In this guide 6 sections
Handwritten heat logs fail audits because they leave gaps an auditor can see. Chemistry is missing, tap temperature is blank, the charge mix is vague, figures are overwritten and no link runs from heat to casting. The log may be honest. It cannot prove it.
What an auditor does with your logbook
A customer auditor rarely reads the book front to back. They pick a casting from a recent dispatch and ask for its heat. Then they follow the trail. They watch where it stops.
The usual stopping points are plain. The heat number appears on the delivery note but not in the mould log. The chemistry sits in an OES spectrometer printout stapled to a different page, so which ladle it came from is anyone’s guess.
The book may not be wrong. It simply cannot answer a question within the time, and with the evidence, that the auditor expects.
The gaps that show up again and again
Charge mix is often written as a rough note, such as returns and some pig. An auditor wants weights by material, such as foundry returns, pig iron and steel scrap, because the charge decides the chemistry you start with.
Tap temperature is skipped on busy days. Ferroalloy and inoculant additions are noted without a second reading. Pouring time is missing, so nobody can check that the metal left the ladle within its holding limit.
Chemistry readings drift between formats. One day it is carbon and silicon only. Another day it is the full set with manganese, sulphur and phosphorus. A grade check needs the same elements every time.
- Charge weights missing or rounded
- No tap or pouring temperature
- Additions recorded without a second reading
- Chemistry elements vary heat to heat
- Heat number not carried to moulds
Why handwriting itself is a risk
Overwriting is the quiet failure. It looks bad. A carbon figure struck out and rewritten without initials looks the same as a figure changed after a complaint. Auditors treat both with suspicion.
Pages get torn. They get stained near the furnace or filled out from memory at the end of the shift. Late entries are common. They read like late entries.
A bound book also has one location. If the quality manager is checking it, the melt deck cannot see it. The customer’s query then waits on whoever holds the book.
What a sound heat record looks like
Every field has a fixed place and a required value. The heat cannot be closed until the chemistry is attached and the tap temperature is entered. Corrections create a new line. Nothing is overwritten.
Each entry carries a user and a time. The heat number flows to the ladle, the mould and the casting lot without anyone retyping it, so an auditor sees the full chain on one screen.
Photographs of the spectrometer printout or an imported result file replace the stapled sheet. The original reading and the figure in the record stay in step.
- Required fields before a heat can close
- User and time stamp on every entry
- Corrections kept as new lines
- Spectrometer result attached, not retyped
Close the gaps before the next visit
Take the last ten heats and mark each one against the list above. Count the blanks. That count shows how an auditor would read your book today.
Fix the cheapest gaps first. Use a printed melt card with fixed boxes, initials on every correction and a rule that the card is filled at the furnace, not afterwards.
Then decide whether the card should move onto a screen, so the heat links to moulds and castings without a second book.
Heat log gap check
A one-page audit worksheet with ten rows for recent heats. Columns cover heat number, charge weights present, tap temperature present, pouring time present, full chemistry attached, corrections initialled, link to moulds and link to dispatch. Each cell takes a tick or a cross, and a total row shows the weakest column.
Open a blank worksheet to printQuestions owners ask
Is a bound logbook ever acceptable?
Sometimes, if every field is complete, entries are made at the time and corrections are initialled. The weakness is traceability, since a book cannot join a heat to its castings.
What do customers ask for most often?
The chemistry of the heat, the date, and proof that the castings supplied came from it. Some also ask for charge records and heat treatment charts.
Can we fix old records?
Do not edit them. Add a dated note that explains what is missing, and start the better format from today. Altering old entries is worse than a gap.
Does software remove audit findings?
It removes the avoidable ones, such as blanks and untraceable heats. It cannot fix a melt practice problem, but it shows that problem sooner.