How to Choose Power Based on Material Thickness?
Laser power is directly related to welding thickness; the higher the power, the thicker the plates that can be welded. The table below summarizes the single-pass welding thickness capabilities for three common materials (carbon steel, stainless steel, and aluminum) at different power levels:
| Laser Power | Carbon Steel Welding Thickness | Stainless Steel Welding Thickness | Aluminum Alloy Welding Thickness | Key Selection Description |
|---|---|---|---|---|
| 500W | Approx. 2 mm | Approx. 2 mm | Approx. 1.5 mm | Suitable for precision thin plates, jewelry, medical devices, etc. |
| 1000W | 3 - 5 mm | Approx. 3 mm | 2 - 3 mm | Ideal for thin plate processing, such as precision components, advertising letters, kitchen and bathroom equipment, etc. |
| 1500W | 4 - 6 mm | 4 - 5 mm | Approx. 3 mm | The common "workshop warrior," suitable for auto repair and sheet metal fabrication. |
| 2000W | 5 - 8 mm | 5 - 8 mm | 2 - 4 mm | The main model for medium-thick plates, capable of handling auto bodies and 5-8mm steel structures. |
| 3000W | 8 - 12 mm | 6 - 12 mm | 4 - 7 mm | Industrial-grade equipment, suitable for shipbuilding, pressure vessels, etc. |
| 4000W | 12 - 16 mm | 10 - 14 mm | 6 - 9 mm | Used for ultra-thick plate welding in ship manufacturing, heavy equipment, etc. |
Please Note: The thicknesses in the table above are reference values for single-pass welding. Thicker materials can be welded using techniques such as double-sided welding, groove welding, or multi-layer welding. For example, a 1000W device can weld stainless steel up to 5-10mm thick with double-sided welding.
What Other Factors Should Be Considered Besides Thickness?
Looking only at the thickness chart isn't enough. To choose the most suitable equipment, you also need to evaluate the following points comprehensively:
Material Type is Key
Highly Reflective Materials (Aluminum, Copper): These materials have a high reflectivity to lasers and require higher power or lasers with specific wavelengths. Welding aluminum alloys typically requires 30-50% more power than welding stainless steel. For example, welding 3mm aluminum might require equipment with 2000W or more.
Heat-Sensitive Materials: For thin-walled or precision parts, excessive power can lead to burn-through or deformation. In this case, precise power control is needed, or pulse mode should be selected.
Production Efficiency Sets the Lower Limit
Speed Requirements: If you pursue higher production efficiency and need faster welding speeds, you must choose higher-power equipment. For example, when welding 2mm stainless steel, a 2000W device achieves a faster speed (100-120 cm/min) compared to a 1500W device (60-80 cm/min).
Workload Requirements: Estimate based on average daily welding volume: < 50 meters/day -> consider 1500-2000W; 50-200 meters/day -> recommend 2000-3000W; > 200 meters/day -> need to consider 3000-4000W equipment.
Leave a Power Margin
It is recommended to choose a power level that is 20-30% higher than your current calculated minimum requirement. This not only handles unexpected high-difficulty tasks but also prevents the equipment from operating at full load for extended periods, which is beneficial for extending its lifespan.
Welder Skill and Joint Design
Experienced operators can achieve greater penetration depth by adjusting parameters. Additionally, different joint types (butt joints, lap joints, etc.) and the workpiece's fit-up gap can influence the required power.
Summary and Action Suggestions
Thin Plate Processing (<2mm): Consider models with 1000W or less.
General Sheet Metal, Enclosures (2-4mm): 1500W offers a good balance of performance and cost.
Medium-Thickness Structural Parts (4-8mm): Such as steel structures and auto parts, recommend 2000W models.
Thick Plates, Highly Reflective Materials (>8mm): Such as for pressure vessels and shipbuilding, require 3000W or higher power.
