Keyword: «mechanical properties»

The article presents the results of a study on multi-pass welded joints made at subzero and ambient air temperatures. Experimental multi-pass welding of low-alloy bridge steel 10HSND (Grade 3) was performed using WN 62U electrodes with registration of the welding thermal cycles. The research results confirm the possibility of producing high-quality welded joints in 10HSND steel under subzero temperature conditions without significant degradation of its performance characteristics.

The article presents the results of studies on the microstructure and mechanical properties of weld metal modified with a natural concentrate of rare-earth elements from the Tomtor rare-metal deposit. It is shown that the structural changes that occur when a complex modifier is added into the charge of coated high-strength ANP-2 type E70 electrodes lead to a 15% increase in the impact toughness of the weld metal at positive test temperatures, and a 50% increase in the test range from –40 to –60 °C.