Mehaničke osobine i brzina rasta zamorne prsline u zavarenom spoju pancirnog čelika

Abstract

Cilj rada je bila izrada kvalitetnog zavarenog spoja pancirnog čelika. Zavareni spoj poseduje dobre zatezne karakteristike, kao i visoku energiju udara u metal šavu i ZUT-u, visoku otpornost na propagaciju prsline u metal šavu i ZUT-u. Osnovni materijal ima najveću zateznu čvrstoću, najnižu energiju udara, najmanju žilavost loma i otpornost na propagaciju prsline. Nakon balističkih ispitivanja ustanovljeno je da ZUT i osnovni materijal poseduju balističku otpornost, dok metal šava ne zadovoljava standarde. Ispitivanjem gasne hromatografije ustanovljena je niska količina difundovanog i zadržanog vodonika u zoni metal šava. U skladu sa tim se zaključuje da su parameteri zavarivanja, kao i dodatni materijal odgovarajuće izabrani. Na osnovu ispitivanja brzine rasta zamorne prsline, određen je preostali vek oklopnih vozila koja se prave od pancirnog čelika.

The aim of this paper was to produce a high-quality welded joint of armored steel. The welded joint has good tensile properties, as well as a high impact energy in the weld metal and HAZ, and high resistance to crack propagation in the weld metal and HAZ. The base metal has the highest tensile strength, the lowest impact energy and the smallest fracture toughness and crack propagation resistance. After ballistic testing, the HAZ and basic metals have been found to have ballistic resistance, while the weld metal does not meet the standards. Gas chromatography analysis detected a low amount of diffused and retained hydrogen in the metal seam zone. It may therefore be concluded that the welding parameters and the additional material have been appropriately selected. Based on the study of the fatigue crack growth rate, the fatigue life of armored vehicles was predicted.