Differences Between Simple Pendulum and Double Pendulum Laser Welding Heads

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.