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我厂生产的TCF50—160叶轮是在分体铸造后机械加工,再焊接而成的铸焊结构件。原焊接结构形式如图1左侧所示。在该结构形式下,如采用ZS28和CN-7M铸造合金制造时,由于焊接过程中叶片与盖板间焊缝的未焊透而在角焊缝上产生热裂纹(图2);如采用CD-4MCu铸造合金(固溶处理后,金相组织为F70％+A30％)制造时,常因焊接应力的作用,而在叶片与叶片间的盖板上产生冷裂纹(图1)。严重地影响了产品质量和生产进度。
The TCF50-160 impeller produced by our factory is a cast welded structural member that is machined after split casting and then welded. The original welding structure shown in Figure 1 on the left. In this structural form, such as the use of ZS28 and CN-7M cast alloy manufacturing, due to the welding process between the blade and the cover is not welded through the fillet weld hot cracks (Figure 2); such as the use of CD -4MCu cast alloy (after solution treatment, the microstructure of the F70% + A30%) manufacturing, often due to the role of welding stress, and in the blade between the blade cold cracks (Figure 1). Seriously affected the product quality and production progress.