Issue 47

K. Hachellaf et alii, Frattura ed Integrità Strutturale, 47 (2019) 459-467; DOI: 10.3221/IGF-ESIS.47.36 462 Figure 5: Geometry of the tools. Tool type Process parameters Welding quality Welded cord Pin profile: cylindrical (T1) Rotation speed N (rpm) Advance Speed a (mm/min) Test N° 1 875 24 Welding correct 2 40 Regular cord 3 1750 24 Bad Welding 4 40 Cracked cord 5 720 24 Bad Welding 6 40 Bad Welding Table 3a : Welding process parameters The material used for welding tools is ordinary steel. These tools are suitable for friction welding FSW of HDPE plates. They are able to perform the three main welding functions [13, 14]: - Heat the parts by friction and by plastic deformation,