巻号一覧
49 巻, 9 号
選択された号の論文の12件中1～12を表示しています
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奥 久好1980 年 49 巻 9 号 p. 592-595
発行日: 1980/09/05
公開日: 2011/08/05
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広瀬 衞, 小川 芳一1980 年 49 巻 9 号 p. 596-599
発行日: 1980/09/05
公開日: 2011/08/05
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藤城 能教1980 年 49 巻 9 号 p. 600-603
発行日: 1980/09/05
公開日: 2011/08/05
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馬場 善禄, 玉置 年宏1980 年 49 巻 9 号 p. 604-608
発行日: 1980/09/05
公開日: 2011/08/05
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簡易型二値化画像処理装置の応用井上 勝敬1980 年 49 巻 9 号 p. 609-613
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーFeatures of the visual information processing technique were examined for the purpose of detecting automatic control of welding process. The most suitable image processing method for these features was developed by the author. The image of the object is processed and converted into binary data by the processor. The necessary informations are extracted from these binary data. The author calls this pro-cessor the BIP (the Binary Image Processor).
Two examples of the BIP application to on-line detection of welding process are shown in this report.
One example is the detection of wire and joint configurations by direct observation of the arc welding process progressing part. The other is the detection of the fine weld line of butt welding.
The usefulness of the BIP is proved by these examples.抄録全体を表示PDF形式でダウンロード (4076K) -
小林 卓郎, 桑名 武, 木口 立而, 落合 憲一郎, 斉藤 晃一1980 年 49 巻 9 号 p. 614-620
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーGenerally, chemical reaction in metal arc welding will take place in each stage of the following process; stage of droplet at electrode tip, stage of droplet transfer through arc space and stage of molten pool.
In this work, it is aimed to analyze the chemical reactions in the stage of droplet at electrode tip. Using iron-carbon, iron-silicon and iron-manganese electrode wires, loss of carbon, silicon and manganese in the droplet are determined under two metal transfer modes in CO2 arc welding.
The results obtained are summarized as follows;
1) In arc welding under both short-circuiting and globular transfer conditions, C, Si and Mn contents of droplet decrease with increasing the growth time until 0.2-0.3 second. Over that time, appearent loss of alloying elements are a little.
2) Oxygen content of droplet increases with increasing the growth time of droplet until 0.2-0.3 second. The oxygen contents of droplets are mutually related to the loss of the alloying elements of droplets at individual growth time of droplet.
3) Loss of alloying elements in droplet just before the detachment in short-circuiting transfer condition are less than that in globular transfer condition.
4) The consumption rate of C seems to be greater than Mn, Si, in the stage of droplet growth.抄録全体を表示PDF形式でダウンロード (1626K) -
上田 幸雄, 西村 岩夫, 飯山 英明, 千葉 尚道1980 年 49 巻 9 号 p. 621-628
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーLamellar tearing of opening type and root cracking occasionally occur in multipass welded corner joints.
In this paper, initiation and propagation characteristics of these cracks are examined by measurement of acoustic emission (AE) or weld cracking test, and effects of diffusible hydrogen and preheat-interpass temperature on them are investigated. The result of AE measurement reveais well initiation and propagation characteristics of these cracks. Effects of diffusible hydrogen and preheat-interpass temperature are hardly observed on lamellar tearing of opening type which occurs at the position away from the heat-affected zone. The lamellar tearing is initiated and propagated principally by the developement of welding stress and strain. Root cracking in multipass welded corner joints is initiated mainly by these stress and strain.It is propagated under them, being subjected to the influence of diffusible hydrogen and preheat-interpass temperature.抄録全体を表示PDF形式でダウンロード (7914K) -
ビーム特性と炭素鋼板の溶接条件の選定田中 甚吉, 小菅 茂義1980 年 49 巻 9 号 p. 628-636
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーRelationship between welding conditions, bead shapes and occurrence of weld defects was investigated in flat, horizontal and vertical up position electron beam welding of heavy section carbon steel plates. As a result of these investigations, it was confirmed that sound full penetration welds could be made for carbon steels up to 150 mm thickness with proper beam oscillation.
Main results obtained are as follows;
(1) Beam shape at a beam current of above 160 mA is nearly parallel independently of focus coil currert.
Beam diameter is given by the following equation;
db=4.7×10-2(1/If)3.8Ib(mm), for Ib≤160 mA beam current
db=1.4×10-2Ib+1.6(mm), for Ib>160 mA beam current
(2) In flat position, penetration depth is given by the following experimental equation;
hp=2.0⋅Ib/√ub (Ib/√ub>45)
Occurrence of weld defects can be prevented by the application of beam oscillation which results in stabilized metal flow.
