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对TC4钛合金进行直流正接TIG和A-TIG焊接试验,选用卤化物CaF2、NaCl和氧化物Cr2O3、SiO2、TiO2作为活性剂,研究单一组元活性剂对焊缝表面成形、焊缝熔深及接头组织的影响。结果表明:涂敷活性剂对焊接过程稳定性没有产生明显影响,焊缝表面平整光滑,成形良好。选择合适的活性剂,能够在一定程度上增加焊缝熔深。活性剂成分不同,熔深增加程度也不同,其中SiO2增加熔深作用较为明显,熔深增加约1.9倍。通过金相组织观察,发现TIG和A-TIG焊接头显微组织相似,其中焊缝组织为α+α′,热影响区组织为α+β+α′。
The DC positive TIG and A-TIG welding tests of TC4 titanium alloy were carried out. Halides CaF2, NaCl and oxides Cr2O3, SiO2 and TiO2 were selected as active agents to study the effect of single component activator on the weld surface forming, Effect of linker tissue. The results show that the active agent coating has no obvious effect on the stability of the welding process. The weld surface is smooth and well formed. Select the appropriate active agent, to a certain extent, increase the weld penetration. The composition of active agent is different, the degree of penetration increase is also different, SiO2 is more obvious, the penetration depth is increased about 1.9 times. The microstructures of TIG and A-TIG welded joints were observed by metallographic observation. The weld microstructure was α + α ’and the heat-affected zone was α + β + α’.