Study of Algorism for Avoiding Weld Cold Cracking

避免焊缝冷裂纹算法的研究

• 批准号: 01850168
• 负责人: TERASAKI Toshio
• 金额: $ 1.34万
• 依托单位: Kyushu Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research (B).
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01850168/
• 关键词: Welded Joint; Cold Cracking; Predicting System; Heat Affected Zone; Hardness; Hydrogen Content; 予測システム

This paper firstly deals with a parameter dominating cold cracking arising in the heat affected zone (HAZ). From experimental data of Implant and TRC tests, it is clear that stress-parameter is more useful for cold cracking than strain-parameter. However, Stress-parameter was not useful for data of Takken test which is considered to be a typical joint used in welding field. This cause is due to a phase transformation which affects the stress in HAZ. Then, a study of transformation versus cooling time of weld thermal cycle will be important.Second, for decreasing the hardness and the hydrogen concentration in HAZ, cooling times was studied. Cooling time t85, which means time needed cooling down from 800^ﾟC to 500^ﾟC of weld metal, is related to hardness. Cooling time t150, which means time from solidification temperature to 150^ﾟC of weld metal, is connected with hydrogen concentration after weld thermal cycle. For avoiding cold cracking, software based on algorism predicting cooling time from informations of welding and constructing conditions is made. Experiments were carried out for checking whether software is applicable or not. It is shown that software is applicable for avoiding cold cracking.

本文首先讨论热影响区 (HAZ) 中主导冷裂纹的参数，从植入和 TRC 测试的实验数据可以清楚地看出，应力参数比应变参数对冷裂纹更有用。 - 参数对于焊接领域使用的典型接头的 Takken 测试数据没有用处，这是由于相变影响了焊接热影响区的应力。其次，为了降低硬度和HAZ中的氢浓度，研究了冷却时间t85，即焊缝金属从800^ﾟC冷却到500^ﾟC所需的时间。冷却时间t150是指焊缝金属从凝固温度到150^ﾟC的时间，与焊缝热循环后的氢浓度有关，以避免冷。并通过实验验证了该软件是否适用于避免冷裂纹。

项目成果

T.TERASAKI: "Predictive Equation for Cooling Time t_<8/5> of CTS Test Welds" Trans.Japan Welding Society. 21. 123-128 (1990)

T.TERASAKI：“CTS 试验焊缝冷却时间 t_<8/5> 的预测方程”Trans.Japan Welding Society。

寺崎 俊夫: "局部予熱施工における溶接冷却時間の推定" 溶接学会全国大会講演概要. 47. 338-339 (1990)

Toshio Terasaki：“局部预热工作中焊缝冷却时间的估计”全国焊接学会会议上的演讲摘要 47. 338-339 (1990)。

T.TERASAKI: "Predictive Eguation for Cooling Time t_<815> of CTS Test Welds" Trans.Jopan Welding Society. 21. 123-128 (1990)

T.TERASAKI：“CTS 试验焊缝冷却时间 t_<815> 的预测方程”Trans.Jopan 焊接协会。

T. Terasaki: "Predictive Equation for Cooling Time t85 of CTS Test Welds" Trans. Japan Welding Society. Vol. 21. 123-128 (1990)

T. Terasaki：“CTS 测试焊缝冷却时间 t85 的预测方程”Trans。