M. Gilchriese Glued Fittings October 26, 2005. M. Gilchriese 2 Samples and Prep Three samples using Hysol 9396 Seven samples using Hysol 9394 Surface.

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Presentation transcript:

M. Gilchriese Glued Fittings October 26, 2005

M. Gilchriese 2 Samples and Prep Three samples using Hysol 9396 Seven samples using Hysol 9394 Surface prep tubes –Sandpaper(600) with alcohol –Wash with alcohol –Wash with acetone Surface prep fitting –Brass wire brush with alcohol –Wash with alcohol –Wash with acetone Irradiate to about 25 MRad He leak -> P to 15.5 bar -> He leak -> irradiate -> P to 15.5 bar -> He leak. Vacuum inside part.

M. Gilchriese 3 Samples After Irradiation Note that epoxy turns blue-like color. No evidence of epoxy running.

M. Gilchriese 4 Before/After Comparison Small weight gain. Note that did not try to control electrical contact between fittings and pipe. Resistance after. Did not measure before. Change in leak rate not significant. Small change from setup on different days. Fine after about 100 thermal cycles. Next step is high pressure He test. Making setup.

M. Gilchriese Pictures

M. Gilchriese Pictures

M. Gilchriese 7 Cross Section Tube in about Correct Longitudinal position

M. Gilchriese 8 Cross Section Tube not Fully Inserted Big void Glue film

M. Gilchriese 9 First Conclusion Promising but need more testing. Simple mechanical test completed(9394B) by constraining tube and applying torque to fitting. Tube deformed first, glue joint did not break. Stopped and leak checked OK. In process of setting up shear tests that will compare irradiated to non-irradiated. And 9394 to Need more tests in C3F8 not irradiated and irradiated to understand penetration into epoxy. Bulk epoxy samples. Assuming all is OK, better control of glue application and assembly. These samples were done in a hurry. Need to understand importance of guaranteed electrical contact. Believe can make contact (by tube contact with fitting at end), which could be checked during assembly. Long term?

M. Gilchriese 10 Capillaries Six samples made with Hysol 9394 All pass He leak -> P to 20 bar -> He leak, Vacuum in part. Setting up to irradiate 4 in C3F8. Will keep other two at 20 bar in the meantime.

M. Gilchriese 11 Capillary Samples