(a) The following provision shall apply to filler rods for gas welding of boiler parts and steam-pipes:

(i) Manufacture.- The filler rods may be made by any method that shall yield a product conforming to the requirements of these regulations.

(ii) Size of Rods.- The nominal size of rods shall refer to the diameter of the rod which shall be expressed in millimeter . The tolerances on the specified diameter of the rod shall be plus or minus 0.05 mm for rods 1.6 mm (1/16 inch) and over in diameter, and plus or minus 0.03 mm for rods less than 1.6 mm in diameter.

(iii) Packing and Marking.- The filler rods shall be suitably packed to guard against damage during transportation and each package shall be marked with the following informations:-

(iv) Test.- The rods shall be subjected to initial tests and periodic tests to ensure that the requirements of these Regulations are fulfilled.

(v) Test Certificate.- The manufacturer or user shall where called upon by the Inspecting Authority or the Chief Inspector of Boilers produce the results of the most recent periodic check test carried out on filler rods representative of the rods specified.

CHEMICAL COMPOSITION AND APPLICATIONS

(vi) CARBON STEEL FILLER RODS (GRADE I)

(a) Chemical composition.- The Chemical composition of the rods shall be as given below:-

Carbon max………………… 0.10%

Manganese max……………. 0.60%

Nickel max…………………. 0.25%

Sulphur max………………… 0.050%

Phosphorus max…………….. 0.050%

(b) Application.- These rods are intended for application where a minimum butt-weld tensile strength of 35.0 kg./sq. mm. (22.0 Tons/sq. inch) is required.

(vii) Carbon Steel Filler Rods – (Grade II)

(a) Chemical Composition.-

Carbon ……………………. 0.10% to 0.20%

Silicon…………………….. 0.10 to 0.35%

Manganese………………… 1.00 to 1.60%

Sulphur max………………. 0.040%

Phosphorus max…………….. 0.040%

When the carbon content is in the range of 0.10 to 0.12% the manganese content shall be not less than 1.20%.

(b) Application.- These rods are intended for application where a minimum butt-weld tensile strength of 44.0 kg./sq. mm. (28.0 Tons/sq. inch) is required.

(viii) Carbon Molybdenum Steel Filler Rods.

(a) Chemical composition.- The Chemical composition of the rods shall be as follows:-

Carbon …………………………. 0.15% max.

Silicon………………………….. 0.25% to 0.50%

Manganese……………………... 0.60 to 1.50%

Molybdenum…………………… 0.45 to 0.65%

Chromium & Nickel…………… Not more than 0.20% each (if present as a residual)

Sulphur………………………… 0.040%

Phosphorus…………………….. 0.040%

(b) Application.- These rods are intended for welding of (alloy steels of the) ½% molybdenum type with or without chromium.