Stealcom BV ,the first in the world for Laser Joining of SteelAluminium Transition Joints named by ST ST-AL. Steel and Aluminium are the two most widely used metals in constructions however these two materials cannot be joined under normal circumstances because their rosters do not fit each other based on that the melting temperature of steel (1100 degr.C) is much higher than the melting temperature ( 540 degr.C) of Aluminium. The goal of Stealcom after nine years at TU-Twenthe and the BIAS institute in Bremen (alll sponsored by Europian Commitee nr.508091) is the developing and optimize an Nd:TAG Laser process for joining steel to aluminium with material thicknesses up to 8 mm. (patented progress by Stouco Consultance BV).