Welding methods

The changing of welding method to the vibro-contact has caused a lowering of own tensile stress to 180 MPa, whereas in the joint the stress is close to zero After annealing the maximum value of stress has reached 20 MPa... 

As in the case of many metal—ahoy systems, weld ductihty is not as good as that of the base metal. Satisfactory welds can be made in vanadium ahoys provided the fusion zone and the heat-affected zone (HAZ) are protected from contamination during welding. Satisfactory welds can be made by a variety of weld methods, including electron-beam and tungsten-inert-gas (TIG) methods. It is also likely that satisfactory welds can be made by advanced methods, eg, laser and plasma techniques (see Lasers Plasma technology). 

Explosion, Bulge Test, used to evaluate welding methods is briefly described by C.G.Dunkle,... 

Because of their high thermal stability and excellent resistance to solvent, fluorocarbons cannot be joined by solvent cementing, and they are very difficult to join by thermal welding methods. Because of their inertness and low surface energy, they also tend to be difficult materials to join by adhesive bonding. Surface treatment is necessary for any practical bond strength to the fluorocarbon parts. 

Welding method Pass No. Welding current, A Arc voltage, V Welding speed, m/h Wire feed speed, m/h... 

Welding method Heat treatment UTS, MPa KCV, J/cm2 Fracture location... 

These results do not give true values of the number of cycles to fracture and, therefore, true values of fatigue life of welded joints. However, they allow draw a conclusion that performance of welded joints in alloy T110 under cyclic load Omax = 500 MPa does not depend upon the welding method, provided that welds contain no technology defects. 

The number of cycles the defect-free welded joints in alloy T110 can withstand does not depend upon the welding method. 

The experimental titanium alloy T110 produced by EBCH melting, subjected to plastic deformation and heat treatment, has characteristics of strength at a level of commercial alloy VT22, and is superior to this alloy in ductility and fatigue strength. The alloy is well-weldable with any fusion welding method. 

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