Electron Beam Welding

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Hi to everyone,I am an engineer working at the Fermilab (Batavia, IL). I am measuring the height of the root reinforcement in some full penetration butt welds Nb samples. I have 1.5 mm (in the weld point) thick Nb sheets samples and I measured a 300 microns root penetration height.I am looking for some relations between the root reinforcement height and the thickness of the two metal sheet in order to predict the root reinforcement behavior for a 3mm thick sample.Do you have any suggestions?Thank you very much,Carlo
Reply:Nb composition? Pure? Alloyed? C-103? Are you welding SRF cavities or a superconductor application?EBW manufacturer/model & kV?You have the 300 micron root data on the 1.5mm samples.  Are you prevented from emperically obtaining the root reinforcement height for the thicker 3mm samples?  No 3mm samples for testing? The tests would provide you with the answer.  Believe the results will not be linearly dependent, but vary as an unkwn exponent of the beam's spectral output delivered to the joint.And surely you have particle physicists on-sit to aid in the prediction??"Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:ManoKai, on-sit ? Do you mean in situ ? Thats a good particle physicist pun
Reply:Thank you for the prompt answer ManoKai. I have pure Nb and the welding is for 3.9 GHz SRF cavities equator. The manufacturer is Sciaky. Maybe in the future I will discover more specifications about this welding sample. I will let you know.I know that the root reinforcement height depends mainly on travel speed and the beam characteristics. But I'm trying to figure out if there is also a correlation with the welding metal thickness. Probably the best thing to do is find some 3 mm samples and measure them.
Reply:I Originally Posted by Carlo....Probably the best thing to do is find some 3 mm samples and measure them.
Reply:Fermi Report on Welded SRF Cavities.  Lance Cooley ring a bell?"Discovery is to see what everybody else has seen, and to think what nobody else has thought" - Albert Szent-Gyorgyi
Reply:Yes we work on the same floor. I spoke with him and he suggested me the same thing you suggested me. Probably I find where to get some 2.4 mm samples. I will write updates.Thank you