求翻译：为保证焊接质量，管内焊口之前应先用碳弧气刨清除药皮夹渣，露出金属光泽后再行施焊。碳弧气刨施工应遵照《建筑钢结构焊接规程》（JGJ81-91）4.1.16条：碳弧气刨工必须经过培训，合格后方可操作。刨削时应根据钢材的性能和厚度，选择适当的电源极性、碳棒直径和电流。碳弧气刨应采用直流电源，并要求反接电极（即工件接电源负极），为避免产生“夹碳”或“贴渣”等缺陷，除采用合适的刨削速度外，并应使碳棒与工件间具有合适的倾斜角度，见下表。是什么意思？

To ensure the quality of welding, pipe welded joints should be preceded with a carbon arc gouging clear wallet drug residue, the exposed metallic luster after the welding line. Gouging construction should follow the "building steel welding procedures" (JGJ81-91) 4.1.16 of: carbon arc planer must be

In order to guarantee quality, pipe welding welding mouth should be preceded by the carbon arc gas scraped clear medicine wallet Standard Chartered, he exposed metallic Luster after welding. carbon arc gas shaver construction should be in accordance with the building steel structures (JGJ welding St