Can argon arc root welding and manual arc cap welding be substituted with common manual arc welding on seamless steel line pipe below 5mm wall thickness with 9.5Mpa design pressure?是什么意思_Can argon arc root welding and manual arc cap welding be substituted with common manual arc welding on seamless steel line pipe below 5mm wall thickness with 9.5Mpa design pressure?在线翻译_英语_读音_用法_例句