What are Autogenous and Nonautogenous Laser Welding?

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- GoPhotonics

Nov 14, 2023

Autogenous Laser Welding

Autogenous laser welding is a welding process where the laser beam is used to create the weld joint without the addition of any filler material. In this technique, the laser beam generates intense heat at the joint between the workpieces. As the laser moves along the joint, the molten materials solidify, forming a weld seam. Autogenous welding is typically used for materials that can be easily welded without the need for additional filler, such as certain types of steel and aluminum alloys. This method often results in high-quality, precise, and narrow weld seams. It offers minimal distortion and can weld complex geometries.

Autogenous laser welding is further divided into conduction mode and keyhole mode, with the distinguishing factor being the intensity of the laser (measured in W/cm2). Various process conditions influence whether the welding occurs in conduction mode or keyhole mode. These modes are distinguished by the laser's power density or intensity in relation to the scan speed across the workpiece.

Nonautogenous Laser Welding

Nonautogenous laser welding is the type of laser welding process that involves the use of an additional filler material to create the weld joint. In this technique, the laser beam heats the workpieces and the filler material simultaneously. The filler material, usually in the form of a wire or powder, is fed into the weld pool created by the laser. As the filler material melts and fuses with the workpieces, it forms a strong weld joint. Nonautogenous laser welding is used when the material being welded requires the addition of filler material to achieve the desired weld characteristics, such as improved strength, ductility, or corrosion resistance. This method is versatile and can be applied to a wide range of materials and thicknesses.

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