Mechanical Properties on Electron Beam Welds of Constructional High Tension Steels (Report V)
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概要
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The effects of welding condition and chemical composition on the occurring characteristics of weld porosities were studied in this investigation by using twenty different constructional steels of 40 to 80Kg/mm^2 in strength. The remarkable conclusion are as follows. (1) The bead shape changes from wedge shaped-type to wine cup shaped-type with an increase of a_b parameter, and the penetration depth becomes to be maximum at a_b: 0.9. (2) The weld defect of porosities occurred in weld metal were roughly divided into two classes, that is "Root porosity" in the bottom of weld penetration and "A-porosity" in the middle part of weld penetration. (3) The amount of A-porosity occurred is the most in case of a_b: 1.1. Meanwhile Root-porosity is decreased with an increase of a_b parameter. (4) A-porosity tends to be decreased with an increase of weld heat input and it is increased with an increase of nitrogen or oxygen content in steel. (5) Concerning to the occurring of weld porosities the allowable limit in quantity for nitrogen and oxygen contents in steel is less than about 60 and 70ppm in case of 15KJ/cm weld haet input, respectively, and in general it is raised with an increase of weld heat input. (6) In general the impact strength of the weld metal is irrespective of the variation of weld heat input within a limit of this investigation. Furthermore the impact strengths for most of weld metal are satisfied with maximum value prescribed by JIS or WES Specification, with the exception of some of HT60 and 80 weld metals.
著者
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MATSUDA Fukuhisa
Osaka University
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ARATA Yoshiaki
Osaka University
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FUJIHIRA Shouichiro
Katayama Iron Works Ltd.
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SHIBATA Yutaka
Katayama Iron Works, Ltd.
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ONO Yoshihisa
Katayama Iron Works, Ltd.
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TAMAOKI Mitsuo
Katayama Iron Works, Ltd.
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Matsuda Fukuhisa
Osaka Univ.
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