Fatigue Strength Improvement of Box Welds by Using Low Transformation Temperature Welding Material. Tripled Fatigue Strength by Postweld Heat Treatment.
Fatigue Strength Improvement of Box Welds by Using Low Transformation Temperature Welding Material. Tripled Fatigue Strength by Postweld Heat Treatment.
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使用低转变温度焊接材料提高箱形焊缝的疲劳强度。
DOI：
10.2207/qjjws.19.373
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
T. Kubo
中科院分区：
文献类型：
--
作者：
A. Ohta;O. Watanabe;K. Matsuoka;Y. Maeda;N. Suzuki;T. Kubo
通过使用低转变温度焊丝和焊后热处理 (PWHT)，箱体焊缝的疲劳强度提高了三倍。由于压缩残余应力产生的应力比效应，获得了改进的疲劳强度。含有10质量％Cr和10质量％Ni的低转变温度焊接材料在焊接的最终冷却过程中发生膨胀。焊缝金属的这种膨胀在焊接部件周围引起了残余压应力。在 720°C 下进行 1 小时的焊后热处理，然后在空气中冷却，在三个道次中同时诱导从奥氏体到马氏体的转变。也就是说，在焊接状态下，PWHT的三道焊道的体积膨胀比最后一道焊道的体积膨胀变大，并且可以有效地引起压缩残余应力。
The fatigue strength of box welds was tripled by using low transformation temperature welding wire and postweld heat treatment (PWHT). The improved fatigue strength was obtained due to the stress ratio effect resulting from compressive residual stress. The low transformation temperature welding material which contains 10 mass % Cr and 10 mass % Ni expands during the final cooling process of welding. This expansion of weld metal induced the compressive residual stress around the welded part. The PWHT at 720°C for 1 hour and subsequent cooling in air induced the transformation from austenite to martensite at the same time for three passes. That is, the volume expansion on three passes by PWHT became large compare with that on final pass in as-welded condition, and the compressive residual stress could be induced efficiently.