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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.
corrosion in boilers is prevented or minimized by maintaining of boiler water
Q. Explain working of Tubesheets? The tube and tube pitch selected shall be approved by WorleyParsons Canada. The preferred tube pitch shall be a minimum of 1.3 x tube OD and
Q. Explain about Surface Preparation? All oil, grease, salts, and any other contaminants detrimental to the formation of a good coating bond or coating quality must be removed
what is fluctuation of speed
Pressure - Thermodynamics: While working in the system, thermodynamic medium exerts a force on boundaries of vessel in which it is kept. The vessel may be a container, or an e
Objectives After studying this section, you should be capable to: known properties that are essential to be present in a material for high temperature applications,
Registering a Small Scale Unit: Small Scale and ancillary units (i.e. undertaking with investment in plant and machinery of less than Rs. 6.0 million and Rs. 7.5 million respectiv
Determine the force to pull box along a level surface: A metal box having weight 10KN is pulled along a level surface at the uniform speed by applying horizontal force of 350
i wanna know is production job is best or marketing after doing btech
(a) How are the cutting fluids classified ? Explain every class with a couple of lines. (b) A carbide cutting tool has tool life exponent n = 0.27. It gives a tool life of 60 mi
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