拱形箱型钢结构埋弧焊工艺研究

Research on submerged arc welding process of arched box structure

为实现大型拱形箱型钢结构的装配焊接,开发了一种工装。采用该工装进行埋弧焊接,并研究焊接工艺及焊接变形情况。结果显示:当焊枪倾斜角θ为7°～10°时,可减小焊缝根部出现未焊透的几率。另外,对箱型结构一侧的两条焊缝沿同一方向同时焊接,焊后翻转,再对另一侧的两条焊缝沿相同方向同时焊接,测量发现,上、下两侧的焊缝在横向同时发生了收缩,收缩量2～4 mm,在竖直方向几乎没有变化,两条对角线尺寸相差不超过2 mm。在上述工装及工艺下施焊,焊接变形可得到控制,满足工程使用要求。

In order to realize the assembly and welding of large arched box steel structures,a tooling was developed,which was used for submerged arc welding,and the welding process and welding deformation were studied.The results show that when the welding gun inclination angle θ is in the range of 7°~10°,the incomplete penetration at the root of the weld can be reduced.In addition,the two welds on one side of the box structure are welded simultaneously in the same direction,inverted after welding,and then welded simultaneously in the same direction to the two welds on the other side,and the welds on the upper and lower sides are measured by measurement.The shrinkage occurs simultaneously in the lateral direction,the shrinkage amount is 2~4 mm,and there is almost no change in the vertical direction,and the difference between the two diagonal dimensions is not more than 2 mm.In summary,under the above-mentioned tooling and process welding,the welding deformation is controlled to meet the engineering requirements.