推进剂管理装置的可靠性增长及试验验证

采用原始的焊接方式焊接筛网式推进剂管理装置的收集器合格率低、可靠性差。为此,采用纯钛箔作为过渡层进行了不锈钢筛网与钛合金支压板的电阻缝焊试验以及随后这两者与钛合金骨架的电子束焊试验,然后进行了地面力学环境下的振动试验,以验证焊接方式改进后收集器的可靠性。焊接试验结果表明,纯钛箔过渡层一方面可以大幅降低筛网在电阻缝焊时的焊接热量,有效地减小筛网的热变形;另一方面可以在电阻缝焊后形成牢固、封闭的纯钛/不锈钢筛网焊缝过渡区,有效地增加电子束焊时筛网的变形抗力,从而使得焊接后试样的合格率和性能大幅提高。振动试验结果表明,焊接方式改进后收集器的可靠度置信下限从0.90增加到了0.96。

Reliability Growth and Experimental Verification of Propellant Management Device

The adoption of original weld method usually causes the low pass rate and poor reliability of the collector for propellant management device. In order to solve the problem, resistance seam welding tests between titanium alloy bearing plate and stainless steel screen with pure titanium interlayer were performed. Subsequently, electron beam welding tests between the two and titanium alloy frame were performed. Then vibration tests in terramechanical environment were performed to verify the effectiveness of the addition of the pure titanium interlayer. The welding tests results show that the pure titanium interlayer could significantly reduce the welding heat during the resistance beam welding process and further reduced the hot deformation of screen. In addition, the interlayer could form a firm and enclosed pure titanium and stainless steel transition, which could effectively increase the deformation resistance of the screen during the electron beam welding process and further improve the percent of pass and property of welded samples. The vibration tests results show that the improved welding method could increase the lower confidence limits for reliability of collector from 0.90 to 0.96.