Below we name concisely the most essential results of research and investigations made by this site's author:

  1. There were studied some peculiarities of thin metal materials welding - without a filler material usage, especially in a pulse mode, when each weld is a family of many the so-called identical points-spots, produced by consecutive carrying out of welding current pulses.
  2. It was shown that for materials, containing easy evaporated components (Zn, Ag, etc.), the points overlap has to be as maximum as 66-71% of the single point-spot length. It is better when this overlap is minimal (up to 55-60%).
  3. It was proposed the model of the edge weld in ideal assembling conditions and with gaps between edges or while they are shifted - each to other. Possibilities of welding - while the assembling errors existence - have been proved and realized. There are created the principles of such equipment building which permit to make edge (or flanged butt) welds when gaps are up to 200% of material thickness and edges displacement is nearly 300%. The minimal raising of edges - under heat deflection and fixing rigging - has to be at the range of 3-4 and 5-7 material thicknesses (for continuous and impulse mode of welding, accordingly), if the assembling errors are absent. In this case the optimal edge weld has almost cylindrical shape with a radius which usually more than edges thickness on 25-75%. For these conditions in the majority cases the lenght of welding pool (bath) has to be 3-6 times more of the edge thickness. Usually it is relevant due to the both edges melting of up to 250% of each of them thickness. In the case of large errors the mentioned raising may be up to 12-14 thicknesses (and even more), dimensions of a weld are essentially grew up, but we need to use a special form of welding current pulses which have been forecasted and developed by this site's author.
  4. It was found possibilities of "boiling" steel (low carbon material with large abilities to deformations) thin lap-joint fulfillment - without using of filler material in the cheap atmosphere.
  5. The weldability of some palladium and platinum alloys were studied. It was grounded the expediency of argon-hydrogen (up to 7% in volume) mixtures usage for palladium based materials welding, and some original gas atmospheres are proposed for platinum-based materials welding.
  6. Two actual obtstacles of foils (Pd+10-30%Ag) welding have been overcome: porosity and cracks. It was shown that in order to avoid last of them we have to limit the speed of the HAZ heating (in the temperature interval of 400-870 degrees) no more than of 2000-3000 degrees per second. The post heat treatment is also very useful. Optimal parameters of palladium based foils welding have been found.
  7. The request to hydrogen filters constructional materials properties have been firstly formulated: hydrogen resisting; closeness of thermal extension to palladium alloys; absence with them of the so-called contact melting; resistance to corrosion; high cleanness - with the point of view of gas impurities which would make dirty the produced extra pure hydrogen.
  8. It was developed the method of Pd-based foils welding with the mentioned before constructional materials based on obtaining of the austenitic metal of a weld. Some steels and nickel alloys were found for the purposes of extra pure hydrogen filters producing.
  9. There were found different types of hydrogen filters made from the palladium-based foils with thicknesses 0.02-0,1 mm: flange (one and both sides); disc; bellow ; bag; flag.
  10. It was shown the possibility of improvement of static strength of foils edge welds (on 10-12%), and it was proposed how to increase edge welded bellows working resources.
  11. Some methodologies of thin metals welds microstructure studying have been found. A lot of welds examples has been investigated. There are shown that pulse welding permits to receive various level of welds structure fragments reducing, while very often continuous welding gives dendrite and unfavourable structures.
  12. For thin-walled structures the original combined welding-brazing methods are proposed as well as some simple original devices for their realization.
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