Uneven Fiber Laser Welds ｜ Causes and Practical Solutions

Uneven fiber laser welds, poor surface finish, or burn marks are often caused by incorrect parameter settings, insufficient surface preparation, or improper shielding gas usage. This article explains the root causes, provides effective solutions, and introduces a fiber laser welding machine designed to significantly improve weld quality for industrial factories.
■ Characteristics of Uneven or Poor Welds
Common issues encountered in fiber laser welding (ไฟเบอร์เลเซอร์เชื่อมโลหะ) include:
・ Wavy or discontinuous weld lines
・ Burned edges with inconsistent coloration
・ Rough weld surfaces with spatter or porosity
・ Collapsed or distorted welds
・ Excessively thick or thin welds
■ Main Causes of Uneven Fiber Laser Welds
1. Improper Laser Power Settings
・ Too little power → incomplete penetration
・ Too much power → burns or porosity
✔ Adjust laser power, frequency, and pulse duration according to material thickness
2. Welding Speed Mismatch
・ Too fast → discontinuous welds
・ Too slow → overheating, burns, distortion
3. Material Quality and Surface Condition
・ Presence of oil, dust, or oxide layers reduces consistent energy absorption
4. Incorrect Laser Beam Focus
・ Even slight focal misalignment can cause uneven weld beads
5. Improper Shielding Gas (แก๊สป้องกัน)
・ Wrong type (N₂, Ar) or insufficient flow rate causes oxidation, porosity, and discoloration
■ Solutions for Smooth and High-Quality Welds
✅ Optimize laser parameters for each material and thickness
✅ Ensure clean surfaces (polishing or alcohol wipe) before welding
✅ Use autofocus or precise adjustment for laser beam focus
✅ Set proper shielding gas type, flow, and nozzle angle
■ Why Choose the FLW-1500MT Fiber Laser Welding Machine
For factories struggling with uneven welds, poor appearance, or difficulty maintaining welding quality, the FLW-1500MT is an advanced solution.
・ 1,500 W power ensures high precision and deep penetration
・ Wobbling function enables adjustable weld bead width for different joints
・ Suitable for both thin and thick plates in one system
・ Reduces operator errors, increases flexibility, and delivers consistent weld quality
This model from AMADA (THAILAND) CO., LTD. is ideal for Thai factories looking to improve efficiency, reduce defects, and raise welding standards in production.
■ For more details, please refer to the PDF or contact us directly.
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