巻号一覧
42 巻, 12 号
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迎 静雄, 加藤 光昭1973 年 42 巻 12 号 p. 1170-1179
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーIn the weld metal, generally, subgrains are developed inside of columnar crystals or equiaxed dendrites and solutes segregate along boundaries of the subgrains. Accordingly, the content of the solutes dissolved in the weld metal would change when the subgrains are developed in the weld metal. The change of magnesium content dissolved in the weld metal of aluminum-magnesium alloy was investigated with X-ray diffraction technique. The main conclusions obtained are as follows;
(1) Magnesium content dissolved in the weld metal decreased gradually as the growth proceeded from the fusion boundary to the weld center.
(2) When the weld heat input increased the magnesium content dissolved in the weld metal decreased.
(3) The magnesium segregated along boundaries of the subgrains.
(4) After heat treating the weld metal for 24 hr at 550°C the magnesium which had been segregated along boundaries of the subgrains dissolved again in aluminum matrix and the magnesium content dissolved in the weld metal became almost the same as one in the base metal.抄録全体を表示PDF形式でダウンロード (8525K) -
木原 博, 岡本 郁男, 飯田 孝道1973 年 42 巻 12 号 p. 1180-1186
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーBy use of basic physical quantities from the practical standpoint, a trial has been made in formulating relationships in viscosity-diffusivity and viscosity-surface tension of molten metals at or near the melting point.
Using the expressions, which have been drived by authors from the theoretical standpoint, the relationships in viscosity (ηm), diffusivity (Dm), and surface tension (γm) of molten metals at or near the melting point can be expressed with such basic physical quantities as atomic weight (M), melting point (Tm) and atomic volume(Vm) as follows:
Dm=3.5×10-6(Tm/M)1/2Vm1/3(From the modified Stokes-Einstein.)
rm/ηm=7.0×103(Tm/M)1/2
rmDm=1.4×10-5Tm3/2/Vm1/3M1/2andrm/ηmDm=2.0×109Vm-1/3 ≈ 109抄録全体を表示PDF形式でダウンロード (484K) -
エレクトロスラッグ溶着金属と水素添加溶着金属の異常破面について西尾 安弘, 吉田 康之, 岡本 善一郎, 三浦 譲1973 年 42 巻 12 号 p. 1187-1193
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーStrange silver white spots appeared in fracture sufrace of tensile test specimen of C.E.S. weld metal and hydrogen charged weld metal.
We studied on this phenomenon s are the results obtained are as follows.
(1) Those silver white spots are micro weld cracking and fish eye.
(2) Micro weld cracking includes small columnar structure and fish eye do not include columnar structure.
(3) Micro weld cracking is similar to so called "Ice flower structure.
(4) Weld cracking in the C.E.S. weldment has been considered as a hot crack, but that is a cold cracking induced by hydrogen.抄録全体を表示PDF形式でダウンロード (8043K) -
Fe-S-Mn 3元系合金の溶接金属に形成する硫化物に関する基礎的検討仙田 富男, 松田 福久, 中川 博二, 渡辺 潔, 松坂 矯1973 年 42 巻 12 号 p. 1194-1203
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーSulphides formed in TIG-arc weld metals of Fe-S-Mn ternary alloys and the solidification, crack susceptibility have been investigated. At the same time the applicability of the law of coincidence for change in liquid compositions during non-equilibrium solidification has been examined. Main conclusions obtained are as follows:
1) The shape and structure of sulphides and the crack susceptibility of weld metal can be classified by Mn3/S ratio which was expected by the law of coincidence.
2) In the weld metal whose Mn3/S is less than about 0.83, sulphide is composed of FeS and (Mn, Fe)S. Its shape is filmlike at the columnar grain boundary and globular at the cell or cellular dendrite boundary. Moreover solidification crack always occurs along the filmilike sulphide.
