Impact Values of Weld Metals Obtained by CO2-O2 Arc Welding Process (Report 2)
Effects of Non-metallic Inclusions on Impact Values of Weld Metals of a Rimmed Steel
1967 Volume 36 Issue 9 Pages 1003-1009
Details
1967 Volume 36 Issue 9 Pages 1003-1009
In the previous report, it was deduced that the non-metallic inclusions of an electrode wire affected the impact value of weld metal. The impact value of weld metal first increased and then decreased in some cases, but in other cases simply decreased with an increase of oxygen content in supplied gas for CO2-O2 arc welding. This result may be also attributed to the compositions or inclusions of electrode wires. The object of this paper is to clarify these points by some experiments.
A rimmed steel was welded with various electrode wires by CO2-O2 arc welding process. Some methods for the determining of inclusions were experimentally compared and discussed. And microscopic measurement and electrolytic isolation were carried out to determine the inclusions in electrode wires and weld metals.
The results obtained are as follows;
(1) It was experimentally concluded that the amounts of inclusions of electrode wires affect those of weld metals.
(2) The impact values of weld metals obtained by electrode wires containing small amounts of inclusions first increased and then decreased in a range of oxygen content of 10 to 25%.
(3) In this case, the amounts of inclusions of the weld metals were generally small and were not changed remarkably by addition of oxygen to supplied gas.
(4) But if the electrode wire contained a large amount of inclusions, the impact value of the weld metal simply decreased and the amount of inclusions of weld metal increased with an increase of oxygen content in supplied gas.
