Relationship between the weld metal ultimate tensile strength and real rupture strength and alloying and thermal cycle of welding

Regressive models are obtained on the base of statistical processing of a great volume of experimental data. Effect of alloying elements, impurities, and thermal cycle on ultimate tensile strength and real rupture strength in the processes of arc welding of low-alloy steels is analyzed. It is shown that additional alloying with carbon, manganese silicon, and chromium increases considerably weld metal ultimate tensile strength. Carbon, manganese, and chromium can not only increase but also decrease a weld metal σsub(v). Molybdenum and vanadium increase essentially both ultimate tensile strength and real rupture strength. Nickel produces the same, but weaker effect. Nitrogen simultaneously increases ultimate tensile strength. σsub(v) and Ssub(k) (real rupture strength) sensitivity to welding thermal cycle is reinforced in enhanced content of basic alloying elements