Maximum Efficiency: 4-10x faster than traditional TIG/MIG welding.
Deep Penetration: Stably welds up to 11mm Stainless Steel and 12mm Carbon Steel.
24/7 Operation: Integrated industrial water chiller for continuous high-load industrial use.
The 4000W laser welding machine is an advanced laser welding device that requires no external gas supply. It incorporates a built-in high-purity inert gas self-generation system, enabling stable, high-quality welding without the need to purchase or connect additional gas cylinders. This device supports welding carbon steel, stainless steel, and aluminum plates ranging from 0.5 to 12 mm thick, achieving weld beads up to 8 mm wide with deep penetration. It enables single-sided welding with double-sided formation, producing spatter-free results that reduce secondary grinding work.
It is a thick-metal laser welding machine, featuring a spatter-resistant black-gold welding torch and dual-protection lenses to minimize contamination and wear during operation. Its stepper four-drive wire feeder supports seamless switching between single, dual, and triple wire feeding modes, enhancing weld bead width and fullness. It can even achieve weld bead buildup, delivering more stable and precise weld quality.
Take a closer look at our 4000W laser welding machine from every angle. From the body, handheld welding torch, and internal layout, every component is high-quality.
The 4000W Air Laser Welding Machine reliably welds plates ranging from 0.5 to 12 mm thick, making it widely applicable for common industrial metals such as stainless steel, carbon steel, and aluminum alloys. Tailored to diverse material properties and process requirements, the equipment delivers deep penetration welding with high efficiency and consistent results.
Suitable for 0.5–12 mm thicknesses, producing smooth weld bead formation with minimal heat-affected zone, ideal for structural components and pressure vessel applications.
Suitable for 0.5–12 mm thicknesses, delivering stable penetration depth and high strength, suitable for construction machinery and steel structure fabrication.
Suitable for 0.5–8 mm thicknesses, effectively controlling porosity and distortion to achieve uniform, dense welds.
For thinner materials under 4mm, you might consider our Air-Cooled Handheld Laser Welding Machine for maximum portability
The working principle of the air laser welding machine is “laser energy welding + self-generated shielding gas protection.”
The equipment generates high-purity inert shielding gas via a precision gas generator. Combined with a multi-stage vortex-collision separation filtration system imported from South Korea, it ensures pristine gas purity, eliminating the need to purchase additional welding gas. Kempson customized chip and an American GW laser nitrogen generator systems produce a highly concentrated laser energy.
This energy is precisely directed to the welding site through a multi-rotation anti-spatter welding torch, instantly melting the base metal and filler wire to form a robust weld. Simultaneously, under the stable control of the French Schneider electrical control system, the stepper four-wheel drive three-plus-one wire feeding mode adapts to plate thicknesses ranging from 0.5 to 12 mm. Single-sided welding achieves double-sided formation, while the protective gas synchronously isolates air to prevent weld oxidation. This ultimately delivers spatter-free, low-consumption, highly efficient, and stable welding results.
Measuring just 1.2 × 1.3 × 1.3 meters, the 4000W laser welder features a compact footprint that fits easily into any workshop without occupying excessive space, while its built-in gas generation system eliminates the need for external shielding gas, making it convenient, efficient, and ready for use. Check out the dimension diagram below for a detailed view of its size and layout.
| Model | KPS-ALW4000 |
|---|---|
| Laser Power | 4000W |
| Fillet Weld Thickness (Stainless Steel) | 11mm |
| Fillet Weld Thickness (Angle Steel) | 12mm |
| Fillet Weld Thickness (Aluminum Alloy) | 10.5mm |
| Automatic Wire Feeding | Φ0.8-2.0 |
| Wire Feeding Mode | Automatic wire feeding (Single, double, and triple wire switching) |
| Weld Bead Width | 1.5～8.0mm |
| Maximum Penetration Depth | 7.5mm |
| Total Power Consumption | ≤3.5kW |
| Cooling Method | Built-in water cooling |
| Chiller Power | 18000W |
| Power Requirements | 380V |
| Equipment Dimensions | 1.2*1.3*1.3m |
| Equipment Weight | ≈585kg |
| Self-Supplied Gas Type | 99.99% Argon/Nitrogen gas |
| *The handheld welding head comes standard with a 10-meter fiber optic cable, allowing for flexible and convenient long-distance welding outdoors. | |
The black gold laser welding gun specially developed by Kempson utilizes multi-rotation reusable protective lenses, a dedicated anti-spatter welding nozzle and gun tube, and a dual protection system with a high-temperature alarm device, effectively reducing subsequent consumable costs. In contrast, most competitors choose to equip their systems with inexpensive welding guns with easily damaged lenses, leading to frequent lens replacements and significantly impacting production efficiency.
This machine is suitable for welding carbon steel, stainless steel, and aluminum materials ranging from 0.5 to 12mm thick. It achieves smooth, strong, and spatter-free welds on various metals, finding extensive application across multiple industries, including heavy machinery, metal fabrication, automotive components, and structural steel. The following images demonstrate different welding types and the machine’s welding results on various equipment.
For thinner materials or higher portability, check our [Air Laser Welding Machine 1500W/2000W/3000W].
The 4000W thick plate air laser welding system, characterized by its gas-free operation, flexible handling, and high welding efficiency, is widely adopted across industries including heavy-duty construction machinery components, mining equipment frames, container body welding, steel structure building components, heavy truck chassis, and large agricultural machinery. It meets the low-cost welding demands for various thick-walled metal plates while balancing operational convenience and weld strength.
Kempson is a 4000W air laser welding machine manufacturer and supplier in China, specializing in the R&D, production, sales, and service of thick-plate laser welding solutions. Our company possesses an in-house R&D team and extensive industry experience, with over 30 patented technologies and certifications, including ISO9001, CE, and FDA.
We provide a global service network and attentive after-sales support, offering customers a three-year warranty on complete machines and complimentary direct shipping of antifreeze for extremely cold production areas, with rapid response to technical needs. The company is committed to delivering efficient and reliable thick-plate laser welding solutions for global industrial manufacturing through innovative technology and comprehensive after-sales service. Contact our professional team to obtain customized welding solutions and technical support.
The 4000W model offers significantly greater penetration depth, allowing for efficient welding of thick plates up to 12mm. It provides faster welding speeds and a more stable arc for heavy-duty industrial applications compared to 1500W or 2000W models.
Yes. It features an integrated high-precision gas filtration and generation system that converts ambient air into 99.99% pure shielding gas, saving significant costs on gas procurement and logistics.
It is ideal for thick-plate welding of stainless steel, carbon steel, aluminum alloys, and galvanized sheets. It is particularly effective in industries like shipbuilding, steel structures, and heavy machinery manufacturing.
The machine is designed with industrial swiveling casters and a robust chassis, making it mobile within a workshop environment. It also comes with a 10-meter fiber optic cable for flexible operation over long distances.
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