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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Embodiment 1
[0025] Base material: 100mm thick Q370qE bridge steel plate produced by hot rolling + normalizing process, yield strength 380MPa, tensile strength 530MPa, elongation 32%, impact energy 263J at -40°C at 1 / 4 thickness, 1 / 2 thickness The impact energy at -40°C is 233J, the thickness combination of welded steel plates is 100mm+100mm, and the size of the test plate is 600mm×220mm×100mm. figure 1 shown;
[0026] Welding materials: gas shielded welding wire diameter Φ1.2mm, mechanical properties of cladding metal: yield strength 525MPa, tensile strength 595MPa, elongation 27%, impact energy at -40°C 76J; submerged arc welding wire diameter Φ5mm, mechanical properties of cladding metal It is: yield strength 450MPa, tensile strength 560MPa, elongation 30%, impact energy at -40°C 125J.
[0027] Welding process: Before welding, use mechanical treatment to clean the groove surface to remove oil and rust; preheat 150 ° C before welding, and control the interlayer temperature at 150 ~ 200 ...
Embodiment 2
[0030] Base material: 150mm thick Q370qE bridge steel plate produced by hot rolling + normalizing process, yield strength 375MPa, tensile strength 520MPa, elongation 30%, impact energy 227J at -40°C at 1 / 4 of the plate thickness, 1 / 2 plate thickness The impact energy at -40°C is 207J, the thickness combination of welded steel plates is 150mm+150mm, and the size of the test plate is 600mm×220mm×100mm. figure 2 shown;
[0031] Welding materials: gas shielded welding wire diameter Φ1.2mm, mechanical properties of cladding metal: yield strength 525MPa, tensile strength 595MPa, elongation 27%, impact energy at -40°C 76J; submerged arc welding wire diameter Φ5mm, mechanical properties of cladding metal It is: yield strength 450MPa, tensile strength 560MPa, elongation 30%, impact energy at -40°C 125J.
[0032] Welding process: Before welding, use mechanical treatment to clean the groove surface to remove oil and rust; preheat 150°C before welding, and control the interlayer tempera...
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