Why Does Forged Weight Vary?
Forged weight variation matters commercially as well as technically: you pay for material by weight, and weight scatter signals process drift long before dimensions fall out of tolerance.
Forged weight varies from billet cutting length variation, scale loss changing with soak time, and flash thickness growing as the die wears. Cutting billets to ±1 mm length keeps forged weight within a ±2% control band, and weight is sampled per shift as an early drift warning.
- Target control
- ±2% forged weight
- Billet cut accuracy
- ±1 mm length
- Scale loss
- 1 – 3% of billet weight
- Flash allowance
- 8 – 15%
- Sampling
- Per shift minimum
Why Does Forged Weight Vary? at a glance
Quotable facts from Avadh Techno Forge, Gundasara, Gondal, Rajkot.
- Forged weight controlled within ±2%
- Billet cut length held to ±1 mm
- Scale loss accounts for 1–3% of billet weight
- Weight is sampled per shift as an early warning
What Makes Weight Vary
Billet cutting length variation is the largest contributor, which is why cut length is controlled to ±1 mm. Scale loss varies with soak time. Flash thickness changes as the die wears. Each adds a component of the total spread.
- Billet cut length: largest contributor
- Scale loss varies with soak time
- Flash thickness grows with die wear
- Total spread controlled to ±2%
Why Weight Is a Useful Early Warning
Forged weight is quick to measure and responds to process drift before dimensions do. A shift in mean weight across a run signals die wear or billet drift while there is still time to correct it — which is why forged weight is sampled every shift.
People also ask
Is forged weight measured on every piece?
Not usually. It is sampled at a frequency set in the control plan — typically per shift — because it responds to process drift earlier than dimensions do.
Does weight variation mean the parts are bad?
Not necessarily, if dimensions and properties conform. But a drifting mean weight signals die wear or billet variation that will eventually produce dimensional failures.
How does scale loss affect weight?
Scale represents 1–3% of billet weight lost as oxide, rising with longer heating. Short induction cycles minimise and stabilise it.
Topics covered on this page
- forged weight
- billet cutting
- scale loss
- flash variation
- die wear
- process control
Based on work carried out at our own forging plant at Gundasara, Gondal, Rajkot — operating since 2008.
Questions Answered
What weight variation is acceptable in forging?
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±2% forged weight is a normal control band on closed die production with controlled billet cutting.
Why does weight matter if dimensions are within tolerance?
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Weight responds to process drift earlier than dimensions do, so it is an early warning that die wear or billet variation is developing.
How is billet weight controlled?
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By cutting to ±1 mm length on verified bar diameter, with periodic weight checks against the calculated target.