絞り込み

16645

広告

新型ウイルス 封鎖から1か月 先行きの見えない街 中国 武漢 (NHK)

新型コロナウイルスの感染が広がっている中国で状況が最も深刻な湖北省武漢では、事実上、街が封鎖される措置がとられてから23日で1か月になります。住民は外出を厳しく...

  1. クルーズ船対応の医師や看護師は検査対象外...
  2. [企業] DBV社のピーナツアレルギー貼...
  3. 下船後の感染初確認 健康状態把握続ける ...
  4. 白亜紀末の生物大量絶滅は巨大隕石落下直後...

ニュース一覧

Prediction of the Weld Pool Stability by Material Flow Behavior of the Perforated Weld Pool.

著者 Lang R , Han Y , Bai X , Hong H
Materials (Basel).2020 Jan 09 ; 13(2):.
この記事をPubMed上で見るPubMedで表示
この記事をGoogle翻訳上で見る Google翻訳で開く

スターを付ける スターを付ける     (1view , 0users)

Full Text Sources

This article presents the application of a computational fluid dynamics (CFD) finite volume method (FVM) model for a thermo-mechanical coupling simulation of the weld pool used in variable polarity plasma arc welding (VPPAW). Based on the mechanism of the additional pressure produced through self-magnetic arc compression and the jet generated from mechanical plasma arc compression, and considering the influence of arc height and keyhole secondary compression on arc pressure, a three-dimensional transient model of variable polarity plasma arc (VPPA) arc pressure was established. The material flow behaviors of the perforated weld pools were studied. The results show that three kinds of flow behavior existed in the perforation weld pools and it is feasible to predict the weld pool stability by the material flow behaviors of the perforated weld pools. The weld pools can exist stably if the material flow in the bottom of the perforated weld pools can form confluences with moderate flow velocities of 0.45 m/s, 0.55 m/s and 0.60 m/s. The weld pools were cut when the material flowed downward and outward with the maximum velocity of 0.70 m/s, 0.80 m/s. When the maximum material flow velocity was 0.40 m/s, the weld pool collapsed downward under the action of larger gravity. The thermo-mechanical coupling model was verified by the comparison of the simulation and experimental results.
PMID: 31936577 [PubMed]
印刷用ページを開く Endnote用テキストダウンロード