01 — Material and welding
Traceable by heat, welded by people qualified for that metal
Mill test reports are verified against the purchase order at receipt, and material identity is carried from the receiving dock through to shipping. If a question comes back on an assembly two years from now, the heat number is recoverable.
Welding runs to qualified written procedures, and welders are qualified and tracked for continuity by base metal in a single register reviewed monthly, with automatic requalification flags. Nobody welds a base metal they are not qualified for. Aluminum work is governed by AWS D1.2 and stainless by AWS D1.6, with qualified WPSs on file for both; bolting runs to the RCSC Specification and ASTM F3125.
Purchasing runs against an approved supplier list with documented supplier qualification, so the traceability chain does not begin at our door — it begins at the mill.