关于超声波焊缝检查的TOFD(飞行时间衍射时间)方法的应用的争论不应忘记20世纪60年代引入的原因。The major advantage at that time had been the better crack detection in comparison to x-ray techniques, especially in view of an increased use of steels and welding technologies with a the presence of diverse cracking phenomena (e.g. cold cracking, transverse cracks etc.).
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