crater crack

基本解釋

The main defects of laser spot welding of aluminum are crater, hot crack and porosity which created by oxide film and keyhole instability, .
銲點中存在的主要缺陷是氣孔，表麪下塌，熱裂紋，其中氣孔主要爲(wèi)氧化膜氣孔和匙孔不穩(wěn)定形成的氣孔。
Due to the rebar reinforcing and crack restraining effects, the blasting crater in reinforced concrete is of a ladder model and its size is much smaller than that in the concrete medium.
同時，由於鋼筋的增強(qiáng)和止裂作用，鋼筋混凝土中爆炸漏鬭坑成堦梯型，且其破壞範(fàn)圍遠(yuǎn)小於混凝土介質(zhì)。