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Volume 35, Issue 4
Displaying 1-9 of 9 articles from this issue
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Noboru Yamamoto, Kiyoshi Terai1966 Volume 35 Issue 4 Pages 306-316
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSDownload PDF (5827K) -
Shigeru Hayashi1966 Volume 35 Issue 4 Pages 317-324
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
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Isamu Ueda, Masaaki Kawamura1966 Volume 35 Issue 4 Pages 325-329
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSRecently, the problem in sulphide corrosion cracking of the LP gas plants has been studied vigorously in laboratories.
But, the object of this study is related to high strength steels because these are used for constructing the LP gas plants.
It is a familiar fact that Chromium-Molybdenum low alloy steels are superior in sulphide corrosion cracking to other high strength steels.
But, generally it is recognized that Chromium-Molybdenum steels are poor in weldability.
Authors hrve commenced this study to clear this sulphide corrosion cracking of 21/4% Cr-I% Mo weldmetal.
The conclusions of this report are as follows.
1. The embrittlement of this Chromium-Molybdenum steel in the solution of 0. 5% acetic acid saturated by hydrogen sulphide is regarded as the hydrogen-embrittlement.
2. We can recover the majority percentage of this embrittlement by artificial aging in a short period of time.View full abstractDownload PDF (283K) -
Takurõ Kobayashi, Takeshi Kuwana, Yasushi Kikuchi1966 Volume 35 Issue 4 Pages 330-338
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSEffect of the nitrogen partial pressures in the welding atmospheres of several gas mixtures and welding conditions on the nitrogen content and porosity of stainless steel weld metals were studied by using an arc atmosphere controlled chamber.
The results were summarized as follows
1. The nitrogen contents of weld metals decrease with increasing welding current.
2. The anomalous nitrogen absorption into weld metal is observed at low arc atmospheric pressures.
3. The existence of oxidizing gas in arc atmosphere such as oxygen or carbondioxide contributes greatly to the nitrogen absorption into weld metals.
4. In reducing gas atmospheres such as nitrogen-hydrogen mixtures, the nitrogen contents in weld metals show a tendency to obey the square root law.
5. Although some calculations for the nitrogen absorption into weld metals were made using thermo-dynamic data obtained by an equilibrium study, a great difference between the calculated values and experimental values was generally observed.View full abstractDownload PDF (7238K) -
Analysis on the Equilibrium Among Oxygen Gas, Molten Slag FeO-MnO-SiO2 and Molten Fe-Mn-Si-O SystemToshikage Ikkai1966 Volume 35 Issue 4 Pages 339-344
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSAs a sequel to the previous report concerning the equilibrium among oxygen gas, FeO-Fe2O3 CaO-SiO2 slag and Fe-Si-O molten iron, in this report the statistical thermodynamic analysis is made of the equilibrium among oxygen gas, FeO-MnO-SiO2 slag and Fe-Mn-Si-O molten iron. The study of such system is reluted to the deoxydation by the use of Silicon and Manganese. This subject has been so far discussed.
The basic fluxes containing more MnO and CaO are recently put oo sale as a flused flux for the submerged arc welding. It is noted that the mechanical properties, especially the impact properties at low temperature, of the weld metals obtuined with use of these fluxes are fairly good. This repost does not give any definite answer, but it seems to serve as an aid in resear ches on this point.
As FeO-CaO-SiO2 calculated in the previous report is here replaced by FeO-MnO-SiO2 system, and also CaO replaced by MnO, both indicate similar tendency in equilibrium oxygen pressure, the amount reduced of silicon, and oxygen value in molten iron. CaO and MnO, both of which are basic, are considered to be almost similar.
