Beyond a Fixed Beam: Why Beam Shape and Sequence Matter
In laser welding, power is only part of the picture. Where the energy goes, and how that distribution changes over time, can be just as important.
A beam that delivers enough energy to achieve penetration may still produce an unstable weld pool or an unsuitable weld profile. Increasing power alone does not necessarily solve these problems. Manufacturers also need control over how the energy interacts with the material.
This is where beam shape and beam sequence matter.
Beam shape controls where the energy goes
Beam shape describes how laser energy is distributed across the area where the beam meets the material.
A concentrated spot delivers energy differently from a ring, an elongated shape, or multiple spots. Changing that distribution gives process engineers another way to influence the molten metal, the keyhole, and the final weld geometry. The keyhole is the narrow vapor cavity that allows the laser to penetrate deep into the material.
Civan Lasers’ Dynamic Beam Laser (DBL) allows users to adjust the beam shape to suit the application. This provides control over energy delivery alongside familiar parameters such as power and travel speed.
Why one shape may not be enough
Welding is a moving process. As the beam travels, material heats up, melts, flows, and solidifies. A beam shape that supports penetration may not provide the best conditions for controlling the flow of molten metal.
A fixed shape requires the process engineer to find a workable balance between these needs.
Beam sequencing adds another option. It allows several shapes to be used in a programmed, repeating sequence during a single welding movement. Civan’s DBL can switch between shapes within microseconds, allowing the sequence to influence the process while the weld is being formed.
Sequence controls how energy changes over time
A beam sequence is more than a collection of shapes. Their order, duration, and switching rate determine how energy is delivered over time.
For example, one shape may concentrate energy to support penetration, while another redistributes it to influence melt flow. Alternating between them gives engineers a way to combine different effects within the same weld.
Research using dynamic beam lasers has demonstrated this approach in high-speed welding. In thick-section welding, a dynamic beam laser can alternate between a single spot and a wider beam shape. The single spot maintains deep penetration, while the wider shape keeps the keyhole open enough to prevent collapse. This sequence helps stabilize the keyhole and control the flow of molten metal.
The lesson is practical: the sequence itself becomes a process parameter.
What this means for manufacturing
Beam shaping and sequencing give engineers more options when developing a welding process. They can explore how to achieve the required penetration while also managing weld geometry and process stability.
This is relevant to applications ranging from thick steel structures to aluminum assemblies and copper components. Each presents different demands, so the beam settings need to be developed and validated for the material, joint, and production conditions.
For manufacturers, the value lies in finding a wider, more reliable operating window. A successful process must deliver acceptable welds consistently under the conditions of the actual application.
Developing the beam around the application
Dynamic beam control expands the questions engineers can ask during process development:
Where should the energy be concentrated?
Which shape supports the required penetration and weld profile?
Could a sequence of shapes improve stability?
How should the sequence change as power or travel speed changes?
These questions move laser welding beyond selecting a power level and a fixed spot.
At Civan Lasers, beam shape and sequence are tools for developing the process around the application. Our application labs work with manufacturers to evaluate these settings on their materials and joints, with the aim of turning process control into practical production value.
From process development to daily operation
The beam shape and sequence are developed in Civan Lasers’ application labs, where our team tests and defines the settings for the customer’s material, joint, and welding requirements.
Once the process is developed, these settings are saved in a welding program. The operator selects and runs the program, without needing to design a beam shape or develop a shape sequence. This keeps daily operation simple while making the developed process repeatable.
