Mechanical Properties on Electron Beam Welds of Constructional High Tension Steels (Report I)

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Square-butt welding was performed on 25 mm thick plates of commercial high tension steels (HT-50, 60 and 80) with electron-beam welding. Two electron-beam welders (conventional high voltage and low voltage types) were used on this investigation and weld heat input was respectively varied with and without preheating. Some results of the mechanical properties of the welds of HT-50, 60 and 80 steels such as hardness distribution, tensile and impact properties were investigated in this paper. Most of welds have had no defects that were detectable by dye penetrant and X-ray inspections. It seemed that only Mn in welds was a little vaporized during electron-beam welding. The maximum hardness of welds was decreased with the adoption of preheating but even in the welds without preheating it was not so high to originate the cold cracks. Most of tensile-tested specimens for the welded joint fractured in the base metal, and all of face and root bended showed the complete bend angle of 180 degrees without any defects. Impact strength of welded joints showed adequate value in HT-60 and 80 steels, but inadequate value in some of weld metals of HT-50 in comparison with the criteria of JIS (Japanese Industrial Standard) and WES (Welding Engineering Standard) Specifications. However the results of these mechanical tests indicate that the electron-beam welds in these high tension steels will be anticipated in practical use for many fields of application,
大阪大学の論文

Mechanical Properties on Electron Beam Welds of Constructional High Tension Steels (Report I)

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