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Titanium Filler Wires

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Commercially pure titanium and most titanium alloys are readily welded by a number of welding processes being used today. The most common method of joining titanium is the gas tungsten-arc (GTAW) process and secondarily, the gas metal-arc (GMAW) process. Others include electron beam and more recently laser welding as well as solid state diffusion bonding. Titanium and it's alloys also can be joined by resistance welding and by brazing.The techniques for welding titanium resemble those employed with nickel alloys and stainless steels. To achieve sound welds with titanium, primary emphasis is placed on surface cleanliness and the correct use of inert gas shielding. Molten titanium reacts readily with oxygen, nitrogen and hydrogen and exposure to those elements in air or in surface contaminants during welding can adversely affect titanium weld metal properties. As a consequence, certain welding processes such as shielded metal arc, flux cored arc and submerged arc are unsuitable for welding titanium. In addition, titanium cannot be welded to most other metals because of formation of embrittle metallic compounds that lead to weld cracking.

Welding Environment :-

While chamber or glove box welding of titanium is still in use today, the vast majority of welding is done in air using inert gas shielding. Argon is the preferred shielding gas although argon-helium mixtures occasionally are used if more heat and greater weld penetration are desired. Conventional welding power supplies are used both for gas tungsten arc and for gas metal arc welding. Tungsten arc welding is done using DC straight polarity (DCSP) while reverse polarity (DCRP) is used with the metallic arc.

Grade(AWS A 5.16)Size(mm)Typical Analysis of Filler WireTypical All Weld Mechanical PropertiesApplications
COHNFeTiY.P.N/mm2(ksi)T.S. N/mm2(ksi)EI.(%)I.V.J(kgf-m)
ER Ti-12.43.24.05.0Length10000.300.1000.0050.0150.100Bal.172(25) min241(35) min24 min-For welding commercial pure titanium alloys commonly found in application requiring high temp. resistance and resistance to chemical re-agents.
ER Ti-20.030.1000.0080.020.200Bal.345(50)276(40)20-Most widely used titanium alloy for industrial application because of its good balance of strength.
ER Ti-50.050.1800.0150.030.300Bal.AI5.5-6.7V 3.8-4.5827(120) min896(130 ) min10 min-For high Fatigue strength, toughness,and are heat treble.
ER Ti-50.030.100.0080.0200.020BalPd 0.12-0.25This alloy extends the use of titanium into mildly reducing media, to much higher chloride levels, or where the environment fluctuates between oxidizing and reducing.
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