Submerged-arc welding point, producing method of the same welding point, and used solder wire and flux
A large input energy and welding joint technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of toughness deterioration, weld metal that cannot obtain large input energy, etc.
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Embodiment 1
[0106] For 490MPa grade steel plates (thickness: 25mm, 40mm) with base metal composition shown in Table 1 Figure 1A , Figure 1B Groove processing in the shape shown, and welded joints were produced by one pass of submerged arc welding. When the plate thickness is 25mm, the groove shape is し-type groove, the groove angle is 40°, and the blunt edge is 2mm. Also, when the thickness of the steel plate is 40 mm, the groove shape is a Y-shaped groove, the groove angle is 35°, and the blunt edge is 3 mm.
[0107] The submerged arc welding was performed using a two-electrode submerged arc welding machine under the welding conditions shown in Table 2 using welding wires with the compositions shown in Table 3. In addition, the flux used was a commercially available iron powder sintered type flux containing 0.4% by mass of boron oxide having the composition shown in Table 4. Next, as the iron powder contained in the flux, iron powder made of sponge iron was used. The welding input e...
Embodiment 2
[0114] For 490MPa-grade steel plates (thickness t: 40mm) and TMCP steel plates for building structures (thickness t: 60mm) with base metal compositions shown in Table 7, the image 3 Groove processing in the shape shown, and welded joints were produced by one pass of submerged arc welding. The groove shape is Y-shaped, the groove angle is 35°, the blunt edge d (mm) is 2mm when the plate thickness t: 40mm, and 3mm when the plate thickness t: 60mm.
[0115] The submerged arc welding was performed using a two-electrode submerged arc welding machine, under the welding conditions shown in Table 8, and using wires having the wire composition shown in Table 9. In addition, the flux containing boron oxide and iron powder is used, and the flux is compounded as shown in Table 10, mixed and stirred with sodium silicate, granulated, and then fired at 500°C for 15 minutes. 3mm or less. In addition, as the iron powder added to the flux, iron powder having a nitrogen content shown in Table...
Embodiment 3
[0121] For 490MPa-grade steel plates (thickness t: 40mm) and TMCP steel plates for building structures (thickness t: 60mm) with base metal compositions shown in Table 7, the image 3 Groove processing in the shape shown, and welded joints were produced by one pass of submerged arc welding. The groove shape is Y-shaped, the groove angle is 35°, the blunt edge d (mm) is 2mm when the plate thickness t: 40mm, and 3mm when the plate thickness t: 60mm.
[0122] The submerged arc welding was performed using a two-electrode submerged arc welding machine under the welding conditions shown in Table 14, using wires with the wire composition shown in Table 15 and fluxes with the composition shown in Table 16.
[0123] In addition, the flux was prepared as raw materials with the composition shown in Table 16, mixed and stirred with sodium silicate aqueous solution (addition amount: about 200 cc per 1 kg of flux), granulated, and then fired at 500°C for 15 minutes. The particle size was Be...
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