２１／４Ｃｒ‐１Ｍｏ鋼厚板溶接部の横割れ防止低温溶接後熱処理条件　　低温溶接後熱処理による２１／４Ｃｒ‐１Ｍｏ鋼厚板突合せ溶接部の横割れ防止について　ＩＶ

• 高橋 英司

  (株)神戸製剛所中央研究所

• 岩井 健治

  (株)神戸製剛所中央研究所

• 堀辻 剛

  (株)神戸製剛所中央研究所

書誌事項

タイトル別名

• Conditions of the Low Temperature Postweld Heat Treatment for Preventing the Occurrence of the Transverse Cracks induced in 2 1/4 Cr-1Mo Steel Thick Weldments
• 低温溶接後熱処理によね21/4 Cr-1 Mo鋼厚板突合せ溶接部の横割れ防止について(第4報)

抄録

A series of researches has been conducted in order to establish the procedure of the Low Temperature Postweld Heat Treatment (LTPWHT) superseding the conventional intermediate stress relief annealing, by which the prevention of the transverse weld cracks induced in the thick 2-1/4Cr-1Mo steel weldments by submerged arc welding process can be made possible.<BR>First we found that this kind of crack could be prevented by only reducing hydrogen concentrations in the weld zone. Then, following this result, the relationship between hydrogen concentrations in the weld zone just after welding and the practical welding conditions was investigated, as was described in Report 2. Next, we proceeded to clarify the relation between the reduction of hydrogen concentrations through LTPWHT and its treating conditions in the previous paper.<BR>As the final step of this research, cracking tests were carried out to evaluate the critical hydrogen concentration under which the cracks did not occur at all, by comparing both results of the cracking tests and calculations on the distributions of the hydrogen concentrations obtained in the weld zone under the same conditions as the cracking tests. As a result, it was found that the highest hydrogen concentration had to be reduced to less than 3.3 cc/100 gr after LTPWHT in order to prevent the cracks. Adding this result to the results obtained previously made it possible to determine the appropriate conditions of the LTPWHT for preventing the cracks under a wide variety of the welding conditions, such as plate thickness, groove width, preheat and interpass temperature, and pass interval.<BR>An additional investigation clarified that a newly developed material of the low hydrogen flux had a large effect upon the mitigation of the LTPWHT conditions for preventing the cracks.

収録刊行物

• 溶接学会誌

  溶接学会誌 49 (10), 693-698, 1980

  一般社団法人 溶接学会

キーワード

• Metals and Alloys
• Surfaces, Coatings and Films
• Mechanical Engineering
• Mechanics of Materials

詳細情報

• CRID: 1390001206499091712
• NII論文ID: 130003763524
• DOI: 10.2207/qjjws1943.49.693
• ISSN: 18837204
• ISSN: 00214787
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • Crossref
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可