In the Thesis work "New method for quality inspection of extrusion welding" has developed a new aluminum profile extrusion quality inspection method for extrusion welds tests and defect identification. The New method allows to increase productivity and it has been launched in production since 2012. Instead of tensile and compressive methods offers a new aluminum profile quality inspection method. With experiments and FEA and FEM was analyzed the metal shearing process. Experimentally was developed applicable diagramm "Extrusion seam weld limit diagram (ESWLD)" to predict what kind of extrusion form dimension at extrusion process in extrusion welding chamber avoids the presence of gas chambers.