Methods for Welding to produce welded structures with Ultra High Strength Weld metal having excellent Fracture toughness at cryogenic temperature

摘要

It comprises two edges of a base metal to produce a welded structure with a tensile strength of 900 MPa,The TIG Welding (Tungsten Inert Gas Flame) of low calorific consumption is at an energy of Arc 0.3 kJ / mm to 1,5 kJ / mm and a preheating 100ufffdc protector based on Argon gas using a 1% by weight of oxygen and a Consumable Wire for Welding.The welded Structure comprising: (i) a deposited metal has a dbtt (ductile to Brittle Transition Temperature) under 73ufffdc with a microstructure comprising: a) a structure of CRIstal BBC dominated by fine-grained martensite Lath in autotemplada; and (b) a non Metallic inclusion content is low; The deposited metal is Iron Alloy and the following elements:0.06% to 0.1% from 1.6% to 2.05% carbon, Manganese, Silicon 0.20% to 0.32%, 1.87% to 4% Nickel, Molybdenum, 0.56% to 0.40%, 0.30% to 0.87% Chromium, 30 ppm and 50 ppm Sulphur PhosphorusFurthermore comprises an Additive selected from the group consisting of: 0% to 0.30% Copper, 0% to 0.02% Aluminium, zirconium 0% to 0.015% and 0% 001% Titanium; (ii) a Heat Affected Zone (haz); and (iii) portions of the base metal in the proximity of the beam portion of the metal does not coalesce during welding)