By American Welding Society
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Extra info for American Welding Society - User's Guide to Filler Metals
Forthis reason, the properties of asingle-pass weld may be somewhat different from those of amultipass weld made with the same electrode and flux. The weld metalproperties in the specification are determined in the as-weldedcondition, or after a postweld heat treatment, or both. Most of the weld metals are suitable for service in either condition, but thespecification cannot cover all of the conditions thatsuchweld metals may encounter in fabrication and service. For this reason, the classifications require that the weld metals be produced and tested under certain specific conditions encountered in practice.
This is followed by one or twodigitsrepresentingtheminimumtensile strengthrequiredof the weldmetal in 10,000 psi (69 MPa). When the letter “ A follows the strength designator, it indicates that the weld metal was tested (andis classified) in the as-welded condition. When the letter “P’ follows the strength designator, it indicates that the weld metal was tested (andis classified) after postweld heat treatment called for in the specification. The digit that follows the “A” or “P” will be a number or the letter ‘7‘’.
Er, rapid rateof transfer of droplets across the arc does not Penetration of weldsmade with CO, shielding gas is occur unless very high currents are used. 2 Axial spray transfer in argon-oxygen shielding taining substantial amounts of argon or helium generally gas is mainly related to the magnitude and polarity of the result in superior weld metal impact properties. Shielding arc current and electrical-resistance heating of the elecgas mixtures of 50 to 90 percent argon-remainder CO2,or trode. The high droplet rate (approximately 250 droplets 50 to 90 percent helium-remainder CO,, result in higher persecond)developssuddenlyabove a criticalcurrent short-circuiting rates and lower minimum currents and level,commonlyreferredtoasthetransitioncurrent.
American Welding Society - User's Guide to Filler Metals by American Welding Society