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AWS A5.24/A5.24M:2014 pdf free download

AWS A5.24/A5.24M:2014 pdf free download.Specification for Zirconium and Zirconium-Alloy Welding Electrodes and Rods.
A6.1 Zirconium and zirconium alloys can be welded by gas metal arc, gas tungsten arc, plasma arc, electron beam, and laser beam welding processes. Zirconium is a reactive metal and is sensitive to embrittlement by oxygen. nitrogen and hydrogen at temperatures above I I(X) F 59O°C1. Consequently, the metal should be protected from atmospheric contamination. This can be provided by shielding the metal with high purity inert gas, or by placing in an inert gas chamber ora vacuum of lOw the minus 4 torr 10.0 13 Pal or lower. I)uring arc welding, the zirconium should be shielded from the atmosphere unül it is cooled below about 800°F [430°Cj. Adequate protection by auxiliary inert gas shielding should be provided when welding in air, and for critical applications the welding should be done in a gas tight chamber thoroughly purged of air and tilled with high purity inert gas.
The zirconium metal should be free of heavy oxide and chemically clean prior to welding, as contamination from oxide. water, grease, and dirt will also cause embrittlement.
Zirconium welding rods must be chemically clean and free of heavy oxide, absorbed moisture, grease, and dirt. The welding rod should be kept in the inert gas during welding and the oxide at the tip, formed upon cooling, must be removed before reusing the rod.
Zirconium can be successfully fusion welded to titanium, tantalum, niobium (colunibium), and vanadium although the weld metal will be stronger and less ductile than the base metals. Zirconium cannot be welded to other common structural alloys of copper, iron, nickel, and aluminum as brittle zirconium intermetallic alloys are formed which produce extremely brittle welds.
A7. Description and Intended Use of Electrodes and Rods
A7.I The ERZr2 classification is a “commercially pure” zirconium. It produces weld metal having good strength and ductility. The tensile strength should be at least 55 ksi 1380 MPaI. These electrodes and rods are intended to be used for welding the UNS R60702 zirconium alloy.
A7.2 The ERZr3 classification contains tm as an alloying element. Tin increases the strength of the weld metal, yet allows it to retain good ductility. The strength should be at least 60 ksi [410 MPaI. These electrodes and rods are intended only for welding UNS R60704 zirconium alloy. Weld metal from ERZr3 filler metal may not resist corrosion as well as that from ERZr2 filler metal.
A7.3 The ERZr4 classification contains niobium (columbium) as an alloying element. It produces weld metal of good ductility with a tensile strength of at least 8() ksi 1550 MPaI. AWS A5.24/A5.24M:2014 pdf free download.

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