The article presents the use of low-energy and standard welding methods (CMT and MIG-Pulse) for joining elements made of hard-to-weld 6xxx series aluminium alloys as well as the course of technological tests aimed at the determination of the usability of the CMT and MIG-Pulse methods for welding butt joints made of 2.0 mm thick sheets. The work also discusses the basic difficulties related to welding 6xxx series aluminium alloys, presents the specific character of welding by means of “typical” and low arc energy methods as well as presents the selected results and analysis of macro/microscopic metallographic tests and strength tests of the welded joints. The authors indicate that CMT welding ensures high quality and aesthetics of welded joints made of aluminium alloys regarded as difficult to weld.