熔深不足 meaning in English

insufficient penetration

So the shape and the penetration of welding bead will change , result in the lack of the penetration
因此焊缝熔深也发生变动,容易产生熔深不足等缺陷。
The lack of the penetration of welding bead is a typical defect . it will do great harm to the quality and safety of the welding structure
焊缝熔深不足是焊缝及焊接接头内部的一个典型缺陷,会给焊接结构的质量及使用安全带来危害及影响。