On the Brittleness of Heat-affected Zone (Report 3):Distributions of impact resistance of welded part by low-hydrogen and ilmenite type electrodes
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概要
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The authors reported in previous announcements about the change of properties in the heataffected zones. Generally, it is known that the weld metal made by low-hydrogen type electrode has the superior toughness comparing with the one made by ilmenite type electrode, and the transition temperature is lower, so possesses the excellent properties even at low temperatures. In this report the authors investigated the toughness at fusion-line of both low-hydrogen type and ilmenite type. As a result of investigation it is recognized that the excellent toughness of lowhydrogen type depends not the action of hydrogen but that of nitrogen and oxide-inclusion of low melting point. The position at which the crack initiates and develops is different according to the types of electrodes.<BR>As a result it was concluded that :<BR>1) Low-hydrogen type shows the superior toughness at both weld metal and fusion line comparing with ilmenite type, and the reason of this difference is the low contents of nitrogen and oxygen.<BR>2) Crack of low-hydrogen type weld metal develops in the heat-affected zone if notched to the fusion line, and that of ilmenite type does so if notchedin the direction of weld metal.<BR>3) Increase of toughness after 600°C. heat-treatment is caused by the escape of hydrogen, but very slight.<BR>4) The heat-affected zone at which the temperature rise during weld is estimated about 720°C (A1-transformation point) shows low toughness irrespective of the types of electordes, and this will de caused only by the effect of heat.
- 一般社団法人 溶接学会の論文
一般社団法人 溶接学会 | 論文
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