Analysis on the Forming of Positioning Interface in Pre-brazing Resistance Welding for DD5 Alloy and the Joint Performance
SHENG Hongfei1,2, DENG Lipeng1,2,*, YI Runhua1,2, LI Haitao2, CHENG Donghai2, HUANG Bin3
1 School of Aeronautical Manufacturing Engineering, Nanchang Hangkong University, Nanchang 330063, China 2 National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang 330063, China 3 Room 417 of AECC South Industry Co., Ltd., Zhuzhou 412000, Hunan, China
Abstract: This work was focused on the forming and performance analysis of resistance welding positioning interface prior to vacuum brazing with respect to the DD5 nickel-based single crystal high-temperature alloy components of a certain type of aircraft engine. The GH3030 foil with a thickness of 0.1 mm was used as the microgap support point for welding and on a resistance welding machine. The influence of equivalent double pulse resistance welding process parameters (welding current I1=I2, welding time t1=t2, welding pressure P) on the formation and mechanical properties of the microgap interface was studied. The interfacial properties showed an inverted V-shaped trend with the increase of welding time and welding pressure. Under the conditions of t1=t2=0.2 s and P=11.54 kN, the rise of welding current resulted in a gradual increase of the area of interface microgap positioning point connection, the homogenization of the growth directions of the γ-Ni phases dendritic structure, and a gradual increase of tensile load. As a large amount of TaC precipitates, pore defects appeared in the enriched area of TaC. When I1=I2=6.7 kA, the tensile load at the microgap interface reached its maximum of 8.63 kN, with a microgap size of 0.05 mm. When I1=I2>6.7 kA, the supporting GH3030 splashed severely and the mechanical properties decreased significantly. The single-pulse tensile fracture had a small dimple with incomplete welding defects observed, while the equivalent double-pulse tensile fracture had a larger dimple and located in the heat-affected zone.
盛红飞, 邓黎鹏, 易润华, 李海涛, 程东海, 黄斌. DD5合金钎焊前电阻焊定位界面成形及性能分析研究[J]. 材料导报, 2025, 39(9): 24030006-5.
SHENG Hongfei, DENG Lipeng, YI Runhua, LI Haitao, CHENG Donghai, HUANG Bin. Analysis on the Forming of Positioning Interface in Pre-brazing Resistance Welding for DD5 Alloy and the Joint Performance. Materials Reports, 2025, 39(9): 24030006-5.
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2025, Vol. 39 
