Welding Flame Density and It
Factors, Torch Angle
Welding Technique and Technical
Flame Density:
Heat supplied per unit
area is called flame density.
Torch Angle-
The angle made by the
axle of a torch with an axis of the work piece is called a torch angle.
Factors:
1] As the melting point
of metal to be joint is increasing, the heat required for the unit area of weld
bead is increasing; the flame density is to be increased. It is possible by
increasing the torch angle.
2] As a thickness of
the plate should be joint increasing, the heat required for melting of a unit
area of the plate is increasing. That is the flame density has to be increasing
and it is possible by increasing the torch angle.
3] Thermal conductivity
of the metal to be joint-
As thermal conductivity of the plate is
increased, the heat loss by conduction is increasing; therefore, it is becoming
difficult to rise then joint to the melting point temperature. To compensate
for this loss of heat, the flame density has to be increased, and it is
possible by increasing torch angle.
4] Position of welding-
Irrespective of the
above factor always large torch angle has to be used at the beginning of
welding, and a small torch angle has to be used at the end of welding. At the
beginning of welding because the plates are at room temperature to raise the
temperature from room temperature melting point temperature it needs to supply
more amounts of heat, and hence large torch angle has to be used. At the end of
welding to obstruct the overflow flow of molten metal and formation of crater
defects the smaller torch angle will be used, so that force of flame is
obstructing overflow of molten metal.
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