Method for welding specially-thick high-strength bridge steel plate
A welding method and bridge technology are applied in the welding of low-alloy high-strength steel extra-thick plates, and the welding of extra-thick and high-strength bridge steel plates, which can solve the problems of difficult control of welding deformation of extra-thick plates, low welding efficiency, and easy occurrence of cold cracks. , to avoid reheat embrittlement, improve welding efficiency, and avoid reheat cracks
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[0024] Example 1:
[0025] Base material: 100mm thick Q370qE bridge steel plate produced by hot-rolled + normalizing process, yield strength 380MPa, tensile strength 530MPa, elongation 32%, impact energy at -40°C at 1 / 4 plate thickness, 263J, plate thickness 1 / 2 The impact energy is 233J at -40℃, the thickness of the welded steel plate is 100mm+100mm, the size of the test plate is 600mm×220mm×100mm, and the groove form is shown in the attachment figure 1 Shown
[0026] Welding material: gas shielded welding wire diameter Φ1.2mm, cladding metal mechanical properties: yield strength 525MPa, tensile strength 595MPa, elongation 27%, -40℃ impact energy 76J; submerged arc welding wire diameter Φ5mm, cladding metal mechanical properties It is: the yield strength is 450MPa, the tensile strength is 560MPa, the elongation is 30%, and the impact energy is 125J at -40°C.
[0027] Welding process: Use mechanical treatment to clean the groove surface before welding to remove oil and rust; preheat...
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[0029] Example 2:
[0030] Base material: 150mm thick Q370qE bridge steel plate produced by hot-rolled + normalizing process, yield strength 375MPa, tensile strength 520MPa, elongation 30%, impact energy at -40°C at 1 / 4 thickness, 227J, thickness 1 / 2 The impact energy is 207J at -40℃, the thickness of the welded steel plate is 150mm+150mm, the size of the test plate is 600mm×220mm×100mm, and the groove form is shown in the attachment figure 2 Shown
[0031] Welding material: gas shielded welding wire diameter Φ1.2mm, cladding metal mechanical properties: yield strength 525MPa, tensile strength 595MPa, elongation 27%, -40℃ impact energy 76J; submerged arc welding wire diameter Φ5mm, cladding metal mechanical properties It is: the yield strength is 450MPa, the tensile strength is 560MPa, the elongation is 30%, and the impact energy is 125J at -40°C.
[0032] Welding process: Before welding, mechanical treatment is used to clean the groove surface to remove oil stains and rust; prehea...
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