• 1. underbead crack: 焊道下裂纹 | 焊珠底龟裂 | 焊道底裂纹 | 焊道下裂缝
• 2. underbead crack test: 焊道下裂纹试验
• 3. underbead crack susceptibility: 焊道下裂纹敏感性

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