書誌事項
- タイトル別名
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- Temperature Characteristics of the Droplet Detaching from the Wire Tip in MIG Welding
- 抵拡発熱の溶滴保有熱量におよぼす影響
- Effect of the Joule's Preheating
抄録
Heat content of the droplet detaching from the wire tip in MIG arc welding is measured calorimetrically under a special electrodes arrangement shown in Fig. 1, 2.<BR>Ozawa already reported on this problem and we tested further to understand the temperature characteristics for wires of low and high conductivities.<BR>Fig. 4 shows the results for copper and aluminum wires and Fig. 6 those for steel and stainless steel wires. For aluminum wire, the heat content Qm expressed in cal/g increases as the current is increased in globular transfer range and reaches a nearly constant high value. The temperature is estimated to be nearly equal to the boiling point for the spray transfer range.<BR>The characteristic curve of Qm-I under a constant wire extension for steel or stainless steel wire (Fig. 6) is shown in Fig. 7. Qm increases as the current I is increased for globular transfer range, AB, which is similar to that of aluminum shown in Fig. 8. After reaching a maximum value, Qm decreases for further current increase (curve BCD).<BR>The decrease of Qm is related to the pencil-like forming of the wire tip, which is the well-known characteristic for wires of low thermal and electric conductivities, and this suggests that the droplet can detach more easily when the wire tip takes the pencil-like form. Qm-I curves in Fig. 6(a) can be explained clearly from the above mentioned idea. Fig. 8 shows a Qm-I curve for aluminum wire for an extraordinarily long wire extension, and the curve shows the same tendency as that of steel wire.<BR>Now we understand that the droplet temperature decreases to as low as the melting point of the wire material when the wire is preheated sufficiently by joule's loss, and it rises to as high as the boiling point when the joule's heating is negligible and the wire is heated abruptly by arc of sufficiently large current density.<BR>Figs. 9, 11 show the equivalent melting voltage calculated from Qm and the specific melting rate m (mg/Amp⋅sec) shown in Figs. 4-8. From these figures we can clearly estimate the joule's heating and the anode heating.
収録刊行物
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- 溶接学会誌
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溶接学会誌 36 (10), 1117-1124, 1967
一般社団法人 溶接学会
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詳細情報 詳細情報について
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- CRID
- 1390001206499227264
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- NII論文ID
- 130003762992
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- ISSN
- 18837204
- 00214787
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可