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金属学报  1978 

低合金高强度钢焊接热影响区微裂纹的研究

, PP. 383-467

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Abstract:

低合金高强度钢焊接热影响区微裂纹一般集中于多层焊缝盖面焊道熔合线的凹入处,距钢板表面3—7毫米,而与熔合线取向基本垂直。熔合线凹入处的局部条件直接影响微裂纹的形成。实验证明,熔池凹度d是这些局部不利条件的综合表征。在基体金属固定不变的情况下,裂纹率主要随熔池凹度d的增大而提高,焊接单位能只表现出间接的影响。采用微裂纹不敏感的工艺规范和利用焊丝侧向倾斜角度等工艺措施可以有效地降低或消除热影响区微裂纹。

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