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Laser soldering

Laser soldering enables substance-to-substance bonds. The laser can be focused with high accuracy. This means that even the smallest soldered joints and sensitive electronic components can be connected. The technology is also frequently used in the automotive industry or in the electronics sector.

What is the technology behind the laser soldering?

Laser soldering is a non-contact process: the laser beam heats up the solder. This is then introduced to the process as a filler wire, which usually consists of copper or zinc alloys. The solder then melts and fills the joint gap. The melt fuses the two components.

The two processes of laser soldering technology:

  1. Hard soldering using a laser at melting temperatures above 450 °C:
    This joining technique uses diode lasers with higher power and is used primarily in the automotive industry.
  2. Soft-soldering using a laser at melting temperatures below 450 °C:
    This technique is commonly used in the manufacture of electronic components.

Automated laser soldering

As a KUKA customer, you have two options:

  • Automated and scalable production systems
  • Individually configured manufacturing cells


Parameters such as path velocity, laser power or optimum wire feed are second nature to us, and we offer various technology packages for different production scenarios.

Laser soldering in the process

What advantages does KUKA laser soldering offer?

  • Top performance

    • High process speed
    • Minimum heat input
    • Temperature control of the soldered joint
    • Low component distortion
  • Diversity

    • Soldering of sensitive and dissimilar components
    • Wide range of robots for applications in different industries and sectors
    • Robotic (cell) solutions with system partners
  • Know-how & service

    • Years of process expertise
    • Own gripper for soldering of the roof seam
    • Custom-tailored process solutions
  • Quality

    • Paintable seams, without reprocessing work
    • Fewer restrictions due to zinc coating
    • Possibility of seal welds
    • Harmonious component transitions at visible seams
    • Gap compatibility
    • No structural change
    • High strength of the workpieces


With a payload of 120 to 240 kg, the versatile robot automates your laser soldering process.

E-book: Welding aluminium? No problem!

Aluminium and aluminium alloys play an important role in e-mobility because of the ideal combination of lightness and strength. In welding and joining processes, aluminium has high demands on the processes used. With comprehensive process know-how and the right products, we make you fit for the technological transformation towards e-mobility. The example of the battery box shows how robots enable the production of aluminium components at the highest quality level;

Read what is important for aluminium welding in electromobility.

Download e-book

Do you want to optimize your laser soldering process?

We will create the right laser soldering process for you and together we will find the ideal solution for your specific requirements.

More information about technologies using lasers

With KUKA, laser applications mean automation, accuracy and significant process improvement.
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Find more details about our laser technologies in the brochure.

Download here