冲天炉热风炉胆结构最薄弱、工作条件最恶劣之处,是其下部内圈角接环形焊缝 A 处(见图)。这里温度高、温差大,经受反复的热胀冷缩作用,致使焊缝开裂引起漏风。即使新装热风炉胆的工作寿命,一般也不恶劣之处,是其下部内圈角 Cupola hot air oven is the weakest structure of the gall bladder, the worst working conditions of the lower inner ring is connected to the annular weld A (see Figure). High temperature here, the temperature difference, subject to repeated thermal expansion and contraction, resulting in weld cracking caused by air leakage. Even if the working life of the newly installed hot blast furnace is generally not bad, is its lower inner ring angle