摘要:
A heat input control method for a welding system includes the step of receiving data encoding a desired heat input range having heat input values included between an upper limit and a lower limit. The method also includes the step of receiving data encoding a desired change to a level of a first weld variable of a set of weld variables. Further, the method includes determining a change to a level of a second weld variable of the set of weld variables. The determined change to the level of the second weld variable is suitable to maintain a heat input of a welding operation within the desired heat input range.
摘要:
This weld metal is welded by submerged arc welding, has stable, superior toughness and superior SR-cracking resistance. The weld metal has a composition that contains 0.05-0.15% by mass C, 0.10-0.25% by mass Si, 0.50-1.30% by mass Mn, 2.00-3.25% by mass Cr, 0.90-1.20% by mass Mo, 0.20-0.40% by mass V, 0.010-0.040% by mass Nb, and 250-450 ppm O, with Al being 0.040% by mass or less, P being 0.010% by mass or less, the amounts of S, Sn, Sb and As each being 0.010% by mass or less, and the amounts of Bi and Pb each being 1.0 ppm or less, with the remainder being Fe and inevitable impurities. In the microstructure, crystal grains with a particle surface area of 400 µm 2 or less make up 70% or more of all crystal grains.
摘要:
The weld metal of the present invention has a given chemical composition, contains retained austenite particles in an amount of 2,500 grains/mm 2 or more, and has a volume fraction of the retained austenite particles of 4.3 vol% or more and a content ratio of Cr and Mn, [Cr]/[Mn], of 0.20 or more. The weld metal has excellent resistance to hydrogen embrittlement even when the weld metal has a high tensile strength of more than 780 MPa.
摘要翻译:本发明的焊接金属具有给定的化学组成,含有量的残余奥氏体颗粒在2500粒/ mm 2以上的,并且具有4.3体积%以上的残余奥氏体颗粒的体积分数和的含量比 的Cr和Mn,[Cr]的/的0:20或更多[Mn]为。 焊缝金属具有氢脆性优异,即使当焊接金属有超过780兆帕的高拉伸强度。
摘要:
This weld metal has a predetermined chemical composition, controls the number of oxides in accordance with size, and has an A value stipulated by the belowmentioned formula of no greater than 5.0. A value=(100×[C] - 6×[insol.Cr] - 2×[insol.Mo]-24×[insol.V] -13×[insol.Nb])×([Mo]-[insol.Mo]), where [insol.Cr], [insol.Mo], [insol.Nb], and [insol.V] are contents (in mass percent) of Cr, Mo, Nb, and V, respectively, present as a compound after stress-relief heat treatment, and [C] and [Mo] are contents (in mass percent) of C and Mo, respectively, contained in the weld metal.
摘要:
L'invention porte sur un flux de soudage comprenant (% en masse de flux) de 10 à 35% de Mg, de 10 à 25% de Ca, de 7 à 20% de F, de 10 à 35% de Al, et de 0,10 à 7% de Li, ainsi que sur un procédé de soudage à l'arc submergé d'une ou plusieurs pièces en acier contenant au moins 5% de chrome, dans lequel on utilise un tel flux, en particulier un acier contenant de 7 à 13% en masse de chrome. De préférence, la pièce soudée est un tube.
摘要:
A heat input control method for a welding system includes the step of receiving data encoding a desired heat input range having heat input values included between an upper limit and a lower limit. The method also includes the step of receiving data encoding a desired change to a level of a first weld variable of a set of weld variables. Further, the method includes determining a change to a level of a second weld variable of the set of weld variables. The determined change to the level of the second weld variable is suitable to maintain a heat input of a welding operation within the desired heat input range.
摘要:
Disclosed is a bonded flux and a solid wire for submerged arc welding, and a method for submerged arc welding of a low-temperature steel each of which gives a weld bead (weld metal) having excellent low-temperature fracture toughness with satisfactory weldability. The bonded flux includes 23-43% of MgO, 11-31% of Al 2 O 3 , 6-16% of CaF 2 ,7-20°% of SiO 2 , 1.0-8.0% as CO 2 equivalent of a metal carbonate, a total of 2-16% of CaO and/or BaO, 0.4-1.5% of metallic silicon, a total of 1.0-7.0% as titanium equivalent of metallic titanium and titanium oxide, a total of 0.01-0.20% as boron equivalent of metallic boron and/or boron oxide, and a total of 1.0-6.0% as equivalents of respective elements of at least one oxide of Na, K, and Li, and has a ratio ([Total Ti]+[Total B])/[SiO 2 ] of from 0.05 to 0.55.