Hebei Juliang Technology Co., Ltd. is one of the leading manufacturers and suppliers of water cooled fiber laser welder in China. Please feel free to buy CE approved machinery made in China here from our factory. All customized machines are with high quality and competitive price.

Product Definition

A water-cooled fiber laser welder is a system that employs a fiber laser and a closed-loop water circulation to manage heat during operation. It produces a 1080nm wavelength beam, which is sent via an optical fiber cable to a handheld welding head. This beam can be focused to a spot size from 0.2mm to 2.0mm, creating enough power density to melt metal where two pieces join. The deionized water circulating in the cooling loop runs through the laser source, optics, and welding head, keeping the temperature within 1°C of the target. This steady temperature allows for continuous high-power output at 100% duty cycles and ensures uniform weld depth throughout long production runs.

Cooling System Architecture

The water cooling system operates on a closed-loop principle. A pump moves deionized water through the laser source, optical parts, and welding head. This water absorbs heat from the laser diodes and optics. Next, the warm water goes to a chiller. Here, a refrigeration system transfers the heat to the surrounding air using a condenser and fan.

Chiller breakdown: The chiller includes a compressor, condenser, expansion valve, evaporator, and a circulation pump. It can provide 3kW of cooling for 1000W systems and up to 6kW for 3000W systems. The chiller usually runs on 220V single-phase power, separate from the laser's power source.

Water must be deionized, with conductivity under 5μS/cm. Regular tap water has minerals that build up inside, making the system less effective over time. We add corrosion inhibitors to safeguard the copper and aluminum parts in the cooling loop.

Precise temperature: The water is kept at a steady 25±1°C, even if the room temperature goes up to 40°C. Temperature sensors feed data to the chiller's controller, which adjusts the compressor and fan speed to keep things stable.

Water Cooled vs Air Cooled – Technical Comparison

Deciding between water-cooled and air-cooled fiber laser welders boils down to key differences that impact your production output.

Cooling Power: Water is much better at absorbing and moving heat than air (about 4 times the specific heat capacity and 25 times the thermal conductivity). This allows water-cooled units to run hotter and for longer stretches without overheating.
Temperature Control: Water-cooled setups keep temperatures steady within ±1°C. Air-cooled ones can vary by ±3–5°C depending on the room temperature. This consistency is crucial for even weld depth throughout a production run.
Top Power: You can get water-cooled systems up to 4000W, while air-cooled ones usually max out at 1500W because they struggle to get rid of excess heat.
Continuous Operation: Water-cooled systems can run at full power 100% of the time. Air-cooled systems tend to overheat and need to reduce power after a while, typically operating at 60–70% duty cycle at maximum output.
Setup: Water-cooled units need a chiller, water hookups, and plumbing. Air-cooled units just need power and a gas line.
Upkeep: Water-cooled systems need regular checks on water quality, filter changes, and occasional coolant replacement. Air-cooled units just need their fins cleaned.
Size & Movement: Air-cooled welders are lighter (80–150kg) and easier to move. Water-cooled units are much heavier (250–400kg with the chiller) and usually stay put.
Running Costs:Air-cooled systems use less electricity because they don't need a chiller. Water-cooled systems use more power, but their higher production speed can often make up for the extra cost.

Our Service Processes

Raw material inspection → Steel plate cutting → Bed frame welding → Stress relief heat treatment → Gantry milling of mounting surfaces → Sub-assembly of components → Optical alignment → System integration → Calibration → 48-hour burn-in test → Chiller system verification → Functional testing → Packing → Shipment

Common Problem

Can I weld dissimilar metals with this machine?

Yes, fiber lasers can weld combinations such as copper to aluminum, steel to stainless steel, and aluminum to steel. Parameter optimization is required-different melting points and thermal conductivities affect weld formation. Test on sample material before production.

What is the expected service life of the water pump?

Pump life depends on duty cycle and water quality. With proper maintenance (clean water, no debris, regular filter changes), pumps typically last 3–5 years in continuous production. Signs of pump failure include unusual noise, low flow rate, and fluctuating pressure.

What are the signs of coolant degradation?

Cloudy appearance, visible particles, or color change indicate contamination. Gradual reduction in cooling efficiency suggests scale buildup. Regular conductivity testing (target <5μS/cm) identifies degradation before problems occur. Replace coolant immediately if contamination is visible.

How do I know when the protective window needs replacement?

Inspect daily. Visible spatter, pitting, or crazing on the window surface indicates replacement is needed. A dirty window reduces weld penetration. If the window appears cloudy or has visible marks, replace it immediately. Replacement cost is small compared to focusing lens damage.