4 results about "Submerged arc welding" patented technology

A vacuum adsorption welding device for plate splicing in submerged-arc welding comprises a first welding platform, a second welding platform and a gasket. The first welding platform and the second welding platform are adjacent, and the gasket is arranged between the first welding platform and the second welding platform. Each of the first welding platform and the second welding platform is provided with a plurality of vacuum suction ports. The welding device further comprises vacuum components and sealing gaskets, the vacuum components are connected to the vacuum suction ports, and the sealing gaskets are arranged along the peripheries of the first welding platform and the second welding platform. The vacuum adsorption welding device has advantages that by the vacuum components, quickness in plate fixation and convenience and quickness in operation are realized; small weld seam deformation and freeness of shaping after welding are realized.

The invention relates to a welding wire for steel-copper dissimilar metal submerged-arc welding and a welding method of the welding wirearc, belonging to the field of submerged-arc welding. The welding wire comprises the following chemical components in percentage by weight: 0.05-0.15% of arcbon, 0.80-2.10% of manganese, 0.07-0.95% of silicon, 0-0.03% of sulphur, 0-0.03% of phosphorus, 0.20-0.35% of copper, 0-0.20% of chromium, 0-0.30% of nickel and the balance of iron; the welding method comprises the following steps that: before being welded, a copper plate and a steel plate are not preheated; the steel plate and the copper plate are fixed by using gas shield welding spot welding; steel-copper dissimilar metal submerged-arc welding wires are used for matching with SJ101 welding flux so as to carry out submerged-arc welding; when being welded, the welding wire deviates 4mm-8mm from the side of the copper plate; the welding current is 396-630A; the welding voltage is 35-40V; and the welding speed is 23-30m/h. The welding joint obtained by the welding method provided by the invention has the characteristics of good mechanical performance, high efficiency, beautiful appearance and little crack, etc.

The invention relates to steel tube expanding head diameter expansion outer fan-shaped blocks, in particular to a submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea and a surface protection method thereof. A U-shaped welded joint containing groove is formed in the outer side of the fan-shaped middle part of the submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea. The U-shaped welded joint containing groove comprises a first arc-shaped part on the left side, a second arc-shaped part on the right side and a third arc-shaped part at the bottom. A ternary boride metal ceramic coating is formed on the outer surface of the outer fan-shaped block. The surface protection method of the outer fan-shaped block includes the steps that the U-shaped welded joint containing groove is formed in the outer fan-shaped block, then plasma spraying machining is conducted on the outer surface of the outer fan-shaped block through plasma spraying equipment and an automatic synchronization powder feeding device, and the ternary boride metal ceramic coating is formed. According to the submerged-arc welding straight welded pipe diameter expansion outer fan-shaped block for deep sea, the service life of an expanding head can be effectively prolonged, the replacement cost of the expanding head is lowered, and the quality of the inner wall of a welded pipe is improved.

The invention discloses a submerged arc welding method with excellent toughness of a welded joint of a BB503 steel plate for a 100 mm thick blast furnace shell. The tensile strength of the BB503 steelplate is 500 - 600 MPa, the yield strength is 330 - 400 MPa, and the elongation rate is no less than 24%, minus 20 DEG C low temperature impact energy is no less than 100 J. The welding material matched with BB503 steel plate with excellent mechanical properties is made of symmetrical K-shaped groove; submerged arc flux is treated (200 - 350) DEG C x 2hours; the steel plate is free from preheating before welding, the thickness is 100 mm + 100 mm steel plate combination is welded by multi-layer submerged arc welding, and the temperature between the welding lines is no more than 200 DEG C. Thewelded joint of a BB503 steel plate for a 100 mm thick blast furnace shell has excellent comprehensive mechanical properties, high production efficiency and strong practicability, and is suitable forapplication and promotion of steel welding for blast furnace shells.