Specificaton for ISI marked Steel windows
Before dispatching the material the quality of frames of fabrication is checked as follows:
Requirements of welded joints
Both the fixed and opening frames are constructed of sections which have been cut to the length
and mitred. The corners of fixed and opening frames are welded to form a solid fused welded joint
conforming to the desired requirement. All frames are square and flat. The process of welding
adopted is flash butt welding or any other suitable method which gives the desired requirements.
1. VISUAL INSPECTION TEST
The visual inspection is done by qualified engineers and the welded joint must confirm to the
following:
a) Welds should have been made all along the place of meeting the members
of section and should be without holes & cavity.
b) Welds should be properly grounded.
c) Complete cross section of the corners is properly checked and joints
should be completely solid with no visible cavities.
2. MICRO AND MACRO EXAMINATIONS
From the two opposite corners obtained for visual test, the flanges of the sections are cut with the
help of a saw. The cut surfaces of the remaining portions are polished, etched and examined.
The polished and etched faces of the weld and the base metal are free from cracks and
reasonably free from under cutting, overlaps, gross porosity and entrapped slag.
3. FILLET WELD TEST
The fillet weld in the remaining portion of the joint obtained should be fractured by hammering. The
fractured surfaces are free from slag inclusions, porosity, crack, penetration defects and fusion
defects.
Tee sections for glazing must be tenoned and riveted into the frames and where they intersect, the
vertical tie is broached and the horizontal tee threaded through it, and the intersection closed by
hydraulic pressure.
Casements should be fitted to their frames so as to provide continuous contact for weathering on
the inside and outside and shall be secured in closed position by the fittings which will have been
properly checked and adjusted.
Windows and doors may have holes in webs of the bars other than those required during
manufacture and fixing.
4) SIDE HUNG SHUTTER
For fixing steel hinges, slots are cut in the fixed frame and the hinges inserted inside and welded to
the frame at the back. The hinges were normally of the projecting type, with wall thickness of not
less than 3.15mm and width not less than 65mm and not more than 75mm. The hinge pin and
washer are of galvanized steel or aluminium alloy 51 SWP of suitable thickness.
For fixing hinges to inside frame, the method described for fixing to outside frame may be adopted
but the weld is cleaned or holes are made in the inside frame and hinge riveted.
* Friction hinges may be provided for side hung shutter window, in which case peg stay.
* The handle for side hung shutters is pressed brass, cast brass, aluminium or steel protected
against rusting and mounted on a steel handle plate. The handle plate is welded, screwed or
riveted to the opening frame in such a manner that it could be fixed before the shutter is glazed and
may not be easily removed after glazing.
Non-projecting type of hinges are used as per the requirement of the purchaser. The flat area of mild steel sheet with thickness of not less
than 3mm is used. The hinge pin is of diameter not less than 6mm and washer area of electro-galvanized steel or aluminium alloy.
NOTES:
1) The Dimensions with (*) mark are to be so adjusted as to ensure close fitting of shutter.
2) Hinge box is welded from inside all through the contact length.
3) Hinge flap must take complete round of pin.
