( 1. 大連理工大學(xué) 三束材料表面改性國家重點(diǎn)實(shí)驗(yàn)室，
大連 116024;
2. 沈陽飛機(jī)制造有限公司 制造工程部, 沈陽 110034)
摘 要: 采用現(xiàn)代測試手段分析TA15鈦合金活性劑補(bǔ)焊接頭微觀組織特征，探討鈦合金焊縫采用活性劑多次補(bǔ)焊的可行性。 結(jié)果表明： 涂有活性劑補(bǔ)焊接頭各區(qū)域結(jié)合良好， 熱影響區(qū)域小且與焊縫區(qū)過渡平緩， 沒有出現(xiàn)明顯分界； 涂活性劑焊縫區(qū)晶內(nèi)組織并未因補(bǔ)焊次數(shù)的增加而粗大；焊縫接頭主要元素Ti、 Al、 Mo、 V和Zr均分布均勻，沒有因采用活性劑而出現(xiàn)燒損和偏聚的現(xiàn)象； 室溫下補(bǔ)焊焊縫組織由α-Ti組成； 涂活性劑焊縫各補(bǔ)焊區(qū)硬度值接近，略低于正常焊縫區(qū)硬度。 采用活性劑對鈦合金可以進(jìn)行多次補(bǔ)焊并能夠獲得高質(zhì)量焊縫。
關(guān)鍵字: TA15鈦合金； 鎢極氬弧焊； 活性劑； 補(bǔ)焊； 組織特征
（ 1. State Key Laboratory of Material Surface Modification by Laser,
Ion and Beams, Dalian University of Technology, Dalian 116024, China;
2. Department of Manufacturing Engineering,
Shenyang Aircraft Corporation, Shenyang 110034, China）
Abstract: The microstructure characteristics of TA15 titanium alloy joint multiple repaired with activated flux were analyzed by modern testing means. The results show that the interfaces of each repair zone welded with flux are joined well, the HAZ is narrow and the area from HAZ to bead transits smoothly. The microstructure of welding intracrystalline repair welded with flux does not grow up with increasing time. The major elements Ti, Al, Mo, V and Zr within the weld are distributed symmetrically, and the melting loss and segregation do not appear. In the room temperature repair joint structure is composed of α-Ti. Meanwhile the micro-rigidities of each repair zone are parallel, and are a bit lower than initial weld zone's. The repair welding of TA15 titanium alloy with flux is a mending method which can obtain high quality repairing bead.
Key words: TA15 Ti alloy; gas tungsten arc welding; flux; repair welding; structure character
