This technical report outlines the advancements made by CooolCase, a contract manufacturer based in Dresden, in the laser welding of aluminum housings for inverters. The report details the company's transition to using the TruLaser Weld 5000 system, which has significantly improved production efficiency and reduced material usage. CooolCase has leveraged its expertise in case construction to meet the rising demand in the solar industry, where the need for cost-effective and leak-proof enclosures is critical. The report describes the complex welding processes involved, including heat conduction welding and deep penetration welding, which are essential for ensuring the durability and reliability of the inverter housings. Additionally, it highlights the challenges faced during the welding of different aluminum alloys and the innovative solutions developed in partnership with TRUMPF. The report concludes with a forecast of increased productivity, noting that CooolCase has scaled production from two to one hundred components per day, showcasing the successful implementation of laser technology in their manufacturing processes.