Fe—Al基金属间化合物的焊接性

THE WELDABILITY OF IRON-ALUMINIUM BASED INTERMETALLICS

分别用电子束焊（ＥＢＷ）及钨极氩弧焊（ＧＴＡ）两种焊接方法对 Ｆｅ－Ａｌ基合金试样进行了焊接性研究结果表明，用ＥＢＷ方法可以成功地得到无裂纹与缺陷的 Ｆｅ—Ａｌ基合金焊缝；对 ＧＴＡ方法，需采用预热及焊后缓冷工艺方可有效地阻止延迟冷裂纹的产生，选择中低碳 ＣｒＭｏ钢焊丝作填充材料， 使 Ｆｅ３Ａｌ基合金具有较好的焊接性．同种材料，同种焊丝，在保证焊透的情况下减小焊接电流和热输入。

The ingots of two Fe3Al-based alloys and one Fe--16%Al based alloy have been conventionally prepared by vacuum induction melting, and then hot forged, and hot rolled into thin sheets stock with thickness of 1.5--2 mm and width of 180 mm. The weldability tests have been performed on the specimens of 80 mm × 160 mm with weld length of 150 mm by using electron beam (EBW) and gas tungsten arc (GTA) welds. The welds with no crack and defect can be successfully produced by EBW welding for all alloys studied in the present work. The results from GTA welding processing tests indicated that pre--heating and post--annealing treatment were important procedures for preventing from delayed cold crack, and proper selection of filler materials could effectively improve the weldability of the alloys studied. For the same alloys and same welding filler, it is effective way of decreasing cracking tendency of alloy to choose low welding current, i. e., low heat input.