Arc weldability

This alloy has satisfactory arc weldability (with filler metal 5356), and after welding, mechanical properties equivalent to those of the parent metal in the T4 temper can be achieved. However, it shows a strong sensitivity to exfoliation corrosion in the heat-afifected zone, on either side of the welding bead (See Section B.6.4.2 and Figure B.2.11). This handicap severely limits its use in welded structures to very specific applications that are subject to frequent inspection. 

Effect of rare earths on surface tension 6.6. Arc weldability 43... 

Of the weldability problems, nickel and nickel-based alloys are particularly prone to solidification porosity, especially if nitrogen is present in the arc atmosphere, but this may be controlled by ensuring the presence of titanium as a denitrider in the filler and maintaining, a short arc length. The other problem that may be encountered is hot cracking, particularly in alloys containing Cr, Si, Ti, Al, B, Zr, S, Pb and P. 

Birley, S. S., Hepples, W. and Holroyd, N. J. H., The Corrosion Protection of Weldable 7xxx Aluminium Alloys by Aluminium-based Arc Spray Coatings , in 3rd Int. Conf. on Aluminium Alloys Vol II, Sintef, Trondheim, 497-502 (1992)... 

Sonic of the supcralloys can lie welded hy arc melting processes, as well as hy resistance and electron-beam techniques. Alloys having low contents are reudily weldable. 

Aluminum alloy 6013 is a relatively new heat treatable alloy of medium strength that derives its heat treat response from the precipitation of magnesium-silicon and an Mg-Si-Cu-Al phase. Alloy 6013 is weldable by GTA, MGA, and resistance methods. It has similar weldability to 6061 when welded by arc methods using 4043 or 4063 hllers and has weld strengths typically 27 to 40 MPa (3.9 to 18 ksi) higher than 6061. 

S. Lathabai, K.J. Barton, D. Harris, P.G. Lloyd, D.M. Viano, and A. McLean, Welding and Weldability of AZ31B by Gas Tungsten Arc and Laser Beam Welding Processes, Magnesium Technology 2003, H.I. Kaplan, Ed., TMS, 2003... 

Care must be taken to measure the arc voltage, which is likely to be lower than the voltage indicated on the welding set because of potential drop along leads, etc. The scale of heat input on the weldability diagrams relates to the manual metal-arc process with an assumed arc efficiency of 80%. Other processes are included by comparing their arc efficiencies with that of the manual metal-arc process. Some typical approximate figures are ... 

Throughout the world, many arc welding methods are used to fabricate large-capacity structures from these steels. The weldability of both steels was evaluated using various methods of welding. Thin samples of both steels were satisfactorily welded. Nevertheless, weld metal of the same composition was susceptible to pore and hot crack formation and resulted in decreased ductility and low impact strength at low temperatures. Both steels were sensitive to the welding heat effect this was... 

Answer by author The most important considerations were the weldability of the bellows and their ability to withstand mechanical shocks and other possible accidental mistreatment. A two-ply stainless steel bellows was chosen, each ply of which was approximately 0.008 m thick. This was welded into the can by a standard inert-gas-shielded-arc method. 

The heat-resistant steels are weldable by the usual processes, with arc welding preferred over gas fusion welding. For the ferritic steels, the tendency to grain coarsening in the heat affected zone has to be kept in mind. The application of austenitic filler metals will lead to better mechanical properties of the weld connection than those of the base metal (however, with respect to the scaling resistance, different thermal expansions of the ferritic and austenitic materials may be a problem). Filler materials should be at least as highly alloyed as the base metal. In sulfurizing atmospheres it is advisable to use ferritic electrodes for the cap passes only in order... 

Weldii. Ti-3A1-2.5V has good weldahiHty and, like all titanium alloys, is weldable by all methods except shielded arc welding and submerged arc welding (because no flux is permitted). 

Weldability. Lake other titanium alloys, Ti-5Al-2.5Fe can be welded, but preferably by the more sophisticated methods such as gas tungsten-arc and electron beam welding. Other precaution-aiy procedm-es such as preheating, postheating, control of interpass temperattu-e, and control of environmental conditions should be used. 

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