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Solid welding wire for FCB method and high-heat input submerged-arc welding and preparation method and application of solid welding wire

A solid welding wire and submerged arc welding technology, which is applied in welding equipment, welding equipment, arc welding equipment, etc., can solve the problem of not having the supply capacity of welding materials for steel for large heat input welding, and achieve the suppression of grain coarsening Effect

Active Publication Date: 2021-02-26
李素坤
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Regrettably, at present, many welding consumable manufacturers in my country still do not have the supply capacity of supporting welding consumables for high-energy-input welding steel. Enterprises import at high prices (about 25,000 to 30,000 yuan / ton). In order to get rid of this passive situation of being controlled by others for a long time, domestic iron and steel enterprises, welding consumable manufacturers, shipbuilding enterprises, colleges and universities and research institutes should work together to promote large-scale production. Localization process of supporting welding materials for energy welding steel

Method used

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  • Solid welding wire for FCB method and high-heat input submerged-arc welding and preparation method and application of solid welding wire
  • Solid welding wire for FCB method and high-heat input submerged-arc welding and preparation method and application of solid welding wire
  • Solid welding wire for FCB method and high-heat input submerged-arc welding and preparation method and application of solid welding wire

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]Converter smelting-LF furnace refining-continuous casting process is adopted. When the molten steel reaches the LF furnace for refining, the oxide metallurgy process is adopted to control the oxygen content to 45ppm through weak deoxidation of silicon and manganese, and then add Ti, Mg, Al, Ca and B in sequence. Elements, each element is added at an interval of 8 minutes, and then LF furnace slagging, desulfurization and alloying are carried out. After the LF furnace refining is completed, the molten steel enters the continuous casting process to cast a 150×150mm square billet. The chemical composition of the slab by mass percentage is: C 0.08%, Si 0.21%, Mn1.57%, P 0.010%, S 0.003%, Ni 0.22%, Cu0.20%, Ti 0.015%, Mg 0.003%, Ca0. 003%, Al T 0.02%, B 0.002%, N 0.004%, O 0.003%, and the balance is Fe and unavoidable impurities.

[0033] After the continuous casting billets are stacked for about 24 hours, they are heated to 1100°C by a walking heating furnace. The rolling ...

Embodiment 2

[0044] The 4.8mm diameter welding wire obtained in Example 1 and Comparative Example 1 was respectively placed on the L pole and T1 pole of the FCB method submerged arc automatic welding machine, and the 6.4mm diameter welding wire was placed on the T2 pole, and the domestic 34mm thick EH36 shipbuilding steel plate was used to match Japan. Nippon Steel (strain) imported flux NSH-1RM / NSM-50M, under the parameter conditions shown in table 3, carry out the FCB method large input energy submerged arc welding comparative test of embodiment 1 and comparative example 1 welding wire, as a reference, also in the meantime Under the same parameter conditions shown in table 3, the comparative test of the welding wire of embodiment 1 and the imported Y-DL welding wire of Nippon Steel (strain) was carried out. The macroscopic metallographic photograph of comparative example 1 welded joint is as image 3 shown. From the data in Table 4, it can be seen that the cold bending performance of th...

Embodiment 3

[0050] The diameter 4.8mm welding wire that embodiment 1 and comparative example 1 obtains is used as the first two wires (L pole and T1 pole) of FCB submerged arc welding machine, and the diameter 6.4mm welding wire is used as the rear wire (T2 pole) of FCB submerged arc welding machine, Using the 30mm thick Q420C steel plate used in the "deep and middle channel" immersed tube currently under construction to match the domestic TGF-55E / TGF-B flux, the comparative test of the FCB method large-line energy submerged arc welding was carried out under the parameters shown in Table 5. The mechanical properties of the joints are shown in Table 6, and the macroscopic metallographic photos of the welded joints are shown in Table 6. Figure 4 shown. From the data in Table 6, it is not difficult to find that when the welding wire of Example 1 is matched with the domestic flux for welding low-alloy high-strength structural steel plates with a yield strength of 420MPa, the strength and tou...

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Abstract

The invention discloses a solid welding wire for an FCB method and high-heat input submerged-arc welding and a preparation method and application of the solid welding wire, and belongs to the technical field of welding materials. The welding wire comprises the following chemical components in percentage by weight: 0.06-0.09% of C, 0.12-0.28% of Si, 1.52-2.0% of Mn, 0.0001-0.3% of A and the balanceof Fe and inevitable impurities, wherein the element A is one or more of Mg, Ca, Zr, RE and B. The chemical components of the solid welding wire further contain Ti, Ni and Cu (or contain Ti and V). After the welding wire is used for welding at the online energy of 60-300kJ / cm, the strength and the low-temperature impact toughness, which are matched with those of base metal, of a welding joint canbe guaranteed. The welding wire is suitable for the FCB method of a structural steel plate with the thickness smaller than 40 mm and high heat input welding of other submerged-arc welding machines.

Description

technical field [0001] The invention relates to the technical field of welding materials, in particular to a solid welding wire used for FCB large input energy submerged arc welding and its preparation method and application. Background technique [0002] In recent years, with the rapid rise of manufacturing industries such as shipbuilding, ocean engineering, high-rise buildings, bridges, and construction machinery, and in response to the development trend of increasingly large-scale and long-span components, these industries that use a large number of medium-thick steel plates are aimed at improving welding construction efficiency and Reduce costs, and gradually start to adopt gas-electric vertical welding, FCB method submerged arc automatic welding and electroslag welding and other large-energy welding methods. Among them, the FCB method (Flux Cooper Backing) is also called the flux copper backing method. It evenly lays a backing flux with a thickness of 4 to 6 mm on a pla...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/18B23K35/30B23K35/40
CPCB23K35/3073B23K35/40B23K9/18Y02P70/10
Inventor 朱伏先李素坤朱雨庄焱磊
Owner 李素坤
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