Copper Welding with High‐Brightness Fiber Lasers

Abstract

IPG Laser GmbH is a 100 % daughter company of US-based IPG Photonics Corp., Oxford (MA). IPG Photonics is the world's leading provider of high power fiber lasers and fiber amplifiers for materials processing, telecommunications, medical and other advanced applications. With more than 1200 employees IPG Laser GmbH develops and produces in Germany lasers for a wide range of applications with its three main product lines of industrial low, mid and high power fiber lasers. IPG is the unique provider of high power single mode fiber lasers of more than 1 kW laser power. IPG has a worldwide network of sales, service and applications centers to provide best customer support and solutions. www.ipgphotonics.com CompanyThe consumer electronics and automotive industry are the driving forces for an increased use of copper in industrial processes and products. With the development of new battery technologies and higher battery capacities, the demands to the joining technologies are increasing. While soldering is still the state of the art for low power applications in consumer electronics, it is necessary to apply welding technology whenever high currents have to be transmitted, or high and dynamic loads stress the joints. The e-mobility sector is especially driving this trend and the automotive industry and its suppliers are looking for robust and efficient processes for high volume production in electrical power storage and transmission line applications.Historically, laser technology was limited when welding copper and copper alloys due to the physical properties of the material. Nowadays, with the availability of high power, high brightness fiber lasers these limits can be overcome and with new and adapted processing technologies stable and defect free joints can be achieved in a highly efficient welding process.

Influence of the surface properties of the connector material on the reliable and reproducible contacting of battery cells with a laser beam welding process

“…Highly brilliant fibre lasers have wavelengths in the NIR range, which means that the absorption coefficient for copper is approximately 4% [7]. In contrast to short-wave beam sources, their brilliance is decisive for the successful welding of copper (Fig.…”

Multi-Messenger Radio Frequency and Optical Diagnostics of Pulsed Laser Ablation Processes

“…In this work, the novel technique was applied to perpendicular ablation of both copper and aluminum with 1064 nm wavelength light to investigate its application in a typical scenario. While these materials are highly reflective to light in this range and the plasma plume may occlude the ablation site, 1060-1070 nm laser light is commonly applied top-down in additive manufacturing and laser processing [10][11][12][13][14]. The effectiveness of RES-OES in determining the surface quality and changes in geometry in this scenario is reported.…”

3.8 kW high brightness MOPA fiber laser

“…With the expansion of high-power fiber lasers in the industry area, more requirements have been put forward for more brightness laser outputs. In the fields of metallic glass buttwelding [1], copper welding [2], ultrafast Material Processing [3] and etc, high brightness lasers have achieved good performance. Besides, each increase in high-brightness singlefiber laser power drives up the maximum output power of the combined beam laser.…”