X70钢管道全位置激光-MAG电弧复合根焊焊缝成形试验研究

发布时间：2018-02-02 09:51

本文关键词： 激光技术 X钢激光-MAG复合焊全位置焊内凹　出处：《中国激光》2015年04期 　论文类型：期刊论文

【摘要】：针对X70钢管道全位置激光-熔化极活性气体保护(MAG)电弧复合根焊焊接过程中,管道焊接3~6点位焊缝背面易出现内凹,开展了管道全位置激光-MAG电弧复合根焊焊缝成形试验研究。试验结果表明,激光-电弧复合焊接能量输入、焊枪角度对焊缝背面内凹影响较大;焊缝背面内凹可能是由于熔池液态金属重力作用导致焊缝熔融金属下淌所致。通过变参数能量输入方法,从3点位到6点位逐渐降低激光-电弧复合焊接功率;并向上倾斜焊枪角度使激光和焊缝切线方向成80°时,可利用保护气吹力和电弧力"托住"熔池,有效抑制内凹缺陷,改善焊缝成形。此外,发现焊缝背面有无内凹对静载拉伸性能基本无影响,有内凹管道的抗拉强度可达到596 MPa以上,但焊缝背面内凹大幅降低了管道疲劳性能。
[Abstract]:In the process of all-position laser-activated gas shielded arc arc composite root welding of X70 steel pipeline, the internal concave is easy to appear on the back of the weld at 3 ~ 6 points. In this paper, the weld forming test of all-position laser-MAG arc composite root welding is carried out. The experimental results show that the input of laser arc composite welding energy and the angle of welding torch have great influence on the inner concave of the back of the weld. The inner concave of the back of the weld is probably caused by the gravity action of molten metal in the weld pool, and the power of laser-arc composite welding is gradually reduced from 3 to 6 by the method of variable parameter energy input. When the angle of upward tilt welding torch is 80 掳for laser and welding seam tangent, the protective gas blowing force and arc force can be used to "support" the weld pool, which can effectively restrain the inner concave defect and improve the weld formation. It is found that there is no effect on the static tensile properties of the pipe with or without an inner concave on the back of the weld, and the tensile strength of the pipe with an inner concave can reach more than 596 MPa, but the fatigue property of the pipe is greatly reduced by the inner concave on the back of the weld.
【作者单位】：哈尔滨工业大学先进焊接与连接国家重点实验室;中国石油天然气管道科学研究院;
【基金】：国家自然科学基金(51105105) 中央高校基本科研基金(HIT.NSRIF.201137)
【分类号】：TG456
【正文快照】： 1引言随着石油工业的高速发展,油气管道作为远距离油气输送的主要方式,有了长足的发展。X70钢是目前国内外最具代表性的高韧性、高强度、大口径管线钢,用来实现高压、长距离天然气输送。在我国西气东输工程中有近4000 km管线选用了X70管线钢,它的壁厚范围在18.4~33 mm,管径为1

【参考文献】