Prevention of the Transverse Cracks in Heavy Section Butt Weldments of 2 1/4Cr-1Mo Steel through Low Temperature Postweld Heat Treatment (Report 4) : Conditions of the Low Temperature Postweld Heat Treatment for Preventing the Cracks

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概要

• 論文の詳細を見る

• A series of researches has been conducted in order to establish a 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 weldmenst by submerged arc wedling process can be made possible. 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. 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 about the distribution 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 3.3cc/100gr after LTPWHT in order to prevent the cracks. Considering this result in addition 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. 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.

• 社団法人溶接学会の論文
• 1980-10-01

著者

• Iwai Kenji

  Central Research Laboratory Of Kobe Steel Ltd.

• Takahashi Eiji

  Central Research Laboratory Kobe Steel Co. Ltd.

• HORITSUJI Tsuyoshi

  Central Research Laboratory of Kobe Steel, Ltd.

関連論文

• Multipass Welding Stresses in Very Thick Plates and Their Reduction from Stress Relief Annealing
• A Method of Measuring Triaxial Residual Stress in Heavy Section Butt Weldments
• Transient and Residual Stresses in Multi-Pass Welds
• Prevention of the Transverse Cracks in Heavy Section Butt Weldments of 2 1/4Cr-1Mo Steel through Low Temperature Postweld Heat Treatment (Report 4) : Conditions of the Low Temperature Postweld Heat Treatment for Preventing the Cracks
• Prevention of the Transverse Cracks in Heavy Section Butt Weldments of 2 1/4Cr-1Mo Steel through Low Temperature Postweld Heat Treatment : (Report 3) Correlation between Reduction of Hydrogen Concentration through LTPWHT and Its Treating Conditions
• Prevention of the Transverse Cracks in Heavy Section Butt Weldments of 2 1/4Cr-1Mo Steel through Low Temperature Postweld Heat Treatment : (Report 2) Correlation between Hydrogen Concentration and Practical Welding Conditions
• Prevention of the Transverse Cracks in Heavy Section Butt Weldments of 2 1/4 Cr-1 Mo Steel through Low Temperature Postweld Heat Treatment (Report 1) : Relations between Occurrence, or Prevention of the Cracks and Parameters of Residual Stress and Diffusi

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