(1) Application.- The following Regulations apply
to electrodes of sizes 3/32 inch (12 S.W.G.) and larger in
diameter for metal arc welding of carbon steels having ultimate
tensile strength not exceeding 33 tons per square inch and
Sulphur and Phosphorus contents not greater than 0.06 per
cent each. Electrodes less than 3/32 inch in diameter shall
not be used in boilers.
The electrodes shall comply with the requirements of physical
tests prescribed for each class.
Their characteristics and behaviour under ordinary working
conditions shall be such that satisfactory weld deposits can
be made by a welder of average skill and experience and that
the following characteristics are also obtained:-
|a relative ease in the control of the slag and weld
metal during welding;
|a good degree of stability of the arc and of the fusing
of the covering;
|no undue degree of spatter;
|a fair rate of deposition and depth of penetration;
|easy removability of the slag;
|no undue tendency to under-cut;
|a fair contour of the weld deposits; and
|a low internal porosity of the weld metal.
(2) Classification.- The electrodes shall be classified
| normal penetration electrodes for use in one or more
welding positions; and
deep penetration electrodes for close unprepared butt-welding
in the flat position and/or fillet welding, in the flat
and horizontal vertical positions.
(3) Manufacture.- Electrodes may be made by any method
that shall yield a product conforming to the requirements
of these Regulations.
(4) Size of Electrodes.- The nominal size of the electrodes
shall refer to the diameter of the core wire and the length
shall not exceed 18 inches. Provision shall be made for end
or centre gripping.
The tolerances on the specified diameter of the core wire
of the electrodes shall be plus or minus 0.002 inch.
(5) Covering.- The flux covering shall be sufficiently
robust to withstand the normal conditions of transport, storage,
handling and use, without damage and shall be uniform in thickness
all over so that it fuses evenly. The variation in the thickness
shall not exceed 3 per cent.
(6) (a) Packing and storage.- Electrodes shall be
suitably packed to guard against damage during transportation.
When stored, the electrodes shall be kept in their original
bundles or packings in a dry store room and under such conditions,
the electrodes shall for a period of at least six months be
capable of giving results similar to those which they would
have given on the date of their despatch from the manufacturer.
(b) Marking.- Each package shall be marked with the
Name of the Manufacturer.
Trade name of the Electrodes.
Size and quantity of Electrodes.
Recommended current range.
Classification as per Indian Boiler Regulations.
(7) Tests.- The electrodes shall be subjected to Initial
tests, Periodic check tests and Production control to ensure
that the requirements of these Regulations are fulfilled.
Electrodes intended for use with more than one type of current
or polarity shall be tested using each type of current and
Where any test specimen fails to satisfy the requirements
of any particular test, two further test specimens shall be
prepared using the electrodes from the same batch and submitted
to the same test.
The batch of electrodes shall be accepted as having passed
the test provided that the tests of both the additional specimens
(8) Test Certificates.- The manufacturers shall, when called
upon, produce the results of the most recent Periodic check
tests carried out within the preceding 12 months, on electrodes
representative of the electrodes supplied.