Abstract
The article presents the results of analytical studies of the effect of the chemical composition of certain grades of steel wires on the weldability parameters and mechanical properties of the deposited metal. It is shown that wires for welding low-carbon, low-alloy high-strength steels are made mainly of silicon-manganese-based steels with the addition of nickel, molybdenum and chromium. To improve the metal characteristics of wires and welds, microalloying components such as titanium and vanadium are added to the basic steel compositions. It has been established that wire steels according to the parameters UCS < 30 and HCS < 4 are not prone to the formation of hot cracks during welding. The assessment of crack resistance based on the parameters of the carbon equivalent Ceqv > 0.45 and the index Pcm > 0.23 showed the tendency of the steels under consideration to cold cracks during welding. This is primarily due to the complex chemical composition of the steels, which provides the necessary set of mechanical properties of the welded joints. An assessment of the strength properties of the deposited metal obtained using a promising wire showed that the value of the temporary resistance reaches 1079 MPa, and the yield strength is at the level of 788 MPa. The predicted level of strength properties exceeds those regulated by AWS A5.18 and EN ISO 14171-A standards by about 1.6 – 2 times.
Keywords:
welding, surfacing, welding wire, weld, weldability, crack resistance, carbon equivalent, mechanical properties