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采用铜侧偏束工艺实现了TA15钛合金与QCr0.8铬青铜的电子束自熔钎焊,采用光学显微镜、扫描电子显微镜和X射线衍射分析仪对焊缝组织进行了分析,通过接头抗拉强度对接头力学性能进行了评价。结果表明,电子束偏向铜合金1mm时,钛合金母材只有上部少量熔化,实现与铜合金的连接,而接头中部和下部的连接则通过液态金属对钛合金母材的钎接而实现连接。钎缝界面由较薄的Ti-Cu化合物层组成,主要包括TiCu、Ti2Cu3、TiCu2和TiCu4。而在铜侧焊缝内,细小的Ti-Cu化合物弥散分布于铜基固溶体上,使焊缝得到强化。接头强度达到300MPa,拉伸时断裂发生在铜合金上,呈韧窝状塑性断裂模式。
The TA15 titanium alloy and QCr0.8 chrome bronze were brazed with electron beam by using copper side-beam technique. The microstructure of the weld was analyzed by optical microscope, scanning electron microscope and X-ray diffraction analyzer. The strength of the connector mechanical properties were evaluated. The results show that when the electron beam is inclined to the copper alloy 1mm, only the upper part of the titanium alloy is melted by a small amount to achieve the connection with the copper alloy, while the connection between the middle and the lower part of the joint is realized by soldering the titanium alloy base material by the liquid metal. Brazing seam interface by the thin Ti-Cu compound layer, including TiCu, Ti2Cu3, TiCu2 and TiCu4. In the copper side of the weld, fine Ti-Cu compounds dispersed in the copper-based solid solution, so that the weld is strengthened. Joint strength reached 300MPa, tensile fracture occurred in the copper alloy, ductile plastic fracture mode.