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Volume 36, Issue 9
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A Theory for the solidification of weld metal of a rectangular shapeKunihiko Satoh1967 Volume 36 Issue 9 Pages 952-961
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
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Kinsaku Nakane1967 Volume 36 Issue 9 Pages 962-973
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
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Fukuhisa Matsuda1967 Volume 36 Issue 9 Pages 973-986
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
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Tsuguyasu Wada1967 Volume 36 Issue 9 Pages 986-993
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
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Yoshinori Ito, Hiroshi Iwanaga1967 Volume 36 Issue 9 Pages 994-1002
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThe most important problem in welding high strength steels is weld cracking sensitivity in the heat affected zone.
The weld cracking is said to be caused by the diffusible hydrogen in the weld metal, metallurgical hardening effect and restraining forces.
In this study the effects of alloying elements on some weldability tests and mechanical properties were investigated by the use of design of experiment.
The conducted weldability tests were y-slit type weld cracking test, TRC-test (tensile restraint cracking test) and maximum hardness test.
The test results are summarized below. 1) The alloying elements which affected the y-slit type cracking test results were found to be C, Mn, Cr and B.
There was remarkable interaction between the effect of C and that of Mn, i.e. the increase of C content raised the injurious effect of Mn and the same thing could be said about the case of Mn.
The weld cracking sensitivity was affected by C and Mn substantially.
2) From the result of TRC-test, it was found that the critical stress, cc, was lowered by C, Mn, Mo, Cr and Ni. The effect of C was much greater'than those of the other alloying elements.
Certain correlation could be seen between the y-slit type cracking test results and the critical stresses.
3) The maximum hardness of weld heat affected zone was raised by almost all the alloying elements. But these effects had the tendency to saturate in the upper range.
There was little correlation between the cracking sensitivity and maximum hardness.
4) The tensile strength was raised by Mo substantially.
There was certain interaction between the effect of C and that of Mn in the Charpy transition temperature.View full abstractDownload PDF (1757K) -
Effects of Non-metallic Inclusions on Impact Values of Weld Metals of a Rimmed SteelIsao Masumoto, Koreaki Tamaki1967 Volume 36 Issue 9 Pages 1003-1009
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn the previous report, it was deduced that the non-metallic inclusions of an electrode wire affected the impact value of weld metal. The impact value of weld metal first increased and then decreased in some cases, but in other cases simply decreased with an increase of oxygen content in supplied gas for CO2-O2 arc welding. This result may be also attributed to the compositions or inclusions of electrode wires. The object of this paper is to clarify these points by some experiments.
A rimmed steel was welded with various electrode wires by CO2-O2 arc welding process. Some methods for the determining of inclusions were experimentally compared and discussed. And microscopic measurement and electrolytic isolation were carried out to determine the inclusions in electrode wires and weld metals.
The results obtained are as follows;
(1) It was experimentally concluded that the amounts of inclusions of electrode wires affect those of weld metals.
(2) The impact values of weld metals obtained by electrode wires containing small amounts of inclusions first increased and then decreased in a range of oxygen content of 10 to 25%.
(3) In this case, the amounts of inclusions of the weld metals were generally small and were not changed remarkably by addition of oxygen to supplied gas.
(4) But if the electrode wire contained a large amount of inclusions, the impact value of the weld metal simply decreased and the amount of inclusions of weld metal increased with an increase of oxygen content in supplied gas.View full abstractDownload PDF (3195K) -
Jitsuhiko Ueda, Setsuji Minehisa, Hizô Gô, Kô Nishim ...1967 Volume 36 Issue 9 Pages 1010-1014
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSPlates of an Al-Zn-Mg alloy were welded using an Al-Mg alloy filler rod-wire. The age and work hardening behavior of the welded joint was investigated by hardness test and microscopic observation. The results obtained are summarized as follows.
(1) Softened zone caused by weld-heat was about 40 mm in width. Immediately after welding, hardnesses of deposited metal and H.A.Z. were 70 and 90 V.H.N. respectively. Hardnesses of deposited metal and heat affected zone were both increased by room temperature aging. The hardening rate depended on distance from the center of weld. Hsrdness on deposited metal reached 95 VHN and, on heat affected zone, 110 VHN after 2 months aging.
(2) Age hardening rate at 80°and 110°C was great and over aging phenomena occurred rapidly.
(3) From the relationship between hardness and aging time it was found that there was remarkable difference in hardening rate between deposited metal and heat affected zone at 80°C ageing. Hardness of deposited metal was always less than that of heat affected zone at 110°C aging.
(4) Work hardening of the center of deposited metal was obtainable by working the weld-reinforcement. Hardness of deposited metal increased to the hardness as that of heat affected zone by 25% working after room temperature aging.View full abstractDownload PDF (3762K) -
Effect of Cold Working (Part 1)Masaki Watanabe, Yoshihiko Mukai, Yoshiaki Sone1967 Volume 36 Issue 9 Pages 1015-1023
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSWe investigated the effects of cold working on the stress corrosion cracking of austenitic stainless steels in the boiling solution of 42% MgCl2.
In the case of an 18-8 stainless steel which is transformed partially into quasi-martensite by cold working, both induction period and crack propagation time are changed by cold working. Especially, the crack propagation time is very much lengthened by heavy cold working.
But in the case of other stainless steels, both induction period and crack propagation time are hardly changed by cold working.
As a result of the quasi-martensite obstructing the advance of crack, the crack propagation time is lengthened. And this effect is generally called "keying effect".
The electro-chemical potential of test piece indicated at the crack-initiation time is a little changed by cold working. When the test piece is cold worked lightly such as 7% or 15%, it indicates a slightly lower potential than the original test piece. But when the test piece is cold worked heavily such as 30% or 45%, it indicates a slightly higher potential than the original one.
The slip bands occurring at the time of cold working are never attacked during the stress corrosion test, but the slip bands occurring in the MgCl2 solution by the applied test load are gradually attacked during the stress corrosion test. When a slip band occurs, its fault plane has not any protective film, If this unprotected fault plane appears in the MgCl2 solution, it is attacked. But if it appears in the atmosphere, its area is suddenly oxidized and goes into passive state.
The higher the applied stress is, the more of cracks appear on the surface of tested specimen. When the test piece is cold worked, this relation is shifted toward upward stress followed by the rising of yield point.View full abstractDownload PDF (5851K) -
The Effect of U-and V-notches on the Hydrogen Embrittlement of SteelsIwao Onishi, Yoneo Kikuta, Takao Araki, Eitaro Kakimoto1967 Volume 36 Issue 9 Pages 1024-1034
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSIn the previous paper, authors reported on the hydrogen embrittlement of several kinds of commercial steels in the constant load rupture test.
In this paper, authors report on the effect of U- and V-notches on the hydrogen embrittlement of steels; mild steel, HT-60 steel, HT-80 steel and the weld joint of HT-60 steel, in the C.L.R. test. Hydrogen was charged into steel specimen cathodically under given constant load.
The results obtained are summarized as follows;
(1) The sensitivity of hydrogen embrittlement of steels is affected by the shape of notches, and steels having a severe notch are subject to more remarkable embrittlement than ones having a relatively dull notch.
(2) The fracture of the specimens with the notched part insulated occurs after longer loading period than the case of notched specimens directly charged, under the same stress.
(3) From the results on the weld joint specimens, it was known that hydrogen exerts a serious influence upon the weld part and bonding part.View full abstractDownload PDF (7351K) -
1967 Volume 36 Issue 9 Pages 1040-1057
Published: September 25, 1967
Released on J-STAGE: August 05, 2011
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