Through analysis on inside weld forming and welding procedure of SSAW pipe, it pointed out weld crack is easy to appear in brittle temperature zone in welding pool.
通过对螺旋埋弧焊管内焊缝成型和焊接过程的分析，指出焊缝裂纹易产生在焊接熔池脆性温度区。
The formulae for calculating SIF and fatigue life of surface crack at weld toe of the high-strength steel under the combination stresses were given out.
给出了高强钢焊趾表面裂纹在压弯组合应力下应力强度因子及其疲劳寿命计算式。
A flexible guiding weld dynamic tracking unit is designed out and stable dynamic tracking of ultrasonic continuous automatic inspection is realized.
设计了一种柔性导向焊缝动态跟踪装置，实现了超声波连续自动检测中焊缝的稳定动态跟踪。
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