When winter cold arrives, many metal fabrication workshops face costly hidden risk: frozen cooling circuits inside fiber laser cutters. Once cooling water freezes, volume expansion can crack chiller tank, pipelines, water pump, even the expensive laser QBH output connector and cutting‑head water channel.
Damage caused by freezing is NOT covered under standard manufacturer warranty. Repair costs can reach thousands of dollars and force long‑term production shutdown. Correct antifreeze handling becomes a must‑do winter maintenance item for fabricators.
When you need to add laser‑grade antifreeze
Add qualified antifreeze if any of these conditions apply to your workshop:
- Workshop ambient temperature drops below 5 °C without stable heating supply.
- Risk of unexpected power failure, cannot keep the chiller running 24‑hours for continuous water circulation.
- Holiday or long‑term shutdown, it is impossible to fully drain all cooling fluid every single time.
Alternative preventive solutions: If power supply is reliable, keep the chiller running non‑stop for water circulation. For long‑idle equipment, drain all coolant completely and blow residual moisture out of pipelines with clean dry compressed air.
Critical Warning: Never use automotive antifreeze
A common costly mistake: many plant operators pour ordinary car antifreeze into laser chiller to save trouble.
Automotive antifreeze contains anti‑rust additives that raise electrical conductivity of coolant. It will corrode laser optical components, rubber seals and fiber laser modules and bring permanent irreversible damage.
✅ Recommended: Industrial laser‑specialized antifreeze such as Clariant Antifrogen‑N
❌ Forbidden: Automobile engine coolant, windshield washer fluid. Alcohol can only be used for very short emergency treatment, not long‑term protection.
Proper mixing ratio & filling operation
Set mixing ratio according to local historical minimum temperature. Do not over‑concentrate, high viscosity will reduce chiller heat‑dissipation performance.
For most cold northern regions, volume ratio suggestion:
Antifreeze : Deionized water = 3 : 7, delivering freeze protection down to approx.‑15 °C.
Operating steps:
- Mix antifreeze and deionized water thoroughly inside an external container before filling.
- Pour pre‑mixed coolant into chiller tank. Do NOT pour pure undiluted antifreeze directly into equipment.
- Power‑on and run full cooling circulation for 5‑10 minutes.
- Inspect all pipe joints for leakage; confirm chiller flow‑rate and temperature readings show no alarms.
Important: Antifreeze cannot be used all‑year‑round
Antifreeze carries mild corrosive properties and is only for low‑temperature winter protection. It cannot permanently replace regular deionized water coolant.
When spring comes and ambient temperature remains steadily above 10 °C with no freezing risk:
- Fully drain all antifreeze liquid out of the whole cooling loop.
- Flush all circulation pipelines using qualified deionized water.
- Refill deionized water as standard production cooling medium.
Additional winter maintenance reminders
- If cooling pipes are already frozen, do NOT start water pump forcibly. Power off and wait for complete natural thaw before troubleshooting inspection.
- Wrap thermal‑insulation sleeves for exposed cooling hoses.
- Make daily inspection for chiller temperature and flow‑rate warning alerts.
Winter anti‑freeze protection is more than simply pouring liquid into the tank. Wrong antifreeze type, improper mixing ratio or skipping spring‑time flushing will create hidden equipment faults. Standardized winter maintenance protects your core laser components, cuts unplanned downtime and stabilizes your production output.
If you need technical suggestions for your laser equipment winter operation, feel free to contact our technical‑support team.
Post time: Nov-05-2026
