Microstructure, Toughness and Hardness of a Simulated HAZ in Steel S1100QL and of the HAZ of an Actual MAGWelded Joint Made Using a Metallic Flux-Cored Wire

Simulation tests discussed in the article involved structural steel S1100QL having a yield point of more than 900 MPa. The simulations included single (Tmax = 1250°C) and double welding thermal cycle 1250°C + 600°C, Tmax 760°C 900°C) as well cooling times t8/5 3, 5 10 s. Specimens with simulated heat affected zone (HAZ) were subjected to impact strength performed at temperature -40°C +20°C, Vickers hardness (HV10) microscopic metallographic (involving light microscopy). Test results presented diagrams photographs. Related comparisons structural, toughness HAZs analogous obtained during actual repair MAG-welded joint made S1100QL. final part contains discussion concerning test statement obtainment significant conformity phase composition morphology microstructure average values HAZ areas those area welded joint. In relation all tested simulation variants, energy satisfied minimum criterion KV 27 J both that +20°C. number repeated (1 through 4) cycles preset parameters did not trigger explicitly noticeable changes regards