3) In the weld metal whose Mn3/S is bteween 0.83 and about 3, only (Mn, Fe)S is generally formed, whose shape at the columnar grain boundary is still filmlike. Solidification crack also occurs along the filmlike sulphide in high welding speed.
4) In the weld metal whose Mn3/S is more than about 3, obvious eutectic composed of iron and small (Mn, Fe)S of granular shape is formed at both the columnar grain boundary and the cell or cellular dendrite boundary. In this weld metal solidification crack does not occur.抄録全体を表示PDF形式でダウンロード (9777K) -
耐食性75Ni-15Cr-Fe合金の溶接熱影響部割れの冶金学的解明とそれの防止法小泉 勇1973 年 42 巻 12 号 p. 1204-1209
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーThe studies in this report were carried out to clarify the effect of Mg on the hot ductility of 75 Ni-15 Cr-Fe alloy and to investigate the relation between the existence of Ni2Mg and (Ni2Mg+Ni) and HAZ cracking.
The results are summarized below:
1. Increasing content of Mg, hot ductility of 75 Ni-15 Cr-Fe alloy becomes worse and grain boundary breaking occures remarkably.
2. The existence of Ni2Mg and (Ni2Mg+Ni) is thought to be the cause of HAZ cracking in 75 Ni-15 Cr-Fe alloy.
3. HAZ cracking of 75 Ni-15 Cr-Fe alloy can be prevented by means of solid solution treatment for Mg.抄録全体を表示PDF形式でダウンロード (3874K) -
奥村 敏恵, 高橋 光雄, 坪井 潤一郎, 平井 征夫1973 年 42 巻 12 号 p. 1210-1222
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリー水圧鉄管などの高湿度下の溶接で問題となる割れの防止のために,溶接材料管理と溶接法について検討し,さらにこの割れに対する拘束度と拡散性水素量の影響を比較して以下の結論を得た.
(1)高湿度下での溶接棒被覆剤の吸湿はおもにそのバインダと被覆剤内部の種々の細孔への吸着現象に支配されており,吸湿量vは平衡吸湿量veおよび定数α'を用いて,v=ve(1-e-αt')の形で整理できる.
(2)被覆剤の吸湿は水蒸気分圧だけでなく温度の影響が大きい物理吸着で,相対湿度が約60%以上になると急激に吸湿量が増加する.
(3)高湿度下では,とくに大気中水蒸気のまきこみによる溶接金属の拡散性水素量の増加が大きく,それはMIG,サブマージアーク,被覆アーク溶接の順に多くなるから,高湿度下の溶接にはMIG溶接が最適と考えられる.
(4)MIG溶接金属の拡散性水素量は,ワイヤ中の水素の寄与が大気中水蒸気によるそれより大きい.
(5)アーク雰囲気において水素分圧と水蒸気分圧が同じならば,溶接金属の拡散性水素量もほとんど同じとなり,またシールドガス中のCO2量が増加すると拡散牲水素量も多くなる.
(6)HT-80鋼の割れ感受性は拘束度よりも拡散性水素量により影響されやすく,この点からも高湿度下の溶接法としてMIG溶接が適している.
(7)HT-80鋼溶接継手のルート割れは,おもにルート部のtransition zoneから発生するので割れ感受性に対する溶接金属の化学成分の影響が大きい.
(8)HT-80鋼とそのMIG溶接金属の高湿割れ感受性はかなり高く,高湿度下の溶接ではこれらミクロ割れの水素によるマクロ割れへの成長が予想できるので,微小欠陥の防止に留意しなければならない.抄録全体を表示PDF形式でダウンロード (4342K) -
益本 功, 松田 一夫, 長谷川 正義1973 年 42 巻 12 号 p. 1223-1236
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーThe experiment on galvanized steel plate was carried out by manual welding with various types of electrodes and automatic gas-shielded metal-arc welding.
The experimental results were as follows:
1) Good-appearance beads and sound welded joints were obtained by ilmenite, lime-titania and high titanium oxide type electrodes. Appearances of beads by high cellulose and low hydrogen type electrodes were good, but blowholes or slag inclusion in weld metals were observed by the X-ray.