The amounts of CMn, Csi and Co newly determined in the present calculation. In view of this calculation, it is necessary to check whether the common deoxydation by manganese and silicon is more effective than by only silicon. This problem requires further scientific investigations about various constants.View full abstractDownload PDF (357K) -
Experiments on the contraction process of plain carbon steel weldmentsKunihiko Satoh, Shigetomo Matsui, Masahiro Kobayashi1966 Volume 35 Issue 4 Pages 345-352
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSMeasurements of contraction process during first-pass welding and cooling were undertaken and the results compared with the analytical results in Part 1. Mild steel specimens of 5 through 150 mm thick as shown in Fig. 1 were used. Contraction during welding and cooling was recorded by oscillograph over five gauge lengths AA', BB', CC', DD' and EE' in Fig.2. Thermal cycles were also recorded at a few points in weld metal and mother plate. Figs. 4 through 6 show typical examples of the test results. Their characteristics almost agree with those predicted by analytical approach shown in Fig. 7. Some analyses showed good agreement between test results and calculations. (See Figs. 8 through 11.) However a little difference between them was attributed to the effect of moving of welding heat source which was neglected in the analysis.View full abstractDownload PDF (492K) -
Isao Masumoto, Kazuo Matsuda1966 Volume 35 Issue 4 Pages 353-362
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThe purpose of this research is to investigate the effect of the deoxidizing elements of the electrode wire on the water vapour welding of steel. The experimental results were as follows :
1) Tensile strength of a joint by the water vapour welding was high enough as compared with base metal, but its ductility was not so great. The welding was performed under welding conditions of both globular and dip transfer.
2) The effect of the electrode wire containing deoxidizing elements was recognized by the mechanical test of an each-side one-pass welded joint, but it could not be confirmed about the multi-pass all-weld metal obtained using various electrode wires.
3) The degree of oxidation of water vapour atmosphere was greater than that of carbon deoxide atmosphere. But there was no relationship between the occurrence of the blow holes in a weld metal and the content of the deoxidizing elements in steel electrode wire.
4) Diffusible hydrogen content of a weld metal obtained by water vapour welding was 15.5-28.5 cc/100 g depending on welding current.View full abstractDownload PDF (4642K) -
Takeharu Watanabe1966 Volume 35 Issue 4 Pages 363-374
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSThe process is successfully applied in field to join Tee-branch of gas pipe to be laid underground.
In this report, the author studies the exothermic material, operating condition and mechanical properties of the brazed Tee joint with the following conclusion:
1) The exothermic material is based on thermit mixture, chiefly composed of aluminum powder and partially of metal oxides, refractory materials and binder, and accordingly the oxygen quantity necessiated for thermit reaction is not sufficient unless it is supplemented by the oxygen in air.
thus, the exothermic material does not produce metal as normal thermit mixture does after burning, and it retains its original geometry, although its active constituents are consumed to generate heat enough to complete a brazed Tee joint of pipe.
2) According to factorial experiment, mechanical and chemical treatments of joining surface, condition of flux, and kind of filler metal have comparatively large effect on mechanical properties of Tee joint of pipe.
It is, therefore, necessary for a sound brazed Tee joint to select the above factors properly.
3) Standard thermit brazed Tee joint has mechanical properties required for Tee joint of pipe and is rather superior to malleable cast iron Tee pipe, and similar to conventional welded joints.
4) As thermit brazed joint is a joint of dissimilar metals, corrosion of joint must be considered. But, tension test of the joint laid in corrosive media for 180 days shows no change in tensile strength.View full abstractDownload PDF (2318K) -
Minoru Okada, Shigeo Shin1966 Volume 35 Issue 4 Pages 375-388
Published: April 25, 1966
Released on J-STAGE: August 05, 2011
JOURNAL FREE ACCESSButt welding of titanium clad steel can't so easily be done as an arc welding of stainless clad steel, because brittle metallic compounds which consist of titanium and various alloying elements contained in carbon steel formed at the welded zone.
Then, for the butt welding of titanium clad steel, the following method is considered the most suitable. Namely after taking off titanium at the part to be joined, the carbon steels are butt welded and then titanium lining is done at the part where titanium has been taken off.
Although various lining methods are available for titanium lining of carbon steel, the authors have carried out some studies about titanium lining by Tig. spot welding.
Inserting the double insert metals, metals (such as Ta, Nb, Mo, V etc.) which do not form brittle metallic compounds with titanium and silver or silver-solder, between titanium and carbon steel, a considerably good titanium lining was obtained by Tig. spot welding.View full abstractDownload PDF (14268K)
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