Abstract
Welding of armored steel is complicated by the high percentage of carbon in the base metal, the presence of faults in the form of cracks and pores that occur in the weld metal and heat affected zone (HAZ) during the welding process. For heavy structural engineering such as military armored vehicles that are frequently under the influence of impact loads, it is important to know the fracture toughness in all zones of the welded joint. The crack formed in base metal or HAZ, due to dynamic or impact loads, can easily continue to propagate to the fusion line, after which its accelerated growth may occur. The fracture mechanics testing was applied to SEN (B) test specimens, which investigated cracks initiation and certain fracture mechanics parameters. Due to the significant interest in quantifying the resistance of material to propagation of cracks, the fracture mechanic was measured in the zone of base metal, weld metal and HAZ, at temperature 20 °C. The fracture toughness in the base metal is 86.1 MPa*m1/2, while in HAZ and weld metal zones is 286 MPa*m1/2 and 355 MPa*m1/2, respectively.
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