Welding with a Fiber Laser

Laser welding is usually done without filler metals so parts need to have good fit with a gap that’s less than 15% of the thickness of the thinnest component. Parts should be relatively clean since welding is very fast with no time to burn-out contaminants. Shield gas is required for more reactive metals but many alloys can be welded in air.

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Laser Welding

Weld heat input and weld shape can be controlled with Laser parameters and optics to generate conduction-mode, penetration-mode and keyhole welds. Conduction-mode welds are rather shallow penetration and wide welds, similar to a GTAW or TIG weld shape.

Penetration-mode welds have a weld penetration that is equal to, or slightly deeper than, the weld width. When using penetration-mode Laser welding the heat input is reduced due to the lower melt volume, thus creating deep penetration low heat input welding from even low average power Lasers.

Benefits of Laser Welding

Laser welding offers numerous advantages over tradition welding techniques such as resistance spot and arc welding.

  • Minimum heat input, resulting in minimal distortion of the component
  • Consistent, repeatable welds
  • Small heat affected zone (HAZ)
  • Narrow weld bead with good cosmetic appearance
  • High strength welds
  • Easily automated


  • High degree of accuracy and control
  • Ability to weld dissimilar materials
  • Generally no flux or filler material required
  • Flexibility of beam manipulation, including fiber-optic delivery
  • Ability to weld in areas difficult to reach with other techniques
  • Often faster than other techniques with greater throughput
  • Versatile (the same tool can be used for Laser cutting and drilling).

Fiber Lasers

Fiber Lasers are an effective way to weld very small parts, commonly used in the engineering, medical and electronics industries. Our research has demonstrated how the excellent beam quality, low power (100 – 200W) continuous wave (CW) Fiber Lasers with modulation consistently achieve high quality spot welds on thin stainless steel foils (20μm – 150μm).

During the trials, a single mode Fiber Laser with Gaussian beam profile produced spatter-free spot welds between 76μm – 175μm diameter. A flat top beam profile, available as an optional feature, achieved spatter-free welds between 150μm and 260μm in diameter.

Our higher powered Fiber Lasers are highly capable of welding thicker materials. For example, the redPOWER 2kW Fiber Laser can weld 8mm low carbon steel and 8mm 316 stainless steel. This heavy duty welding is more suited to applications in the automotive and aerospaces sectors.

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