摆动激光焊接GH4169镍基高温合金焊缝成形性能研究

Forming Performance of GH4169 Ni-based Superalloy Weld Produced by Laser Oscillating Welding

进行了GH4169镍基高温合金的摆动激光焊接工艺试验,研究了不同摆动参数对焊缝气孔率、宏观成形、微观组织和显微硬度的影响。结果表明:采用小振幅、低频率的摆动工艺有利于气孔的抑制,而大振幅对气孔抑制的作用更为显著。摆动引入后,熔深降低,尤其是随着振幅的增加。2.5 mm振幅下,匙孔焊接模式消失,焊缝生长方向发生变化。相较于未摆动,不同摆动参数下焊缝晶粒尺寸未发生明显变化,但摆动焊缝的二次枝晶有一定程度细化,这导致焊缝平均硬度出现微弱升高。

The laser oscillating welding process tests of GH4169 Ni-based superalloy were carried out,and the effects of different oscillating parameters on the porosity,macro-forming,microstructure and microhardness of the welds were studied.The results show that the oscillating process with low frequency and small amplitude is beneficial to the inhibition of porosity,while the inhibition of porosity is more significant under large oscillating amplitude.After the introduction of oscillation,the weld penetration decreases,especially with the increase of amplitude.under the amplitude of 2.5 mm,the keyhole welding mode disappears,and the growth direction of the weld changes.Compared with the non-oscillation,the grain size of the welds doesn't change obviously under different oscillating parameters,however,the secondary dendrites of the oscillating welds are refined to a certain extent,which results in slight rise of the average hardness of the oscillating welds.