All issues
Volume 31, Issue 2
Displaying 1-8 of 8 articles from this issue
- |<
- <
- 1
- >
- >|
-
Toshio Ohwa1962 Volume 31 Issue 2 Pages 87-92
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (2125K) -
Shiigeo Inomata, Mamoru Nishihara, Koiti Nakano1962 Volume 31 Issue 2 Pages 93-102
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (5461K) -
Haruyoshi Suzuki, Michio Inagaki, Harumasa Nakamura, Makoto Shimizu1962 Volume 31 Issue 2 Pages 103-110
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSTo study the individual and correlated effects of mechanical and thermal restraints on weld cracking behaviours of steels and electrodes, two types of dynamic cracking testers have been used in the present paper, that is, a Murex type bending cracking tester and a new type tensile cracking tester. In the latter, one piece in a butt weld specimen is tensile and can be displaced at any constant speed against the other stationary piece during or after welding at an arbitrary instant.
Dynamic cracking tests of several mild steel coated electrodes showed that these two testers were satisfactory for classifying cracking susceptibility. Among the tested electrodes, the low hyd-rogen type showed the least, the high titania type the greatest and the high cellulose and illmenite types medium. susceptibility to both hot and cold cracking of weld metal.
Stainless steel coated electrodes could be satisfactorily evaluated with this dynamic cracking tester concerning the suitability for the first pass welding of a clad steel.
Comparing the two cracking test methods, the tensile restraint cracking tester was found to be more sensitive and reproducible than the Murex type bending restraint cracking tester. An instant of weld cracking in the former tester can be determined very successfully by observing a corres-ponding discontinuous change in the tensile load across the test weld. Further studies are being continued with the tensile restraint cracking tester.View full abstractDownload PDF (4403K) -
Michio Inagaki, Toyoaki Bada, Masahiro Uta1962 Volume 31 Issue 2 Pages 111-120
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESS1) Continuous cooling transformation diagrams are constructed for six kinds of HT-60 strength steels, (four normalized steels, two heat-treated steels) by using the new apparatuses which can automatically reproduce any weld thermal cycle (maximum heating temperature 1350°C).
2) The critical cooling time C'f derived from those CCT diagrams, i. e. the critical cooling time with regard to the first emergence of proeutictiod ferrite, is obtaind as follows, steel S6 : 1.8 sec, S5 : 2.9 sec, S1 : 3.2 sec, S3 : 4.2 sec, S2 : 0.8 sec, S4 : 7.4 sec.
3) It should be mentioned that the judgement of weldability with value of C'f is in good accord with the result of other weldability tests, i. e. the hardness test with taper specimen, the bead bend ductility test, the maximum hardness test in H.A.Z. and the synthetic H.A.Z. ductility test,
The value of C'f is considered on important factor of weldability for ductility of weld heat affect zone and weld cracking susceptibility.View full abstractDownload PDF (13661K) -
Study on Necking of ThermoplasticsIwao Ohnishi, Hiroshi Kimura1962 Volume 31 Issue 2 Pages 121-132
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSTo trace the cause of the phenomenon of necking, it is essential to make clear the physical, chemical and mechanical relations in the microstructure of thermoplastics. With a view to clarifying the effects of mechanical properties and microstructure on deformation and fluidity of thermoplastics, and elucidating the necking of plastics materials, a study was made by tension tests, X-ray diffraction tests, and specific viscosity tests, in which X-ray diffraction tests were done with the parent material, specimens welded by various gases, Co60 γ-ray radiated specimens, tests on each tensile fracture, etc., in high pressure polyethylene.View full abstractDownload PDF (17146K) -
Tohru Yoshida, Tokuo Hirose1962 Volume 31 Issue 2 Pages 133-135
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSRecently the tough solders melting at the low temperature are becoming more and more necessary in order to diminish the bad effects on the base metals brazed in high temperature soldering operation.
The authors studied the binary or ternary alloys composed of Cd-Zn and Cd-Zn-Ag. The results obtained are as follows.
Among the binary alloys melting in the range of 250-450°C, the eutectic solder composed of Cd-Zn containing about 17.4% Zn possesses the best toughness and highest strength of all the other alloys. The mechanical properties are influenced adversely by the deviation of Zn% from the eutectic points. Moreover, Ag as the third element is alloyed into the Cd-Zn eutectic solders for the purpose of obtaining the higher strength. The solid solution limit 3% Ag and 6% Ag corresponding to the compound Ag Zn give the best toughness and the highest tensile strength respectively.View full abstractDownload PDF (211K) -
Tadashi Ohtake, Sadayoshi Morita, Susumu Goda, Masao Kanamori, Toshima ...1962 Volume 31 Issue 2 Pages 136-142
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSVarious notch toughness and weldability tests were performed for Si-Mn Y N D steel which was developed as the economical material for low temperature applications. The material was Si-Mn Aluminum-killed steel in the pressure quenched and tempered condition.
The testing results summarized :
1. According to the results of various Charpy impact tests, the notch toughness of the steel is much superior to that of ordinary Aluminum-killed mild steel.
2. The notch toughness of the material is less affected by cold-work, strain aging and reheating at elevated temperatures that of ordinary Aluminum-killed mild steel.
3. According to the tensile double testing results, the steel plate of 12mm thickness has shown that the upper critical temperature for brittle fracture propagation is -52°C under the applied stress of 15 kg/mm2.
4. The welded joint of the steel shows satisfactory tensile strength, ductility and fatigue strength when it is welded with 2.5% Ni electrode.
5. The I. I. W. maximum hardness test, Kommerel test, slit type restricted cracking test and C. T. S. test of the material have shown that the material has as satisfactory weldability as that of ordinary Aluminum-killed mild steel.
6. The notch tensile test at low temperatures was performed to study the characters of the initiation of brittle crack at welded bond, using wide plate test pieces with cruciformly welded joints. The upper limit of temperature for brittle fracture initiation was -110°C, which is low enough for practical use.View full abstractDownload PDF (2214K) -
Masaki Watanabe, Hiroshi Watanabe1962 Volume 31 Issue 2 Pages 143-149
Published: February 25, 1962
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSA stainless clad material very often suffers considerable change of its residual stress distribution near the boundary between the stainless and the mild steel, and the following results was obtained from the analysis of as well as experiments on the accuracy of the surface stress as determined by the completely relaxed method like a drilled-out method, trepanning method, etc. under the above mentioned residual stress condition.
(1) The surface stress of a stainless section almost completely relaxes and shows a true value when the ratio of the thickness of a strainless section to a drilled-out inner diameter is approximately 1/3 or more.
(2) The determined value is less than the true value, when this ratio is less than 1/3, and it suggests that other methods may be applied.View full abstractDownload PDF (422K)
- |<
- <
- 1
- >
- >|