On the other hand, good appearances and sound welded joints were obtained by CO2, CO2-O2, Ar-CO2 or Ar-O2 shielded-gas metal-arc welding.
2) Sound welded joints were satisfactory in tensile strength and ductility in comparison with the base metals. Zinc content of weld metal showed no detrimental effect on its mechanical properties.
3) Zinc content of weld metal was the highest by low hydrogen type electrode (0.054%) and it was the lowest by high cellulose type electrode (0.025%).
On the other hand, zinc content of weld metal was the highest by CO2-O2 shielding gas (0.037% and 0.044% ) and the lowest by Ar-O2 shielding gas (0.010% and 0.024%) in the case of high current, high voltage condition and short circuit transfer condition, respectively.
4) Amount of fume of the galvanized steel plate about 2 times as much as that of the not galvanized steel plate in the case of coated electrodes and it was several times with gas-shielded metal-arc welding, especially it was the highest by CO2-O2 shielding gas.
And so, it seems that the arc welding of galvanized steel plate has no special difficulty with the precaution of ventilation.抄録全体を表示PDF形式でダウンロード (9140K) -
福井 利安, 難波 圭三, 杉山 禎彦1973 年 42 巻 12 号 p. 1237-1244
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーExperiments were conducted to study the structural features of weld-solidified metal in commercial 5083 aluminum alloy and its influence on the fracture behaviors.
The shape of weld bead was considerably influenced by welding variables and heat input. In these behaviors, height of reinforcement was influenced by the heat input but depth of penetration was done mainly by the welding current, while width of bead depended on the both of them.
Structures of common 5083 alloy welds containing no refining elements consisted of fine columnar, coarse columnar, granular and feather grains. In these structures, the volume fractions of fine columnar and feather grains were increased with heat input but those of coarse columnar and granular grains were decreased reversely. The width of columnar grain had a tendency to increase with heat input. On the other hand, 5083 alloy welds containing small amounts of Ti-B showed the fine granular structure all over the fusion zone.
When weld metals having fine columnar, coarse columnar and granular grains were stretched, crack occurred preferentially at the grain boundary of coarse columnar structure. In weld metals having taining feather grains, however, it was important to consider the relationship between the growth direction of feather grain and the stretching direction. Crack occurred preferentially at feather grain when stretched transversely to growth direction of feather grain but it did not occur in this way when stretched parallelly.抄録全体を表示PDF形式でダウンロード (6654K) -
試料採取法の比較小林 卓郎, 桑名 武, 菊地 靖志, 山口 忠政1973 年 42 巻 12 号 p. 1245-1251
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーEffect of welding current and sampling method on the nitrogen content of weld metals in nitrogen and air atmospheres using a pure iron electrode wire was studied.
Three methods i.e. depositing on a mild steel plate, rotating copper disk and water cooled copper block were used for sampling at different current levels.
The main results obtained are summarized as follows;
1. The nitrogen content of weld metals obtained by the bead on mild steel plate method decreases slightly in a nitrogen atmosphere but largely in an air atmosphere with increasing welding current.
2. The rotating copper disk method is not suitable for the study of nitrogen absorption as the weld metal droplets are not so rapidly chilled in water bath and the arc condition is pretty different from that of the conventional arc welding.
3. The water cooled copper block method is more suitable than the rotating copper disk method for studying nitrogen absorption through arc space, though it can not be used at the ionhigher currents.
4. The head on plate method is useful for studying the absorption of nitrogen by molten droplets and weld pool at low welding current.抄録全体を表示PDF形式でダウンロード (3062K) -
稲垣 博巳, 石崎 敬三1973 年 42 巻 12 号 p. 1252-1264
発行日: 1973/12/25
公開日: 2011/08/05
ジャーナル フリーPDF形式でダウンロード (14810K)
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