual condition of supply. A supplier who can't produce a part-to-lot-to-material-cert chain on request isn't a supplier those primes and Tier 1s can keep using, regardless of how good the part itself is. The same logic applies, quietly, to carbide tooling and wear components: when a customer's own end product gets recalled, the first thing their engineering team needs is a fast, accurate answer about which of our lots are actually implicated.
Because CPI builds every part to a customer's print rather than to a catalog, there's no default serialization scheme we fall back on. The marking spec gets built into the job the same way the tolerance and material grade do — as a print requirement, not an afterthought applied at the end of the run.
What to Send Us
If your print already specifies a marking standard, lot-traceability format, or a customer-flowed quality requirement, send it along with the part drawing and we'll quote it as specified. If it doesn't yet, and you're not sure what your own quality system or your customer's PPAP requirements actually call for, tell us the industry and the end application — we'll tell you what's typically required and what we'd recommend marking on the part itself.
Get a Quote
Need Full Lot Traceability For Your Parts?
Send us the print and your quality requirements — we'll quote the part and the marking spec together, not as an afterthought.
Request a Quote