On the Carbon Dioxide-Sekiguchis Filler Wire-Arc Welding Process

Effect of Shielding With Carbon Dioxide Gas and Merit of Sekiguchi S Filler Wire

Abstract

Various kinds of steel filler wire which contain silicon and manganese, were manufactured for trial. The carbon dioxide-Sekiguchi's filler wire-arc welding process, the C. S. Arc Welding Process for short, was put in operation with them. Then radiographies and bend tests of butts welds and measurements of mechanical properties of all weld steels obtained by this process were carried out.
Moreover the shielding effect of carbon dioxide gas was compared with the effects of the atmospher (air), an argonn gas containing one per cent of oxygen and a mixed gas of carbon dioxide and argon.
Authors confirmed that when the Sekiguchi's filler wires, having suitable contents of silicon and manganesee, were used and the arc and its neighbourhood were shielded with carbon dioxide gas, excellent welds were obtained, but such excellent result was not obtained with shielding by carbon dioxide gas and use of the conventional steel filler wires or without shielding by carbon dioxide gas in the atmospher and with the Sekiguchi's filler wires.
And authors concluded from experimental results that the C. S. Arc Welding Process, which expects the two good effects of use of the Sekiguch's filler wire and shielding of carbon dioxide gas, was predominant in comparison with other various arc welding processes.
In case of welding low carbon steel by this process. the mechanical properties of all weld metal were as follows.
Ultimate tensile strength : 44-48 kg/mm²,
Elongation : 30-36%, (Gauge length=4×dia.)
Reduction of area: 61-67%,
Charpy impact value : 16-20 kgm/cm².
In the end the authors should like to emphasis that a superior quality of weld steel by C. S. Arc Welding Process is secured in virtue of cowork of good effects of Sekiguchi's filler wire and shielding of carbon dioxide gas or mixed gas containing mainly carbon dioxide gas.