Impact Values of Weld Metals Obtained by CO2-O2 Arc Welding Process (Report 1)
Effects of Oxygen Contents in Supplied Gas on Impact Values of Weld Metals of a Rimmed Steel
1966 Volume 35 Issue 10 Pages 1000-1006
Details
1966 Volume 35 Issue 10 Pages 1000-1006
A rimmed steel (0.20% C, 0.01% Si, 0.49% Mn) was welded using CO2-O2 arc welding process with eight electrode wires. The silicon and manganese contents in each electrode wire were varied (0.33-1.26% Si, 1.44-0.90% Mn, respectly). Effects of chemical compositions of electrode wires and oxygen contents in supplied gas on V-notch Charpy impact values of weld metals were investigated and the following results were obtained:
(1) Impact values of weld metals are generally increased with addition of oxygen to supplied gas, if electrode wires contain sufficient amounts of silicon and manganese.
(2) Impact values of weld metals are high when silicon and manganese of electrode wires are contained in the field in which unsaturated silicate is produced by deoxidizing reaction with silicon and manganese in molten iron. But if electrode wires contain large amounts of non-metallic inclusions, the values are not always high, though their silicon and manganese contents may be the same as the above mentioned.
(3) Therefore it is necessary to minimize the amounts of non-metallic inclusions of electrode wires as much as possible to increase the impact values of weld metals.
