EN-GJS-500-7 | 5.3200 Production welding

The casting was production welded contrary to the instructions.

Out of curiosity, a tensile specimen was taken from the welded area. The fracture occurred at the visible defect (Rm = 29 MPa, elongation at fracture could not be determined). The fracture surface shows only a few healthy honeycomb fractures, large areas are oxidised or cannot be evaluated. Some blowholes are preserved in the interior of the cross-section. Welding was carried out with a nickel alloy, as the use of an iron filler material would have led to self-quenching and martensite formation due to the high C content of the base material. The fracture occurred mainly along the cast/Ni-base material boundary. The analysed half of the tensile specimen is rich in nickel and shows an austenitic microstructure with small graphite spheres. There are only small remnants of the base material (GJS) directly at the fracture surface, which now show a white colour in the micrograph.