Single SwingWelidng vs. Double Swing Welding – How to Choose? Handheld Laser Welder Machine
When selecting a handheld fiber laser welder machine, understanding the differences between single swing and double swing (also known as single pendulum and double pendulum) is essential for achieving optimal welding performance.
During the welding process, the laser beam irradiates the material surface, causing it to rapidly melt and form a molten pool. Within this pool, the two materials fuse together and quickly cool under coaxial gas protection, completing the weld. Traditional non-oscillating welding relies on the natural fluidity of the material for fusion. However, when the seam width exceeds 0.15mm, the liquid in the molten pool does not have enough time to fully fuse, and the material temperature drops rapidly, leading to defects such as porosity, pits, and cracks. Therefore, for wide seam welding, thick plate welding, or welding of highly reflective materials, oscillating welding becomes a superior choice.
Why Is Wobble Needed in Welding?
In laser welding, the complete fusion of the molten pool is critical for determining weld quality.
For narrow gaps (≤0.15mm): The material’s natural fluidity allows the molten metal to fuse seamlessly, forming a uniform weld without requiring wobble .
For wider gaps (>0.15mm): The liquid metal in the molten pool struggles to fully merge, and the rapid temperature drop increases the likelihood of defects such as lack of fusion, porosity, and shrinkage cavities.
Advantages of Wobble Welding
Increases molten pool size: Oscillation expands the molten pool’s coverage, improving material fluidity and ensuring more uniform fusion.
Reduces welding defects: Effectively minimizes the risk of cracks, porosity, and lack of fusion, enhancing welding strength.
Improves welding speed: By achieving more uniform heat input, oscillation enables faster welding speeds and higher production efficiency.
Differences and Applications of Single Swing vs. Double Swing Welding
- Single Swing Welding
Principle: The laser beam oscillates in one direction (usually transverse or longitudinal), forming a linear or arc trajectory.
Advantages:
Suitable for thin materials (≤3mm) and welding tasks with narrow gaps.
Effectively improves weld stability and formation quality.
Meets most application needs when the weld gap width is not a major concern.
Typical Applications:
Thin stainless steel and carbon steel welding.
Precision electronic components and hardware parts welding.
Suitable for materials with a weld gap width ≤0.15mm.
- Double Swing Welding
Principle: The laser beam wobbles in two directions simultaneously (typically along the X and Y axes), forming figure-eight, circular, or spiral trajectories, effectively expanding the molten pool coverage.
Advantages:
Suitable for thicker materials (≥3mm), especially for workpieces with wider gaps.
Provides more uniform heating, reducing thermal stress and crack risks.
Enables faster welding speeds, deeper penetration, and enhanced weld strength.
Typical Applications:
Steel structures, automotive parts, and pipeline welding.
Welding of highly reflective materials such as aluminum alloys and copper.
Suitable for materials with a weld gap width >0.15mm.
How to Choose Between Single Swing and Double Swing?
- Based on Material Thickness
Thin materials (≤3mm): Single swing welding is sufficient for achieving the desired weld quality.
Thick materials (≥3mm): Double swing welding is recommended for deeper penetration and stronger welds.
- Based on Weld Gap Width
Gap ≤0.15mm: No oscillation is needed, or single swing welding is sufficient.
Gap >0.15mm: Double swing welding is preferred to ensure full fusion and prevent welding defects.
- Based on Material Type
Stainless steel and carbon steel: Both single and double swing welding can be used; thickness determines the oscillation method.
Aluminum alloys, copper, and other highly reflective materials: Double swing welding is recommended for improved weld quality.
Conclusion
Single Swing Welding: Best for thin materials (≤3mm) and narrow-gap welding.
Double Swing Welding: Ideal for thicker materials (≥3mm) and wide-gap welding, effectively minimizing welding defects.
Please feel free to contact us if you are still not clear which is better suitable for you. We support free demo!