(3) In horizontal position, penetration depth is given by the following equation;
hp=2.9⋅Ib0.9/υb0.4
Sound full penetration welds can he obtained up to 150 tnm thick carbon steels without front support bars, when proper back beads are produced. It is observed that there is a marked beneficial effect of beam oscillation on prevention of weld defects.
(4) In vertical up position, sound full penetration welds can be produced in carbon steels up to 75 mm thickness without front support moulds.抄録全体を表示PDF形式でダウンロード (3318K) -
溶接割れからの破壊明石 重雄, 深沢 誠1980 年 49 巻 9 号 p. 636-642
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーBrittle fracture from the weld crack of SM50 steel was investigated and compared with the fractureof base metal with machined notch. Bending COD tests and tensile tests were performed at the temperature where the structure is usually in service. The results are summarized as follows; 1) Bending COD tests show that the base metal with machined notch have a critical COD δc>1 mm attemperature above -50°C, and that the weld joint with crack have δc≤0.2 mm at temperature below -30°C. The notch acuity of weld crack is as same as fatigue pre-crack on the same weld metal.
2) For the base metal, stable crack growth precedes unstable fracture, at which the stress in the remaining uncracked section is greater than yield stress of the material. In this case, the fracture can be estimated by the relation of half length of equivalent through thickness crack, a and overall strain at fracture, e1.
3) For the weld joint, unstable brittle fracture is occured without fibrous crack. In this case, the fracture can be predicted on the safe side by the fracture limiting lines expressed as follows.through thickness crack δc/2πeya=0.56e1/ey surface crack δc/2πeya=e1/ey where δc is COD obtained from bending tests and ey is yield strain of the material.抄録全体を表示PDF形式でダウンロード (2877K) -
Sn入りりん銅ろうについて岡本 郁男, 竹本 正, 安田 冨郎, 服巻 孝1980 年 49 巻 9 号 p. 642-647
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーA new copper phosphorous self-fluxing brazing filler alloy usable at 650°C has been developed by the addition of tin to Cu-Ag-P alloy. The influence of tin and phosphorous content on the brazability at 650°C has been investigated by evaluating the penetration length of filler alloy between two copper plates of 0.1 mm lap joint clearance. Differential thermal analysis and metallographic observation were also carried out to define the temperature ranges of melting and the phase Changes. Within the range of this investigation, the available filler alloy composition was found to be Ag/Cu(15/65)-15%Sn-(3-3.5)%P. The solidus and liquidus temperatures of the alloys were about 475°C and 620-650°C, respectively. The alloys of more than 3.5%P content havingprimary Cu3P phase showed poor penetration length because phosphorous content in coexistingliquid decreased due to the formation of Cu3P. On the other hand, the alloys of less than 3.5%P content crystallized primary Cu(a) phase, and then the coexisting liquid contained more phosphorous than the nominal concentration. Accordingly, the alloys exhibited excellent fluxing action.抄録全体を表示PDF形式でダウンロード (3099K) -
拡散溶接に関す研究(第9報)大橋 修, 橋本 達哉1980 年 49 巻 9 号 p. 647-651
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーTreatment of surface to be welded is one of the most important factor affecting the weld characteristics of diffusion welds. As oxides of silver are dissolved above 230°C, specimens were ion-plated with silver to prevent welded surface from the contamination with oxides. Specimens covered with silver was diffusion welded in atmosphere and vacuum, and the effect of surface treatment by silver plating was investigated. The following results were obtained.
Joints of specimens covered with silver, which are welded below 600°C in atmosphere and vacuum, reveal no difference in weld strength. But tensile strength of joints, which are welded above 700°C in atmopshere, decreases due to the oxide layer formed at interface between silver and base metal.抄録全体を表示PDF形式でダウンロード (1949K) -
13Cr鋳鋼の溶接性(第6報)朝倉 重次, 和知 弘1980 年 49 巻 9 号 p. 652-656
発行日: 1980/09/05
公開日: 2011/08/05
ジャーナル フリーEffects of the conditions of welding procedure on the weld crack sensitivity of 13Cr cast steels were investigated by the tensile restraint cracking (TRC) test and the slit type cracking test, using D 4316 type and D 410 type of coated electrodes. The main results are summarized as follows.
(1) The critical tesile stress for cracking occurence increased with increase of preheating temperature. When 13Cr cast steels and low alloy high tensile steels were compared with, increase in the critical stress of 13Cr cast steels due to the rise of preheating temperature was small. (2) When the holding temperature after welding was higher than 100°C, the critical stress increased. At 150°C holding temperature, a large increase of the critical stress was observed in a relatively short period of holding time.
(3) When 13Cr weld specimens were postheated within the range of 400-600°C, the critical stress was more than 46 kg/mm2 (Fractured in D 4316 weld metal).抄録全体を表示PDF形式でダウンロード (1749K)
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