AS 4413-1996 pdf free.Steel tubes – Pressure application – Flash butt welding.
AS 4413 sets out general requirements for the flash butt welding of steel pipes. tubes and fittings, for pressure equipment and other pressure or high duty applications, carried out on automatic hash butt welding machines.
1.2 OBJECTIVE The objective of this Standard is to establish reliable methods for the satisfactory automatic flash butt welding of steel tubes and fittings for pressure purposes.
1.3 APPLICATION This Standard is specifically intended to apply to the automatic flash butt welding of carbon steel, low alloy steel and high alloy steel tubes and fittings.
1.4 DEFINITIONS For the purpose of this Standard, the definitions given in AS 2812 and those below apply.
1.4.1 May—indicates that a statement is optional.
1.4.2 Parties concerned —the purchaser, designer, manufacturer, design verifying and inspection bodies, supplier, installer, owner and regulatory authority, as appropriate.
1.4.3 Regulatory authority —any Commonwealth, State or Territory regulatory authority in Australia with the jurisdiction for pressure equipment safety and includes an officer of that authority with delegated responsibility by that authority.
1.4.4 Shall—indicates that a statement is mandatory.
1.4.5 Should—indicates a recommendation.
1.5 PARENT METAL The parent metal shall be carbon steel, low alloy steel or high alloy steel complying with the requirements of Australian or other equivalent Standards and shall be suitable for the intended application.
The steel or combination of steels selected shall he shown by the procedure qualification tests (see Section 5) to be capable of being satisfactorily flash butt welded.
1.6 SIZE OF TUBE The diameter, thickness and length of tube which can be flash butt welded depends on the capacity of the machine to he used and it shall be determined by the procedure qualification tests that the tubes come within this machine capacity (see Section 5).
1.7 BACKING GASES Where backing gases are required to minimize flash and oxidation in the bore of the tube, dry air, argon, a mixture of 8% nitrogen—12% hydrogen, or other suitable gas mixture, as agreed between the parties concerned may be used.
The type of backing gas and the pressure at which it is to function depends on the type of material being welded and the dimensions of the tube. The gas to be used, the pressure at which it is to be supplied and the flow to provide an adequate positive pressure at the weld shall be determined when fixing the welding procedure. The same conditions shall then he used for production welds.AS 4413 pdf download.