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发明公开
CN109128550A 一种抗拉强度Rm≥810MPa桥梁钢气保护焊接方法 有权

一种抗拉强度Rm≥810MPa桥梁钢气保护焊接方法
摘要：
一种抗拉强度Rm≥810MPa桥梁钢气保护焊接方法：基材：ReL≥690MPa，Rm≥810MPa，A≥14%，‑40℃KV2冲击功≥120J；坡口采用双面V型对称：打底焊丝采用抗拉强度550MPa级的实芯气保护焊丝，填充及盖面焊丝采用Rm≥810MPa实芯气保护焊丝；焊接工艺：先用CO2气保护焊打底焊，正反面各焊一道次并无需清根；再填充及盖面气体焊接。本发明焊接的对接接头三区冲击功焊缝20℃KV2=147~167J，熔合线冲击功20℃KV2=214~224J，热影响区(1mm)20℃KV2=215~227J，焊缝‑20℃KV2=126~134J，熔合线冲击功‑20℃KV2=132~144J，热影响区(1mm)‑20℃KV2=142~159J，焊缝‑40℃KV2=96~108J，熔合线冲击功‑40℃KV2=125~139J，热影响区(1mm)‑40℃KV2=134~158J，焊缝耐腐蚀指数I=8.89~9.46。
摘要（英）：

The invention relates to a gas shielded welding method of bridge steel with tensile strength Rm greater than or equal to 810 MPa. Base materials: ReL is greater than or equal to 690 MPa, Rm is greaterthan or equal to 810 MPa, A is greater than or equal to 14%, and the impact work KV2 at -40 DEG C is greater than or equal to 120 J; double-faced V-shaped symmetrical grooves are adopted; and a backing welding wire adopts a solid gas shielded welding wire of which the tensile strength is 550 MPa, and a filling and covering welding wire adopts a solid gas shielded welding wire of which Rm is greater than or equal to 810 MPa. A welding process comprises the steps of performing backing welding first by adopting CO2 gas shielded welding, and welding front and back surfaces respectively for one pass without back chipping; then performing filling and covering gas welding. According to a butt joint welded by adopting the gas shielded welding method, the impact work KV2 of a three-area impact work welding beam at 20 DEG C is 147 to 167 J, the impact work KV2 of a fusion line at 20 DEG C is 214 to 224 J, the impact work KV2 of a heat affected area (1 mm) at 20 DEG C is 215 to 227 J, the impactwork KV2 of the welding beam at -20 DEG C is 126 to 134 J, the impact work KV2 of the fusion line at -20 DEG C is 132 to 144 J, the impact work KV2 of the heat affected area (1 mm) at -20 DEG C is 142 to 159 J, the impact work KV2 of the welding beam at -40 DEG C is 96 to 108 J, the impact work KV2 of the fusion line at -40 DEG C is 125 to 139 J, the impact work KV2 of the heat affected area (1 mm) at -40 DEG C is 134 to 158 J, and the corrosion resistant index I of the welding seam is 8.89 to 9.46.

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