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车架后段与固定支腿连接处是起重机吊重作业时主要受力部位,且此连接处由于截面突变而产生应力集中(应力集中是连接处发生破坏主要原因),在薄弱地方加强这一传统方法不能从根本上避免应力集中;本文介绍一种在空间上避开应力集中的新型连接方法:首先,在车架后段和固定支腿之间通过一整板实现其整体连接,避免把焊缝布置在高应力处;其次,通过结构圆弧过渡和应力集中点处挖孔,避开应力集中点,分散应力集中影响;再次,根据应力梯度分布,对连接处进行梯度加强,使各部分材料得到充分利用;最后,运用薄板厚板缓过渡对接技术和间接开槽释放焊接残余应力方法提高焊接可靠性。
The connection between the rear section of the frame and the fixed leg is the main force-bearing part of the crane when it is hoisted. The stress concentration is caused by the abrupt change of section due to the sudden change of cross-section (stress concentration is the main reason for the damage at the junction), strengthening this in weak places The traditional method can not fundamentally avoid stress concentration. In this paper, a new connection method to avoid stress concentration in space is introduced. Firstly, the whole connection between the rear section of the frame and the fixed leg is realized by a single plate, Second, through the structural arc transition and stress concentration point digging hole, to avoid the stress concentration point, scattered stress concentration; Third, according to the stress gradient distribution, the connection to the gradient to strengthen, so that each Some materials are fully utilized; finally, the welding reliability is improved by using the thin slab slow transitional docking technology and the indirect groove releasing welding residual stress method.