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.

本文首先讨论了控制热影响区冷裂纹产生的一个参数。从插销试验和TRC试验的数据可以看出，应力参数比应变参数对冷裂纹的预测更有用。然而，应力参数是没有有用的数据塔肯试验，这被认为是一个典型的接头在焊接领域使用。这是由于相变影响热影响区的应力。其次，为了降低焊接热影响区的硬度和氢浓度，研究了冷却时间对焊接热循环转变的影响。冷却时间t85是指焊缝金属从800 ° C冷却到500 ° C所需的时间，与硬度有关。冷却时间t150是指焊缝金属从凝固温度到150 ℃的时间，它与焊接热循环后的氢浓度有关。为了避免冷裂纹的产生，根据焊接和施工条件信息，编制了基于预测冷却时间算法的软件。为了检验软件的适用性，进行了实验。结果表明，该软件对防止冷裂纹的产生是可行的.

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。