MTRs arrive the way material arrives: by delivery, in a bundle, from a vendor. They get reviewed the opposite way — one heat number at a time, starting from a weld on a drawing. Almost every painful MTR package is a package filed the way it arrived rather than the way it will be read.
Your weld log is the index to your MTR package. If you cannot go from a weld number to a heat number to a certificate in three steps, neither can the client.
File by heat number, not by delivery
Filing by purchase order or packing slip feels organised at receipt and fails completely at review. Nobody reviewing your package knows or cares which PO the material came in on. They know a weld number, they look up its heats, and they want the certificate.
Index by heat number. Keep the packing slips — they are useful for a different question — but they are not the organising principle.
Check at receipt, not at turnover
The single most expensive habit in material control is stacking MTRs unread until the package is due. At receipt, three things take a minute each and are nearly free to fix:
- Is it the right grade and specification? Compare against the line class or the requisition, not against what you expected to arrive.
- Is it legible? A third-generation fax of a mill certificate is not a certificate. Ask for a clean copy while the vendor still has the order open and remembers you.
- Does the heat number on the certificate match the marking on the material? This is the one everybody assumes and nobody checks.
Every one of those becomes a week-long chase at turnover, when the vendor has moved on and the material is already in the ground.
The awkward cases, handled early
One certificate, several components
A single MTR often covers multiple items from one heat. That is fine, but your index has to point every one of those items at the same certificate, or the second and third will look missing.
Partial heats and offcuts
When a length gets cut across two spools, both welds trace to the same heat. Obvious in the moment, invisible three months later. Record it when you cut it.
Material that arrives without a certificate
It happens, and the answer is never "we will get it later." Raise it as a nonconformance the day it arrives. An open NCR with a documented chase is a defensible position. Silence is not.
What good looks like at handover
A reviewer should be able to pick any weld on the log at random, read its two heat numbers, and find both certificates without asking you a question. If picking a weld at random makes you nervous, the package is not ready — and that nervousness is worth taking seriously, because a client auditor will pick exactly the weld you were hoping they would not.