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In
elctroforged process cross bars are press-locked into unweakened
bearing bars by way of high pressure and electrofusion. The process
is completely automated resulting in high productivity and better
quality.
Round or twisted bars are pressed and simultaneously resistance welded
into solid bearing bars obtaining perfectly homogeneous weld at every
intersection without any air gaps. Thus the grating panels have high
stability, maximum strength and optimum load distribution.
The
scientific endeavor produced outstanding results in terms of quality,
speed and resultant economy. This effectively replaced manually
fabricated gratings. The 1/4" square twisted cross bars or bars as per
customer requirement are welded or electro-forged to the rectangular
shaped bearing bars by a process that combines intense hydraulic
pressure with a powerful electric current. This results in strong,
durable grating suitable for a wide range of application
Advantages
As done in Conventional Method bearing
bars are not punched to accommodate cross bars. Full depth of bearing
bars is effectively utilized thus making electroforged gratings stronger
than conventional gratings made from same steel section.
Electrofusion eliminates
weld defects such as porosity, undercut, blowholes etc. observed in
manual welding. No slag is formed thereby giving better aesthetic value
to the grating.
Automated process with elimination of
punching and clearing gives high productivity. Delivery time is
drastically reduced.
Difference between
Manually Fabricated Gratings Electroforged
Gratings
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Construction is primitive and
orthodox.
Notches are punched along the
bearing bars to allow cross bars to fit in. This weakens the
bearing bars.
Large air gaps lead to poor weld.
Intersections are prone to
rusting as they don’t lend to perfect painting surface finish.
Moderate Strength
Load bearing capacity - 25% less than electroforged gratings.
Cutouts not as strong and stable
as electroforged gratings.
Handmade/ fabricated gratings are
not very precise in dimensions.
Because of arc welding, flux,
which causes imperfect galvanizing leaves behind black spots.
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Construction is highly specific.
Cross bars are pressed into solid
bearing bars without any notches and as such the strength of
bearing bars is not reduced.
Every intersection weld is
homogeneous and hence there are no air gaps.
Homogeneous forged welds give :
High strength to gratings.
High load bearing capacity.
Excellent stability (incomparable
resistance to twisted and bending distortion.
Cutouts have a high degree of
strongness and stability.
Accuracy of dimensions is far
superior. This speeds up fixing operations of gratings. This
means more cost effective.
Perfectly non skid yet smooth
walking surface as cross bars are fully pressed into the bearing
bars. |
Finishing
Hot Dip Galvanized , Powder Coated, PVC
Coated, Self Color, Red Oxide Primer, Other Paints Enamel, Epoxy etc.
as specified.
Grating are mainly of two types :
1. Press locked
gratings
2. Electroforged gratings
Stair Threads
Accessories
Metal Finish Description
Cross bars and bearing bars
The bearing bar steel is of two types
which are produced in equivalent standard.
a ) Plain : The top
surface is smooth & plain.
b) Serrated : The top surface
is serrated for providing more anti slip Property.
Width : 25mm,
30mm, 32mm, 40mm
Thickness : 3mm, 5 mm,
6mm
Centre to Centre Bearing Bar Spacing :
This is the centre distance
between two adducent bearing bar ,
Standard Size 30/ 33 / 41 mm
Cross Bar : The cross bar steel is of
two types
a) Round
b) Square Twisted : Normally Square
twisted bar is used because it provides anti skidding property.
Normally cross bar size is of 6mm.
Centre to Centre Cross bar spacing : Sizes are 50/100
mm
Width
of Grating : It can be produced upto maxm. of 1.0 mtr. width
Length of Grating : Normally 6 mtr. Length.

Product
Application
Gratings are Used in the
following Industries :
Power Plants Oil
Refinery Cement Plant Chemical Plnt Ship
Building
Port Trusts Construction
Sites Fertilizer Plants External fencing and Gates
Flooring and Stairtreads to
walkways and stairways Other Industries
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