Effect of parameters in flash butt welding, Mechanical Engineering

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.

Posted Date: 9/17/2012 4:14:27 AM | Location : United States







Related Discussions:- Effect of parameters in flash butt welding, Assignment Help, Ask Question on Effect of parameters in flash butt welding, Get Answer, Expert's Help, Effect of parameters in flash butt welding Discussions

Write discussion on Effect of parameters in flash butt welding
Your posts are moderated
Related Questions
validity on compressible and incompressible fluids

Steels Plain carbon & C - Mn steels : Because of low heat input, in as welded condition, the micro structures of the autogenous process welds predominantly show marten

EXPALIN PREPARATION OF LYOPHILIC AND LYPHOBIC SOLS

STATE - Thermodynamics: The State of system is its condition or configuration described in detail. State is the condition of the system which is identified by thermodynamic

A hole of 25 mm diameter and 62.5 mm depth is to be drilled. The suggested feed is 1.25 mm/rev.and the cutting speed is 60 m/min. Assume the clearance height is 5 mm. Determine: f

what are the parts of wilson hartnell governor with their designation?

Q. Modularization of Steam Generators? Vendor shall design and fabricate the high pressure Steam Generators so that a minimum of field assembly will be required. Module ship

Why is back rake angle preferred to be negative for brittle materials?

opitz system in group technology