When choosing a laser welding machine, many customers often face an important question:
Should I choose a Simple Pendulum welding head or a Double Pendulum welding head?
These two technologies directly affect welding performance, application range, and equipment cost. Below, we will explain the differences from three aspects: working principle, performance, and application scenarios.
1. What is Simple Pendulum and Double Pendulum?
1. Simple Pendulum
A Simple Pendulum welding head means the laser head has only one oscillation axis (usually X-axis). During welding, the laser beam moves back and forth in one direction.
Simply put:
It oscillates in one direction, such as left-right or up-down.
2. Double Pendulum
A Double Pendulum welding head is equipped with two oscillation axes (X-axis + Y-axis), allowing multi-directional composite movement.
Simply put:
It can oscillate in both directions simultaneously, forming more complex patterns such as circles or figure-8 shapes.
2. Key Differences
1. Welding Performance
Simple Pendulum:
Narrower weld seam
Simpler molten pool control
Higher requirement for joint accuracy
Double Pendulum:
Wider and more uniform weld seam
Better gap bridging capability
More stable and aesthetically better welding results
Conclusion:
For higher welding quality requirements, Double Pendulum is the better choice.
2. Gap Tolerance
Simple Pendulum: Suitable for high-precision joints with small gaps
Double Pendulum: Can handle larger gaps and irregular joints
In practice:
If the workpieces are not perfectly fitted, Double Pendulum is more reliable.
3. Welding Strength and Stability
Simple Pendulum: Concentrated energy, suitable for thin and precise welding
Double Pendulum: More evenly distributed energy, stronger and more stable welds, less risk of weak fusion
4. Function Flexibility
Simple Pendulum: Basic functions, simple settings
Double Pendulum: Supports multiple oscillation patterns, such as:
Circular pattern
Elliptical pattern
Figure-8 pattern
Spiral pattern
Advantage:
One machine can handle a wider range of welding processes.
5. Equipment Cost
Simple Pendulum: Lower cost, cost-effective
Double Pendulum: Higher cost due to more complex structure
However:
Double Pendulum can reduce rework and labor cost, making it more economical in the long run.
3. Application Recommendations
Choose Simple Pendulum if:
✔ Thin sheet welding
✔ Precision parts
✔ Small and well-controlled gaps
✔ Limited budget
Choose Double Pendulum if:
✔ Stainless steel, aluminum, or high-quality welding requirements
✔ Workpieces with gaps or uneven joints
✔ High weld appearance requirements
✔ Multiple materials or multi-process applications
4. Conclusion
In simple terms:
Simple Pendulum = Basic, economical choice
Double Pendulum = Advanced, more flexible and higher quality
If your goal is stable production, reduced manual adjustment, and improved welding quality,
Double Pendulum welding heads are the more valuable long-term investment.
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