弧坑 meaning in English

arc crater
arc pit
crater

External defects : undercut , overip , arc pit , gas cavity in surface , crack in surface
外部缺陷：咬边、焊瘤、弧坑、表面气孔、表面裂纹。
When the welding current is added , on the one hand , the section of arc will more or less increase , so the fusion width will increase ; on the other hand , the depth of arc crater will increase
焊接电流增加时，一方面是电弧截面略有增加，导致熔宽增加，另一方面是电流增加促使弧坑深度增加。
When the welding current is added , the quality of heat of the arc will increase , so both the volume of molten puddle and the depth of arc crater will all increase , and the weld depth will increase when the weld is cooling
焊接电流增加时，电弧的热量增加，因此熔池体积和弧坑深度都随电流增加，所以冷却下来后，焊缝厚度就增加。
Cracking failure of centrifugal compressor ' s impellers was analyzed , the welding craters in the impellers led to stress concentration . the unsteady gas flow accelerated the development of cracks in the impeller
摘要针对某石化公司离心压缩机叶轮多次发生开裂、掉块等故障以及裂纹形成机理进行了分析。分析结果表明了叶轮开裂原因系疲劳开裂，叶轮焊接缺陷产生了焊接弧坑，造成表面应力集中，气流激振加速了裂纹扩展。