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Volume 31, Issue 10
Displaying 1-6 of 6 articles from this issue
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Tatsuya Hashimoto1962 Volume 31 Issue 10 Pages 796-805
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
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What should we study from Them?Haruyoshi Suzuki1962 Volume 31 Issue 10 Pages 806-813
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
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Properties of Weldment for Stainless SteelsToshikage Ikkai, Fuminori Watanabe1962 Volume 31 Issue 10 Pages 814-820
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSBonded fluxes have been recently brought into the Japanese market by Arcos Corporation. These fluxes are prepared with same manufacture as coated electrodes, and weld metal can be deposited with exact chemical contral. Then, at the results of study, we have also manufactured domestic products of bonded fluxes.
Particularly in this report are described properties of weld metal for stainless steels concerning the domestic product fluxes. The purpose of paper will be briefly writed as follows.
(1) This self-removing slag produces clean weld beads. (2) All deposit metals are excellent against corrosion resistance, impact test in the low temperature and thermal fatigne test. (3) Hot cracking are prevented according to prepared ferrite value in the structure.View full abstractDownload PDF (6416K) -
Effect of Metallurgical Structure of Deposited MetalOtomaro Takagi, Shigeru Nishi, Kazuhisa Suzuki1962 Volume 31 Issue 10 Pages 821-833
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSContinuing from Report 1, this report deals with the effect of metallurgical structure of single and multiple pass deposited metal in submerged and CO2 gas arc welding on the notch-tough ness of deposited metal in automatic arc welding. It was found that when deoxidization of deposited metal was satisfactory, the effect of grained refining of metallurgical structure was exhibited and was extremely effective for improvement of notch-toughness of deposited metal.View full abstractDownload PDF (10319K) -
Kazuo Kato1962 Volume 31 Issue 10 Pages 834-839
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThe author investigated the distribution and segregation of sulphur in mild steel weld-metals, using radioisotope S35 and autoradiograph. 5 mC of S 35 is introduced into the coatings or the core wires of arc electrodes or the core wire of unionmelt welding. One pass or multi pass weld-metals were produced using these materials. Autoradiographs on the sections of these specimens were obtained after 15 to 120 days of exposure. From these experiments, the following results were obtained.
(1) In the case of hand welding, the striped patterns perpendicular to the dentritic structure were found on the autoradiographs, but there was no such a remarkable segregation of the top area or the boundaries of dendrite as usually found in steel ingot.
(2) Similar striped patterns were found in the bottom area but striped patterns parallel to the dendritic structure were found in the middle or top area of weld-metals, in the case of unionmelt welding.
(3) These results show that sulphur segregates to the boundaries of dendrite in the case of rapid cooling rate, but does in stripes parallel to the locus of the solidification line of weld-bead in the case of slower cooling rate.View full abstractDownload PDF (2643K) -
Examination of The Results of FISCO Type Cracking Test and Comparison between Four Types of Cracking TestHaruyoshi Suzuki, Michio Inagaki, Harumasa Nakamura1962 Volume 31 Issue 10 Pages 840-850
Published: October 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSWeld cracking susceptibilities of various austenitic stainless steel electrodes in the market were investigated with FISCO type cracking test which was found very useful for the cracking test of austenitic stainless steel welds as shown in the previous report. The shape and microstructure of weld metals in the FISCO test were examined. Four types of hot cracking tests, including the FISCO test, were compared in respect to the sensitivity and reproducibility. The main conclusions are summarized as follows :
(1) D347 type electrodes were generally more hot-crack-sensitive than D308 type, D308 L type and 16 Cr-8 Ni-2 Mo type electrodes.
(2) Crack susceptibilities of D347 type electrodes varied in a wide range with the type of coating and description, regardless of the ferrite content from 6 to 9 % in weld metals.
(3) Longitudinal bead cracks in austenitic stainless steel welds are likely to be caused through a chain of micro-cracks in grain boundaries at or beneath the bead surface by shrinkage stresses and then propagated through weld metal within the temperature range from 1100°C to 500°C.
(4) Bead cracking increased with the ratio of width to depth in the bead section and was more serious in V-or U-groove than in I-groove.
(5) Crack-sensitive D347 type weld metals had heterogeneous and coarse-grained structures for a small heat input, while crack-insensitive weld metal was rather homogeneous and fine-grained. It seems to be attributed to a greater content of molybdenum in the latter.
(6) The FISCO type cracking test was more preferable to three other types of cracking test, that is, double fillet, segment circular groove and modified Lehigh restraint tests, in respect to the sensitivity and reproducibility for the hot cracking test of austenitic stainless steel welds.View full abstractDownload PDF (11853K)
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