一种抗震耐蚀耐火建筑结构钢用690MPa级气体保护焊丝，属于焊接材料技术领域。该焊丝化学元素质量百分比含量为：C：0 .02-0 .14％，Si：0 .41 -1 .00％ ，C r：0-0 .7 0％ ，Ni：1 .00-3 .50％，Cu：0 .20-0 .90％，Mn：1 .20-2 .20％，Mo：0 .60-1 .00％，Ti：0-0 .12％，V：0-0 .10％，Mg：0-0 .10％；余量为Fe及不可避免的杂质。优点在于，焊丝进行气体保护焊接后，所形成的焊缝金属的屈服强度为469-592Mpa，抗拉强度而为538-661Mpa，延伸率A为18-22％。焊缝金属高温屈服强度为463-535MPa；并且具有高的低温冲击韧性。 

A 690 MPa gas shielded welding wire for anti-seismic, corrosion-resistant and fire-resistant building structural steel belongs to the field of welding material technology. The mass percentage content of the chemical elements of the welding wire was as follows : C : 0.02 – 0.14 %, Si : 0.41 – 1.00 %, Cr : 0 – 0.70 %, Ni : 1.00 – 3.50 %, Cu : 0.20 – 0.90 %, Mn : 1.20 – 2.20 %, Mo : 0.60 – 1.00 %, Ti : 0.12 %, V : 0.10 %, Mg : 0.10 %. The remainder is Fe and inevitable impurities. The advantage is that the yield strength of the formed weld metal is 469 – 592 MPa, the tensile strength is 538 – 661 MPa, and the elongation A is 18 – 22 % after gas shielded welding. The high-temperature yield strength of weld metal is 463 – 535 MPa. And has high low temperature impact toughness.