Publication

Laser microspot welding of copper

Thomas Sidler
2004
Journal Articles

Abstract

A new procedure for laser spot welding of thin copper stripes was developed based on measuring the calibrated reflectivity coaxially to the laser beam and using this signal for in situ control of the laser power. Experiments with a power ramp of r=3.1 MW/s were performed on 100-μm-thick commercially available copper stripes of 99.9% purity. The experimental process was divided into four phases: analysis, heating/melting, melt-spreading/welding, and cooling. Overall, results confirm that the new technique allows achieving smaller weld spot diameter without affecting reliability.

Official source

https://infoscience.epfl.ch/entities/publication/de75889f-45b2-4530-92c2-4aee509eaf8a

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Thomas Sidler
2004
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/de75889f-45b2-4530-92c2-4aee509eaf8a

About this result

Related concepts (32)

Laser beam welding

Laser beam welding (LBW) is a welding technique used to join pieces of metal or thermoplastics through the use of a laser. The beam provides a concentrated heat source, allowing for narrow, deep welds and high welding rates. The process is frequently used in high volume and precision requiring applications using automation, as in the automotive and aeronautics industries. It is based on keyhole or penetration mode welding.

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light that is coherent.

Laser diode

A laser diode (LD, also injection laser diode or ILD, or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. Driven by voltage, the doped p–n-transition allows for recombination of an electron with a hole. Due to the drop of the electron from a higher energy level to a lower one, radiation, in the form of an emitted photon is generated. This is spontaneous emission.

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Laser microspot welding of copper

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