Method of welding and heat treatment of the welded joint of sheets made of low-alloy, wear-resistant steel with boron

摘要

The welding and heat treatment method combines the welded plate of Brinar 400 of low-grade, high-grade steel with boron, as shown in the drawing in which the low-grade plate,a sheet with a thickness of 6 to 12 m m and expressed by the percentage of the chemical composition by the weight of the chemical composition: C -0,16,0 0,18; S i -0,0,22,0 0 0 0,22,0,25; Mn -1,10 10 10 10 10 10 10,P maxmax 0015; S maxmaxmaxmax0005; S maxmaxmaxmaxmaxmaxmaxmaxmax0005; C C -0,30,30 0,6060; Ni -0,16,38 0,38; Mo Mo Mo -00,18 0,18 0,0 0 0,0,0 0 0 0,30 0 0 0 0,30 0,30 0 0 0 0 0 0 0 0 0 0,10 CEV coal? 0,58, complies with the MAG method (135),step in proportion: 9,11% G3Si1 in accordance with EN ISO 14341-A and 89,91% GMn4Ni2CrMo in accordance with EN-ISO standard 16834-A using welding parameters: speed v? 5 mm/s; rated arc current I = 90-160 A; arc voltage U = 15-22 V; linear energy Q? 1,0 kJ/mm; the interlayer temperature of Ti 250-oC; the flow of the protective gas in the form of a mixture of Ar +18% CO2, released in the quantity of 15 l/min, is characterised by the fact that the welded compounds obtained are normalised by austenitisation at 900/920'C temperature by 60-min with free air cooling;After hardening by austenizing at temperature 920,930'c by 15'20 mines and then cooling in hot water? 30oC; and cooling at 150oC temperature by 120 mines after which the welded joints are cooled in the air.