Welding method suitable for 690MPa-grade high-strength steel plate

• Main Authors: TIAN MENG, LI LI, QU JINBO
• Format: Patent
• Language: Chinese; English
• Published: 03.11.2023
• Subjects: CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR; PERFORMING OPERATIONS; SOLDERING OR UNSOLDERING; TRANSPORTING; WELDING; WORKING BY LASER BEAM

The invention discloses a welding method suitable for a 690MPa-grade high-strength steel plate. The welding method comprises the following steps: processing a groove; cleaning and polishing; preheating to 50-80 DEG C; the welding current ranges from 375 A to 550 A, the welding voltage ranges from 26 V to 30 V, the welding speed ranges from 40 cm/min to 48 cm/min, the welding heat input quantity ranges from 12 kJ/cm to 25 kJ/cm, and a welding wire comprises 0.04%-0.08% of C, 0.22%-0.32% of Si, 1.3%-1.5% of Mn, 2.7%-3.3% of Ni, smaller than or equal to 0.008% of S, smaller than or equal to 0.0015% of P, 0.043%-0.062% of Cu, 0.2%-0.28% of Cr, 0.44%-0.56% of Mo, 0.015%-0.025% of Ti and the balance Fe and impurities. CTOD of weld metal and a coarse grain zone of a welding heat affected zone at-35 DEG C is larger than or equal to 0.25 mm. 本发明揭示了一种适用于690MPa级高强度钢板的焊接方法，焊接方法包括：坡口加工；清理和打磨；预热至50～80℃；埋弧焊接，焊接电流为375～550A，焊接电压为26～30V，焊接速度为40～48cm/min，焊接热输入量为12～25kJ/cm，焊丝中：C 0.04～0.08％，Si 0.22～0.32％，Mn 1.3～1.5％，Ni 2.7～3.3％，S