摩擦叠焊单元成型质量影响因素研究

Study on the influence factor for friction hydro pillar processing

摩擦叠焊单元成型的工艺参数对接头表面成形及其性能有着决定性的影响。进行了大量焊接工艺试验,考查了各种参数组合下的焊接接头质量,对比各焊接参数下接头的微观组织、宏观形貌和焊接压力,分析缺陷出现的原因并提出改善方法。结果表明:主轴转速在3500r/min以上,焊接速度40mm/min以上的范围内,得到的焊接接头组织致密均匀,缺陷少;圆头圆底的形状组合能带来比其他组合更好的接头质量。焊缝区域材料在接头底部"过渡区域"的流动性较差,而且缺陷大多出现在此,采用圆头圆底形状组合能够明显改善这一现象。焊接压力变化也对焊接质量影响很大,在合适的参数组合作用下,得到的焊接压力变化过程与实际焊接过程中金属材料的加热、塑化、凝固的变化过程对应。

The welding parameters of friction hydro pillar processing play an important part in the welded joints＇ figuration and properties.Large numbers of welding processing experiments were conducted,and the welding quality,microstructure,macro features as well as the welding pressure of various parameters were tested.Besides,the cause of welding defects was analyzed and improvements were put forward.The results indicated that the microstructure of welded joints was regular and compact,and the welding defect was seldom when the spindle speed was above 3 500 r/min and welding speed was above 40 mm/min.The welding quality from the round head-round bottomed combination was better than the other combinations.Welding material＇s flowability at the transitional area of joints bottom was poor and the welding defects always occur nearby,and this problem can be solved by using the round bottomed combination.Moreover,welding pressure also has a great influence on the welding quality.The acquired pressure history was in line with process of actual welding while the welding parameters were set properly.