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Effect of parameters in flash butt welding
Flashing Feed Rate: If excessive, there is a probability of the parts freezing together without welding. If this is insufficient, intermittent flashing will occur resulting in insufficient heating in the material.Flashing Time: If excessive, the material becomes too plastic to upset properly. If this time is less, the plasticity attained is not sufficient.Flashing Current: If this is more than required, excessive flash is found in the weld : deep craters are formed causing pockets and inclusions in weld. If ot herwise, there is a tendency for the materials to freeze; lack of plasticity is also caused.Upsetting Current: Too much of this parameter, causes burning or oxidation of the material even to the extent of blowing out metal. Excessive deformation also results. On the contrary, too less of upsetting current results in longitudinal cracking through weld area; inclusions and voids are not properly forced out of weld.Upsetting Force: Excess of upsetting force causes the flow lines of the material to bend perpendicular to the welded job axis. As a consequence, poor weld results in. If upsetting force is inadequate, oxides, inclusions and voids can be found in the weld; cast metal may be retained in the weld.
Explain the several types of pattern allowances with neat sketch. Show the six important - aspects of gating system design. Illustrate briefly their functions.
Magnitude, direction and position of resultant force: Q : A horizontal line PQRS is 12 m long, and PQ = QR = RS = 4m. Forces of 1000, 1500, 1000 and 500 N act at P ,
Embrittlement For use, at high strength, coupled with good notch toughness, all weld structure must be Tempered low carbon martensite. Carbon and alloy steels having more than
DENSIT Y (ρ ): Density is defined as mass per unit volume; Density = mass/ volume; = m/v, kg/m 3 P for Hg = 13.6 × 103 kg/m 3 for water = 1000 kg/m 3 Specifi
(a) Illustrate reversible, irreversible and Quasi-static process with examples. (b) What do you mean by terms change of state, path, process, property, cycle. (c) Distinguish
Stress Strai n Curves (Tension): When a bar or specimen is subjected to a gradually increasing axial tensile load, the strains and stresses can be found out for number of loa
Nitrides, Silicides and Sulfides Nitrides contain very high melting point but initiate to oxidize at low temperature. They have poor resistance also to chemicals. Boron nitrid
HEAT LOSS IN CYLINDRICAL PIPE,PHYSICS
procedure to find resultant of several forces acting at a point
I want complete information about the topic torsion of cylinder and torsion rigidity.if I have to make a project on this topic then how should I make it. Please help me sir.
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